Ошибка 404 при запуске tomcat - Ремонт и установка крупной бытовой техники

I downloaded Apache Tomcat 6.0.2
And created a new server in Eclipse

New -> Server
Select «Tomcat v6.0 Server», Next
Tomcat Installation Directory -> Where I unzipped Apache Tomcat 6.0.2
Finish

Then I start the server and go to http://localhost:8080/ to see if it works. And I get a 404 error.

I’ve already googled it and tried to find a solution. But none of those remedies seem to work.

Any thoughts on what the problem is?

Stu Thompson

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asked Jul 22, 2009 at 6:57

From the top of my head, I thought Eclipse started the tomcat server without anything in it, i.e. no web applications. You have to ‘run’ or actually deploy something in that Eclipse Tomcat server so you won’t get the 404s.

The fact that you do get 404 error messages indicates that Tomcat actually IS running. If you shut it down from Eclipse, you won’t get those 404’s anymore

answered Jul 22, 2009 at 7:10

If your wanting to see your Tomcat Server Homepage then you will need to specify the server path and deploy path. The default is set to Use workspace metadata (does not modify your Tomcat installation).

How to do it.

Firstly open the Server’s view in Eclipse. (Window >> Show View >> Servers).
Double click on your Tomcat Server to open the Server Overview.
Then set the Server Locations to Use Tomcat installation (takes control of Tomcat installation). Save the changes.
Restart your Server and then go to localhost:8080. This should open the Apache Tomcat Homepage for your server.

Hope this helps!

answered Apr 14, 2012 at 20:46

Shane DoyleShane Doyle

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The error 404 appears when Tomcat can’t find the localhost.ser file.
In order to get rid of this follow these steps:
1) In Eclipse, right click on server —> Properties —> Click Switch Location —> Apply—>Ok
(This will switch the [workspace metadata] location to the installed Tomcat location.)
2) Then go back to server, double click it. This will open Overview tab. Under this tab goto —>Server Location —> Select Use Tomcat Installation combo box.

Now close it, save it and try run your server and then rerun the URL.

answered May 1, 2012 at 20:20

SonuSonu

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I agree to drvdijk.

Go to «Servers» window, then select your Tomcat instance. Double.click here you will see the «overview» window. Here you can click on «Open launch configuration» to see your Tomcat arguments («Arguments» tab).

Look for the system property «-Dwtp.deploy». This directory is where your Tomcat is looking for installed web applications, i think you don’t have ROOT.war application here. Isn’t it?

Hope this will help you

answered Jul 22, 2009 at 7:35

sourcerebelssourcerebels

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answered Jul 24, 2009 at 15:23

The problem is just as drvdijk mentioned, in order to run a webapp on tomcat from eclipse, it needs to be «deployed» to it. This can be done by right clicking the tomcat server -> add and remove

Alternatively, you can try to startup your tomcat server outside of eclipse. Go to your command line and type

  $CATALINA_HOMEbinstartup.bat          (Windows)

  $CATALINA_HOME/bin/startup.sh           (Unix)

Where $catalina_home is the directory of where you installed tomcat

answered Jan 8, 2012 at 23:41

kumikodakumikoda

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Launch your eclipse Run as administration:
For that right click on eclipse——> run as administration.
It works.

If it not works then again do same and then follow these steps:

In Eclipse, right click on server —> Properties —> Click Switch
Location —> Apply—>Ok
(This will switch the [workspace metadata]
location to the installed Tomcat location.)

Then go back to server, double click it. This will open Overview
tab. Under this tab goto —>Server Location —> Select Use Tomcat
Installation combo box.

Now close it, save it and try run your server and then rerun the URL.

Panther

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answered Dec 16, 2016 at 9:55

1- double click on server
2- Make Sure You have switched correctly the directory for tomcat here

Before

enter image description here

After Fix
enter image description here

3- And Even if you do #2 above you may need do this here as well !

Again here !

enter image description here

answered Dec 19, 2017 at 20:20

shareefshareef

9,19513 gold badges58 silver badges89 bronze badges

Also, notice if you have a duplicated WEB-INF in your path. Sometimes after update a maven project you may have this issue and Tomcat points to an empty folder.

Try to use Tomcat 9 Instead of Tomcat 10

Applications that run on Tomcat 9 and earlier will not run on Tomcat 10 without changes. Java EE based applications designed for Tomcat 9 and earlier may be placed in the $CATALINA_BASE/webapps-javaee directory and Tomcat will automatically convert them to Jakarta EE and copy them to the webapps directory. This conversion is performed using the Apache Tomcat migration tool for Jakarta EE tool which is also available as a separate download for off-line use.

Eric Aya

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answered Jul 6, 2022 at 18:04

стасевичстасевич

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Источник

I downloaded Apache Tomcat 6.0.2
And created a new server in Eclipse

New -> Server
Select «Tomcat v6.0 Server», Next
Tomcat Installation Directory -> Where I unzipped Apache Tomcat 6.0.2
Finish

Then I start the server and go to http://localhost:8080/ to see if it works. And I get a 404 error.

I’ve already googled it and tried to find a solution. But none of those remedies seem to work.

Any thoughts on what the problem is?

Stu Thompson

38.3k19 gold badges108 silver badges156 bronze badges

asked Jul 22, 2009 at 6:57

The fact that you do get 404 error messages indicates that Tomcat actually IS running. If you shut it down from Eclipse, you won’t get those 404’s anymore

answered Jul 22, 2009 at 7:10

How to do it.

Firstly open the Server’s view in Eclipse. (Window >> Show View >> Servers).
Double click on your Tomcat Server to open the Server Overview.
Then set the Server Locations to Use Tomcat installation (takes control of Tomcat installation). Save the changes.
Restart your Server and then go to localhost:8080. This should open the Apache Tomcat Homepage for your server.

Hope this helps!

answered Apr 14, 2012 at 20:46

Shane DoyleShane Doyle

1,0661 gold badge12 silver badges16 bronze badges

Now close it, save it and try run your server and then rerun the URL.

answered May 1, 2012 at 20:20

SonuSonu

511 silver badge1 bronze badge

I agree to drvdijk.

Look for the system property «-Dwtp.deploy». This directory is where your Tomcat is looking for installed web applications, i think you don’t have ROOT.war application here. Isn’t it?

Hope this will help you

answered Jul 22, 2009 at 7:35

sourcerebelssourcerebels

5,1401 gold badge32 silver badges52 bronze badges

answered Jul 24, 2009 at 15:23

The problem is just as drvdijk mentioned, in order to run a webapp on tomcat from eclipse, it needs to be «deployed» to it. This can be done by right clicking the tomcat server -> add and remove

Alternatively, you can try to startup your tomcat server outside of eclipse. Go to your command line and type

  $CATALINA_HOMEbinstartup.bat          (Windows)

  $CATALINA_HOME/bin/startup.sh           (Unix)

Where $catalina_home is the directory of where you installed tomcat

answered Jan 8, 2012 at 23:41

kumikodakumikoda

6446 silver badges27 bronze badges

Launch your eclipse Run as administration:
For that right click on eclipse——> run as administration.
It works.

If it not works then again do same and then follow these steps:

In Eclipse, right click on server —> Properties —> Click Switch
Location —> Apply—>Ok
(This will switch the [workspace metadata]
location to the installed Tomcat location.)

Then go back to server, double click it. This will open Overview
tab. Under this tab goto —>Server Location —> Select Use Tomcat
Installation combo box.

Now close it, save it and try run your server and then rerun the URL.

Panther

3,3029 gold badges27 silver badges50 bronze badges

answered Dec 16, 2016 at 9:55

1- double click on server
2- Make Sure You have switched correctly the directory for tomcat here

Before

enter image description here

After Fix
enter image description here

3- And Even if you do #2 above you may need do this here as well !

Again here !

enter image description here

answered Dec 19, 2017 at 20:20

shareefshareef

9,19513 gold badges58 silver badges89 bronze badges

Also, notice if you have a duplicated WEB-INF in your path. Sometimes after update a maven project you may have this issue and Tomcat points to an empty folder.

Try to use Tomcat 9 Instead of Tomcat 10

Eric Aya

69.5k35 gold badges181 silver badges252 bronze badges

answered Jul 6, 2022 at 18:04

стасевичстасевич

2782 silver badges10 bronze badges

Источник

Details: Written by; Last Updated on 05 November 2019 | Print Email

In Java web development with Tomcat, it’s very often that you get HTTP 404 error like this:

tomcat-error-404

The error code is HTTP 404 (not found) and the description is:

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

This error means the server could not find the requested resource (JSP, HTML, images…) and returns HTTP status code 404. Most of the time, you can fix this error by correcting the URL. However, sometimes it’s not easy like that, making it is an annoying error.

Here I suggest some possible reasons and how to fix the error HTTP 404 in Java web development with Tomcat.

1. The URL is not handled by any Java servlets

You need to check URL mapping in your servlet classes to make sure the requested URL is actually handled by a servlet. For example:

@WebServlet("/view_book")
public class ViewBookServlet extends HttpServlet {
...
}

This servlet handles the URL /view_book. If the request URL is /view_books the server will raise HTTP 404 error. You can fix by either correcting the URL or correcting the URL mapping in the @WebServlet annotation.

In older Java web application, you have to check the web deployment descriptor file web.xml because a Java servlet can be mapped to URL via XML like this:

<servlet-mapping>
    <servlet-name>ViewBookServlet</servlet-name>
    <url-pattern>/view_book</url-pattern>
</servlet-mapping>

2. Java servlet forwarding to a resource that does not exist

In this case, the requested URL is handled by a Java servlet, but code in the servlet forwards to a resource (JSP, HTML…) which does not exist, as shown in the following screenshot:

tomcat-error-404-forwarding

The code in the servlet class would look like this:

String registerForm = "frontend/registerform.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(registerForm);
dispatcher.forward(request, response);

You can fix by correcting the forward path in the servlet, and make sure that the forwarded resource does actually exist in the given path.

3. URL is case-sensitive

Note that Tomcat treats URL as case-sensitive, for instance /Register is different than /register. So you need to check and use correct case for the letters in request URL.

Also pay attention to the webapp name in the URL, for instance http://localhost:8080/BookstoreWebsite/ is different than http://localhost:8080/BookStoreWebsite/

TIP: in Eclipse, you can right click on the project, then click Run As > Run on Server, the IDE will always use the correct name of the web application.

Finally, you should not let the user see the raw HTTP 404 error page rendered by the server. Instead, you should design your own user-friendly 404 error page – follow this tutorial: How to Handle Error for Java web applications.

You can also watch the video version below:

About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.

Add comment

Источник

This error indicates that the server could not find the desired resource. This resource can be any file such as JSP, HTML, or image resource. Usually, the resource is present, but it is referenced incorrectly. In most cases, you can fix this by correcting the URL. Here are three strategies you can use to look for errors:

Java servlets do not handle URL
Servlet forwarding the resource does not exist
URL is case-sensitive

1. Java servlets do not handle URL

Your @Webservlet() may handle for URL/name; however, the URL requested may be URL/this_name (different reference). You can fix this by correcting the reference URL or URL mapping.

In code, it may look something like this:

@WebServlet("/name")
public class Name extends HttpServlet {
...
}

However, your website requested /this_name instead of /name. One way you can correct this is by changing /name to /this_name in your URL mapping.

2. Servlet forwarding the resource does not exist

Make sure that the forwarded resource exists. If the resource you are trying to reference is not named correctly, you may also run into this problem. For instance, you are referencing signupForm.jsp, but the name of the resource is signup_Form.jsp. In code it may look something like this:

String signupForm= "frontend/signupForm.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(signupForm);
dispatcher.forward(request, response);

You can fix this by correcting the servlet’s path which, in this case, would be to change signupForm.jsp to signup_Form.jsp.

3. URL is case-sensitive

If you typed the URL yourself, you might have mistyped it. Tomcat URLs are case-sensitive. For instance, signup is different than signUp. Make sure your URL is case-sensitive.

Источник

As previous answers mentioned before, you’re using Spring Boot, which has its embedded Tomcat server under the hood. It’s the default behavior, but you may configure your Spring Boot project to use Netty or Undertow servers, please check more details here — Embedded Web Servers

So since you already have the Tomcat server, there is no need to configure it in your IDE. Also, worth mentioning that running a project from your IDE is not the best idea. Especially, when you’re describing your steps for reproducing the issue to someone else. Instead, you may run your Spring Boot project from the command line using the such command:

mvn spring-boot:run

By default, it’ll start your application on the 8080 port and you will be able to access your homepage at this URL: localhost:8080/home

For more details on running your Spring Boot application, you may check this document — Running your application

To run the Spring Boot project from your IntelliJ IDEA, you need to open the DemoApplication class (in your case), which has the main method. And on the left, there should be a play button for running your project. You can also configure it in the ‘Edit configurations’ menu by selecting the ‘Spring Boot’ item under the ‘Add new configuration’ menu.

Updated:

I’m using that you’re using macOS. To identify the process running on the 8080 port, which prevents you from starting your Spring Boot application, you may use such command:

sudo lsof -i :8080

This is the example output of this command from my machine, which has the Docker container running on the 8080 port:

COMMAND    PID     USER   FD   TYPE            DEVICE SIZE/OFF NODE NAME
com.docke 3134 golovnya  174u  IPv6 0xcaf3b5f3fb45111      0t0  TCP *:http-alt (LISTEN)

Here we’re interested in PID, which stands for the process identifier. It’s a unique id of the running application. In my case, the PID of the process running on the 8080 port is 3134. Knowing this, we may kill this process by the following command:

kill -9 <PID>

In my case it will look like this:

kill -9 3134

That’s all.

P.S. If it looks a bit complicated to your or you experience some issues, reloading your machine is always not a bad idea.

#java #spring #tomcat #intellij-idea #servlets

#java #весна #tomcat #intellij-идея #сервлеты

Вопрос:

Я сделал все в этом видео: но когда я печатаю: http://localhost:8080/spring-sample-1.0-SNAPSHOT/hello

Появляется эта ошибка:

 HTTP Status 404 – Not Found
Type Status Report

Message The requested resource [/spring-sample-1.0-SNAPSHOT/hello] is not available

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Единственное, что я изменил, было в: tomcat/bin/setclasspath.bat, я добавил туда одну строку:

 set JRE_HOME=C:Program FilesJavajre1.8.0_271

Потому что без этого сервер не запускается

Хорошо, итак, мое приложение действительно простое, я создал проект mvn на java 15, затем два класса:

Конфигурация:

 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

@Configuration
@ComponentScan({"app"})
@EnableWebMvc
public class Config extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[0];
    }

    @Override
    protected String[] getServletMappings() {
        return new String[0];
    }
}

Здравствуйте:

 
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Hello {

    @GetMapping("/hello")
    public String get(){
        return "Bycza zagroda!";
    }
}

pom.xml:

 <project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>pl.bykowski</groupId>
    <artifactId>spring-sample</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Затем я упаковал все в файл war и добавил его в менеджер tomcat здесь: файл WAR для развертывания

После этого я нажал /spring-sample-1.0-SNAPSHOT в модуле tomcat

а затем набрал привет в конце

Есть идеи, что происходит не так? :/

1. Предоставленное вами видео не на английском языке. Кроме того, вы не должны ожидать, что мы посмотрим 19-минутное видео, чтобы понять, что вы сделали в качестве кода. Поэтому, пожалуйста, предоставьте достаточно кода, чтобы помочь нам понять ваш код и проблему, чтобы мы могли помочь

2. @UsemeAlehosaini Извините, теперь я это исправил

Ответ №1:

Я обнаружил проблему: в классе конфигурации вы указали неправильные значения для сопоставления сервлетов и класса конфигурации сервлета. Пожалуйста, измените класс конфигурации следующим образом:

 @Configuration
@ComponentScan({"app"})
@EnableWebMvc
public class Config extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] {Config.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

Ответ №2:

Прежде всего, я рекомендую установить переменную JAVA_HOME или JRE_HOME env для ОС. Для получения более подробной информации: https://confluence.atlassian.com/doc/setting-the-java_home-variable-in-windows-8895.html В любом случае изменение файлов tomcat — не очень хорошая идея 🙂

Для решения проблемы с недоступным URL, пожалуйста, проверьте:

для установленного tomcat:

как правило, имя файла war — это имя контекста и часть URL-адреса (spring-sample-1.0-SNAPSHOT), но это имя может быть настроено в context.xml (Документация: https://tomcat.apache.org/tomcat-8.0-doc/config/context.html )
откройте окно менеджера, как вы можете видеть на видео (http://localhost:8080/manager/html ) и найдите ссылку вашего веб-приложения

для встроенного tomcat:

контекстный путь должен быть похож на artifactId в pom.xml

1. В моей ситуации имя контекста — это имя файла .war. Также в ( localhost:8080/manager/html ) мое приложение отображается как ссылка: (/spring-sample-1.0-SNAPSHOT). artifactId = ‘spring-sample’ в pom.xml @заставка

2. Каков статус развертывания в tomcat для этого приложения war? Я думаю, что в вашем приложении есть ошибки во время процесса развертывания. И дополнительный вопрос: как вы собираетесь запускать приложение, которое скомпилировано на java 15, но tomcat был запущен под java 1.8? Вы получите исключение несовместимости версии java

Ответ №3:

@saver
Журнал из tomcat при развертывании:

 21-Dec-2020 16:49:22.227 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war]
21-Dec-2020 16:49:24.113 INFO [http-nio-8000-exec-17] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
21-Dec-2020 16:49:24.138 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war] has finished in [1,907] ms

Итак, какие версии JRE и JDK я должен использовать?

Ответ №4:

@daniep kajoi вы должны установить путь на java 15 для tomcat или изменить атрибут maven.compiler.source в pom.xml на версии 1.8 — один из двух вариантов. И я вижу в вашем журнале, что ваш путь ‘spring-sample3-1.0-SNAPSHOT.war’

 21-Dec-2020 16:49:22.227 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war]
21-Dec-2020 16:49:24.113 INFO [http-nio-8000-exec-17] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
21-Dec-2020 16:49:24.138 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war] has finished in [1,907] ms

попробуйте открыть url: http://localhost:8080/spring-sample3-1.0-SNAPSHOT.war/hello

Tomcat сообщает об ошибке, когда IntelliJ IDEA запускает проект: не удалось загрузить ресурс

В первый раз, когда я использую IntelliJ IDEA, я использовал eclipse раньше

Я с радостью готовился испытать новые инструменты разработки, но как только проект импорта начался, у меня возникла ошибка

После импорта проекта и настройки jdk tomcat запустится со следующей ошибкой:

Failed to load resource: the server responded with a status of 404 (Not Found)

Я думал, что это проблема с импортом Tomcat, поэтому долго менял.

Наконец обнаружил, что это была очень простая ошибка, решение заключается в следующем:

Нажмите 【Edit configurations…], выберите импортированный Tomcat, как показано ниже:

! ! нота! !
Имя хвоста URL в [server] должно совпадать с именем Application Context в [deployment]! ! (Расположение ① и ② на следующих двух рисунках)

Решено ~~ Кто бы мог подумать, что я чуть не переустановил его заново. .

Наконец-то я могу счастливо поиграть с IntelliJ IDEA

mvn spring-boot:run

By default, it’ll start your application on the 8080 port and you will be able to access your homepage at this URL: localhost:8080/home

For more details on running your Spring Boot application, you may check this document — Running your application

Updated:

I’m using that you’re using macOS. To identify the process running on the 8080 port, which prevents you from starting your Spring Boot application, you may use such command:

sudo lsof -i :8080

This is the example output of this command from my machine, which has the Docker container running on the 8080 port:

COMMAND    PID     USER   FD   TYPE            DEVICE SIZE/OFF NODE NAME
com.docke 3134 golovnya  174u  IPv6 0xcaf3b5f3fb45111      0t0  TCP *:http-alt (LISTEN)

kill -9 <PID>

In my case it will look like this:

kill -9 3134

That’s all.

P.S. If it looks a bit complicated to your or you experience some issues, reloading your machine is always not a bad idea.

Details: Written by; Last Updated on 05 November 2019 | Print Email

In Java web development with Tomcat, it’s very often that you get HTTP 404 error like this:

tomcat-error-404

The error code is HTTP 404 (not found) and the description is:

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Here I suggest some possible reasons and how to fix the error HTTP 404 in Java web development with Tomcat.

1. The URL is not handled by any Java servlets

You need to check URL mapping in your servlet classes to make sure the requested URL is actually handled by a servlet. For example:

@WebServlet("/view_book")
public class ViewBookServlet extends HttpServlet {
...
}

In older Java web application, you have to check the web deployment descriptor file web.xml because a Java servlet can be mapped to URL via XML like this:

<servlet-mapping>
    <servlet-name>ViewBookServlet</servlet-name>
    <url-pattern>/view_book</url-pattern>
</servlet-mapping>

2. Java servlet forwarding to a resource that does not exist

In this case, the requested URL is handled by a Java servlet, but code in the servlet forwards to a resource (JSP, HTML…) which does not exist, as shown in the following screenshot:

tomcat-error-404-forwarding

The code in the servlet class would look like this:

String registerForm = "frontend/registerform.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(registerForm);
dispatcher.forward(request, response);

You can fix by correcting the forward path in the servlet, and make sure that the forwarded resource does actually exist in the given path.

3. URL is case-sensitive

Note that Tomcat treats URL as case-sensitive, for instance /Register is different than /register. So you need to check and use correct case for the letters in request URL.

Also pay attention to the webapp name in the URL, for instance http://localhost:8080/BookstoreWebsite/ is different than http://localhost:8080/BookStoreWebsite/

TIP: in Eclipse, you can right click on the project, then click Run As > Run on Server, the IDE will always use the correct name of the web application.

You can also watch the video version below:

About the Author:

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Last Update:2017-05-24
Source: Internet

Author: User

I’m going to make a POC, get an old project, use the war exploded to deploy to the native Tomcat (version 8.5)

When you start Tomcat by IntelliJ idea, you find that the login page of the system is http-status-404 error, and when you open http://localhost:8080 directly in the browser, you can open the Tomcat welcome page, It means Tomcat is up, but it doesn’t load the WebApps directory properly.

Even more strangely, the startup script under Tomcat’s Bin directory can start normally, either by double-clicking Startup.bat or by using Catalina.bat run under the directory’s CMD to start the project normally.

If you have a similar situation of friends, you can pay attention to the two startup mode at the start of the log environment variables, especially catalina_home.

Because the value of this variable is different on my machine when it is started in two ways, Catalina_home is the Tomcat directory where the bin is located when it is started by the bat script in the bin directory;

But when you start with IntelliJ idea, the value of the variable changes to: C:UsersCratical. Intellijidea2017.1systemtomcatunnamed_test-project_3_0_4

Two directories under the Conf folder, the folder inside the name and number of configuration files are the same, through the comparison, found in the Conf directory, Server.xml content There are some differences, note this line

autodeploy= «true» deployonstartup= » False «deployignore=» ^ (?! (manager) | (Tomee) $). * «>

Because in IntelliJ idea, a war format artifact can modify the location of the output directory, the default is the target folder under the current project root directory, if you use IntelliJ directly When idea started Tomcat, the WebApps directory under the Tomcat directory was unable to find the associated deployment folder.

IntelliJ idea is to achieve this goal by generating one of its own catalina_home, modifying the appbase in Server.xml.

Go back to that line of configuration, note that the deployignore property, my web directory name is exactly matched by the above regular expression, so Tomcat is directly ignored when loading, resulting in the 404 error.

The meanings of the various configurations in Tomcat Server.xml, see: http://www.importnew.com/17124.html

Intellij idea + Tomcat resolution for HTTP status 404 error

MichaelPak

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09.07.2014, 18:04. Показов 16933. Ответов 4

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Проблема уже обсуждалась здесь, но никто так и не ответил.

Создаю проект:

Полсе этого сразу же пытаюсь запустить дефолтный index.jsp:

В output следующее:

Bash

"/Users/michaelpak/tomcat 8/bin/catalina.sh" run [2014-07-09 05:49:26,124] Artifact WebApp:war exploded: Server is not connected. Deploy is not available. 09-Jul-2014 17:49:27.027 INFO [main] org.apache.catalina.core.AprLifecycleListener.init The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/michaelpak/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:. 09-Jul-2014 17:49:27.422 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"] 09-Jul-2014 17:49:27.442 SEVERE [main] org.apache.coyote.AbstractProtocol.init Failed to initialize end point associated with ProtocolHandler ["http-nio-8080"]  java.net.BindException: Address already in use     at sun.nio.ch.Net.bind0(Native Method)     at sun.nio.ch.Net.bind(Net.java:414)     at sun.nio.ch.Net.bind(Net.java:406)     at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)     at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)     at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:343)     at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:727)     at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:456)     at org.apache.coyote.http11.AbstractHttp11JsseProtocol.init(AbstractHttp11JsseProtocol.java:120)     at org.apache.catalina.connector.Connector.initInternal(Connector.java:960)     at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)     at org.apache.catalina.core.StandardService.initInternal(StandardService.java:567)     at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)     at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:834)     at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)     at org.apache.catalina.startup.Catalina.load(Catalina.java:576)     at org.apache.catalina.startup.Catalina.load(Catalina.java:599)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:483)     at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:310)     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:484)   09-Jul-2014 17:49:27.444 SEVERE [main] org.apache.catalina.core.StandardService.initInternal Failed to initialize connector [Connector[HTTP/1.1-8080]]  org.apache.catalina.LifecycleException: Failed to initialize component [Connector[HTTP/1.1-8080]]     at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106)     at org.apache.catalina.core.StandardService.initInternal(StandardService.java:567)     at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)     at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:834)     at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)     at org.apache.catalina.startup.Catalina.load(Catalina.java:576)     at org.apache.catalina.startup.Catalina.load(Catalina.java:599)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:483)     at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:310)     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:484) Caused by: org.apache.catalina.LifecycleException: Protocol handler initialization failed     at org.apache.catalina.connector.Connector.initInternal(Connector.java:962)     at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)     ... 12 more Caused by: java.net.BindException: Address already in use     at sun.nio.ch.Net.bind0(Native Method)     at sun.nio.ch.Net.bind(Net.java:414)     at sun.nio.ch.Net.bind(Net.java:406)     at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)     at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)     at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:343)     at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:727)     at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:456)     at org.apache.coyote.http11.AbstractHttp11JsseProtocol.init(AbstractHttp11JsseProtocol.java:120)     at org.apache.catalina.connector.Connector.initInternal(Connector.java:960)     ... 13 more   09-Jul-2014 17:49:27.444 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"] 09-Jul-2014 17:49:27.456 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read 09-Jul-2014 17:49:27.462 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 904 ms 09-Jul-2014 17:49:27.503 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina 09-Jul-2014 17:49:27.503 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.9 09-Jul-2014 17:49:27.511 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"] 09-Jul-2014 17:49:27.520 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 57 ms Connected to server [2014-07-09 05:49:27,905] Artifact WebApp:war exploded: Artifact is being deployed, please wait... [2014-07-09 05:49:28,383] Artifact WebApp:war exploded: Artifact is deployed successfully [2014-07-09 05:49:28,384] Artifact WebApp:war exploded: Deploy took 478 milliseconds 09-Jul-2014 17:49:37.514 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /Users/michaelpak/tomcat 8/webapps/manager 09-Jul-2014 17:49:37.567 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /Users/michaelpak/tomcat 8/webapps/manager has finished in 52 ms

И браузер автоматически открывает страницу index.jsp, которую не может найти:

И на последок конфигурации:

Как и предыдущий новичок в этом деле, промучился около 4 часов. Подскажите, в чем может быть проблема?

Добавлено через 5 минут
index.jsp:

HTML5

1 2 3 4 5 6 7 8 9

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html>   <head>     <title></title>   </head>   <body>     </body> </html>

web.xml:

XML

1 2 3 4 5 6

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"          version="3.1"> </web-app>

__________________
Помощь в написании контрольных, курсовых и дипломных работ, диссертаций здесь

Эксперт Java

4087 / 3821 / 745

Регистрация: 18.05.2010

Сообщений: 9,331

Записей в блоге: 11

09.07.2014, 20:01

Лучший ответ Сообщение было отмечено MichaelPak как решение

Решение

java.net.BindException: Address already in use

Кто-то уже пользуется одним из тех портов, которые вы указали.

Если в командной строке выполнить:
netstat -ano | findstr 8080
То можно узнать PID процесса, который занимает порт и попробовать убить его.

0 / 0 / 0

Регистрация: 02.08.2011

Сообщений: 31

09.07.2014, 23:46

[ТС]

Вот такую штуку пишет:

Миниатюры

Intellij Idea + Tomcat = ERROR 404

Эксперт Java

2390 / 2216 / 564

Регистрация: 28.12.2010

Сообщений: 8,658

10.07.2014, 00:32

Лучший ответ Сообщение было отмечено MichaelPak как решение

Решение

MichaelPak, найдите этот процесс в таск манагере (по айди) и убейте.

MichaelPak

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Регистрация: 02.08.2011

Сообщений: 31

10.07.2014, 12:45

[ТС]

Убить процесс с именем Java?

Добавлено через 1 час 52 минуты
Поймите, что наш если бы 8080-й порт был занят, то была бы ошибка браузера. А страницу 404 формирует сервер tomcat. Не думаю, что в этом дело.

Добавлено через 22 минуты
Господа, прошу прощения, вы были правы. Убив процесс:

Bash

1	sudo kill -9 12507

сервер заработал:
http://habrastorage.org/files/… 95e99d.png

I’m having a problem with my first Web Application. I use IntelliJ as IDE and Tomcat as Webserver.
Every servlet I’ve tried to acces, throws an 404 Error. Even if I copy some youtube tutorials, which seems to work like a charm.

The button in the form sends me to: http://localhost:8080/IUBHQuiz/login

Can you tell me whats wrong? I am going nuts.

login.java

package com.example.IUBHQuiz;
import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.sql.*;
@WebServlet("/login")
public class login extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String email = request.getParameter("fmail");
String pass = request.getParameter("fpw");
if(email.equals("j") && pass.equals("j"))
{
RequestDispatcher rs = request.getRequestDispatcher("/main.jsp");
rs.forward(request, response);
}
else
{
out.println("Username or Password incorrect");
RequestDispatcher rs = request.getRequestDispatcher("/index.jsp");
rs.include(request, response);
}
out.close();
}

index.jsp

<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<title>IUBH Quiz</title>
<link href="./resources/css/style.css" rel="stylesheet">
</head>
<body>
<div class="main">
<div class="image-container">
<img src="./resources/images/logo.png" alt="Logo">
</div>
<div class="Login">
<h1>Willkommen beim IUBH-Quiz!</h1>
<form action="login" method="post">
E-Mail:<input type="text" id="fmail" name="fmail"><br><br>
Passwort: <input type="password" id="fpw" name="fpw"><br><br>
<input type="submit" value="Log In" class="button">
</form>
</div>
<div class="Links">
<a href="#">Passwort vergessen</a>
<a href="#">Registrieren</a>
</div>
</div>
</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
</web-app>

Tomcat сообщает об ошибке, когда IntelliJ IDEA запускает проект: не удалось загрузить ресурс

В первый раз, когда я использую IntelliJ IDEA, я использовал eclipse раньше

После импорта проекта и настройки jdk tomcat запустится со следующей ошибкой:

Failed to load resource: the server responded with a status of 404 (Not Found)

Я думал, что это проблема с импортом Tomcat, поэтому долго менял.

Наконец обнаружил, что это была очень простая ошибка, решение заключается в следующем:

Нажмите 【Edit configurations…], выберите импортированный Tomcat, как показано ниже:

Решено ~~ Кто бы мог подумать, что я чуть не переустановил его заново. .

Наконец-то я могу счастливо поиграть с IntelliJ IDEA

MichaelPak

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Регистрация: 02.08.2011

Сообщений: 31

09.07.2014, 18:04. Показов 17274. Ответов 4

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Студворк — интернет-сервис помощи студентам

Проблема уже обсуждалась здесь, но никто так и не ответил.

Создаю проект:

Полсе этого сразу же пытаюсь запустить дефолтный index.jsp:

В output следующее:

Bash

"/Users/michaelpak/tomcat 8/bin/catalina.sh" run
[2014-07-09 05:49:26,124] Artifact WebApp:war exploded: Server is not connected. Deploy is not available.
09-Jul-2014 17:49:27.027 INFO [main] org.apache.catalina.core.AprLifecycleListener.init The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/michaelpak/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
09-Jul-2014 17:49:27.422 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"]
09-Jul-2014 17:49:27.442 SEVERE [main] org.apache.coyote.AbstractProtocol.init Failed to initialize end point associated with ProtocolHandler ["http-nio-8080"]
 java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:414)
    at sun.nio.ch.Net.bind(Net.java:406)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:343)
    at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:727)
    at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:456)
    at org.apache.coyote.http11.AbstractHttp11JsseProtocol.init(AbstractHttp11JsseProtocol.java:120)
    at org.apache.catalina.connector.Connector.initInternal(Connector.java:960)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
    at org.apache.catalina.core.StandardService.initInternal(StandardService.java:567)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
    at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:834)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:576)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:599)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:310)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:484)
 
09-Jul-2014 17:49:27.444 SEVERE [main] org.apache.catalina.core.StandardService.initInternal Failed to initialize connector [Connector[HTTP/1.1-8080]]
 org.apache.catalina.LifecycleException: Failed to initialize component [Connector[HTTP/1.1-8080]]
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106)
    at org.apache.catalina.core.StandardService.initInternal(StandardService.java:567)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
    at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:834)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:576)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:599)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:310)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:484)
Caused by: org.apache.catalina.LifecycleException: Protocol handler initialization failed
    at org.apache.catalina.connector.Connector.initInternal(Connector.java:962)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
    ... 12 more
Caused by: java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:414)
    at sun.nio.ch.Net.bind(Net.java:406)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:343)
    at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:727)
    at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:456)
    at org.apache.coyote.http11.AbstractHttp11JsseProtocol.init(AbstractHttp11JsseProtocol.java:120)
    at org.apache.catalina.connector.Connector.initInternal(Connector.java:960)
    ... 13 more
 
09-Jul-2014 17:49:27.444 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
09-Jul-2014 17:49:27.456 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
09-Jul-2014 17:49:27.462 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 904 ms
09-Jul-2014 17:49:27.503 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina
09-Jul-2014 17:49:27.503 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.9
09-Jul-2014 17:49:27.511 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
09-Jul-2014 17:49:27.520 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 57 ms
Connected to server
[2014-07-09 05:49:27,905] Artifact WebApp:war exploded: Artifact is being deployed, please wait...
[2014-07-09 05:49:28,383] Artifact WebApp:war exploded: Artifact is deployed successfully
[2014-07-09 05:49:28,384] Artifact WebApp:war exploded: Deploy took 478 milliseconds
09-Jul-2014 17:49:37.514 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /Users/michaelpak/tomcat 8/webapps/manager
09-Jul-2014 17:49:37.567 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /Users/michaelpak/tomcat 8/webapps/manager has finished in 52 ms

И браузер автоматически открывает страницу index.jsp, которую не может найти:

И на последок конфигурации:

Как и предыдущий новичок в этом деле, промучился около 4 часов. Подскажите, в чем может быть проблема?

Добавлено через 5 минут
index.jsp:

HTML5

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title></title>
  </head>
  <body>
 
  </body>
</html>

web.xml:

XML

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
</web-app>

Эксперт Java

4088 / 3822 / 745

Регистрация: 18.05.2010

Сообщений: 9,331

Записей в блоге: 11

09.07.2014, 20:01

Лучший ответ Сообщение было отмечено MichaelPak как решение

Решение

java.net.BindException: Address already in use

Кто-то уже пользуется одним из тех портов, которые вы указали.

0 / 0 / 0

Регистрация: 02.08.2011

Сообщений: 31

09.07.2014, 23:46

[ТС]

Вот такую штуку пишет:

Миниатюры

Intellij Idea + Tomcat = ERROR 404

Эксперт Java

2392 / 2218 / 564

Регистрация: 28.12.2010

Сообщений: 8,662

10.07.2014, 00:32

Лучший ответ Сообщение было отмечено MichaelPak как решение

Решение

MichaelPak, найдите этот процесс в таск манагере (по айди) и убейте.

MichaelPak

0 / 0 / 0

Регистрация: 02.08.2011

Сообщений: 31

10.07.2014, 12:45

[ТС]

Убить процесс с именем Java?

Добавлено через 22 минуты
Господа, прошу прощения, вы были правы. Убив процесс:

Bash

1	sudo kill -9 12507

сервер заработал:
http://habrastorage.org/files/… 95e99d.png

#java #spring #tomcat #intellij-idea #servlets

#java #весна #tomcat #intellij-идея #сервлеты

Вопрос:

Я сделал все в этом видео: но когда я печатаю: http://localhost:8080/spring-sample-1.0-SNAPSHOT/hello

Появляется эта ошибка:

 HTTP Status 404 – Not Found
Type Status Report

Message The requested resource [/spring-sample-1.0-SNAPSHOT/hello] is not available

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Единственное, что я изменил, было в: tomcat/bin/setclasspath.bat, я добавил туда одну строку:

 set JRE_HOME=C:Program FilesJavajre1.8.0_271

Потому что без этого сервер не запускается

Хорошо, итак, мое приложение действительно простое, я создал проект mvn на java 15, затем два класса:

Конфигурация:

 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

@Configuration
@ComponentScan({"app"})
@EnableWebMvc
public class Config extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[0];
    }

    @Override
    protected String[] getServletMappings() {
        return new String[0];
    }
}

Здравствуйте:

 
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Hello {

    @GetMapping("/hello")
    public String get(){
        return "Bycza zagroda!";
    }
}

pom.xml:

 <project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>pl.bykowski</groupId>
    <artifactId>spring-sample</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Затем я упаковал все в файл war и добавил его в менеджер tomcat здесь: файл WAR для развертывания

После этого я нажал /spring-sample-1.0-SNAPSHOT в модуле tomcat

а затем набрал привет в конце

Есть идеи, что происходит не так? :/

1. Предоставленное вами видео не на английском языке. Кроме того, вы не должны ожидать, что мы посмотрим 19-минутное видео, чтобы понять, что вы сделали в качестве кода. Поэтому, пожалуйста, предоставьте достаточно кода, чтобы помочь нам понять ваш код и проблему, чтобы мы могли помочь

2. @UsemeAlehosaini Извините, теперь я это исправил

Ответ №1:

 @Configuration
@ComponentScan({"app"})
@EnableWebMvc
public class Config extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] {Config.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

Ответ №2:

Для решения проблемы с недоступным URL, пожалуйста, проверьте:

для установленного tomcat:

как правило, имя файла war — это имя контекста и часть URL-адреса (spring-sample-1.0-SNAPSHOT), но это имя может быть настроено в context.xml (Документация: https://tomcat.apache.org/tomcat-8.0-doc/config/context.html )
откройте окно менеджера, как вы можете видеть на видео (http://localhost:8080/manager/html ) и найдите ссылку вашего веб-приложения

для встроенного tomcat:

контекстный путь должен быть похож на artifactId в pom.xml

1. В моей ситуации имя контекста — это имя файла .war. Также в ( localhost:8080/manager/html ) мое приложение отображается как ссылка: (/spring-sample-1.0-SNAPSHOT). artifactId = ‘spring-sample’ в pom.xml @заставка

2. Каков статус развертывания в tomcat для этого приложения war? Я думаю, что в вашем приложении есть ошибки во время процесса развертывания. И дополнительный вопрос: как вы собираетесь запускать приложение, которое скомпилировано на java 15, но tomcat был запущен под java 1.8? Вы получите исключение несовместимости версии java

Ответ №3:

@saver
Журнал из tomcat при развертывании:

 21-Dec-2020 16:49:22.227 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war]
21-Dec-2020 16:49:24.113 INFO [http-nio-8000-exec-17] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
21-Dec-2020 16:49:24.138 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war] has finished in [1,907] ms

Итак, какие версии JRE и JDK я должен использовать?

Ответ №4:

 21-Dec-2020 16:49:22.227 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war]
21-Dec-2020 16:49:24.113 INFO [http-nio-8000-exec-17] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
21-Dec-2020 16:49:24.138 INFO [http-nio-8000-exec-17] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive [C:UsersDamianDesktopJAVAapache-tomcat-8.5.61webappsspring-sample3-1.0-SNAPSHOT.war] has finished in [1,907] ms

попробуйте открыть url: http://localhost:8080/spring-sample3-1.0-SNAPSHOT.war/hello

        /tmp/apache-tomcat-8.5.38/bin/catalina.sh run
    [2019-02-24 11:24:53,412] Artifact InsbotTomcat:war: Waiting for server connection to start artifact deployment...
    [2019-02-24 11:24:53,412] Artifact web:war exploded: Waiting for server connection to start artifact deployment...
    24-Feb-2019 23:24:54.294 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version:        Apache Tomcat/8.5.38
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built:          Feb 5 2019 11:42:42 UTC
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server number:         8.5.38.0
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name:               Mac OS X
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version:            10.12.6
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture:          x86_64
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home:             /Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version:           1.8.0_201-b09
    24-Feb-2019 23:24:54.296 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor:            Oracle Corporation
    24-Feb-2019 23:24:54.297 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:         /Users/diyu/Library/Caches/IntelliJIdea2018.3/tomcat/Tomcat_8_5_38_InsbotTomcat
    24-Feb-2019 23:24:54.297 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:         /private/tmp/apache-tomcat-8.5.38
    24-Feb-2019 23:24:54.297 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/Users/diyu/Library/Caches/IntelliJIdea2018.3/tomcat/Tomcat_8_5_38_InsbotTomcat/conf/logging.properties
    24-Feb-2019 23:24:54.297 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
    24-Feb-2019 23:24:54.298 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote=
    24-Feb-2019 23:24:54.298 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.port=1099
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.ssl=false
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.password.file=/Users/diyu/Library/Caches/IntelliJIdea2018.3/tomcat/Tomcat_8_5_38_InsbotTomcat/jmxremote.password
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcom.sun.management.jmxremote.access.file=/Users/diyu/Library/Caches/IntelliJIdea2018.3/tomcat/Tomcat_8_5_38_InsbotTomcat/jmxremote.access
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.rmi.server.hostname=127.0.0.1
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
    24-Feb-2019 23:24:54.300 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dignore.endorsed.dirs=
    24-Feb-2019 23:24:54.301 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/Users/diyu/Library/Caches/IntelliJIdea2018.3/tomcat/Tomcat_8_5_38_InsbotTomcat
    24-Feb-2019 23:24:54.301 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/tmp/apache-tomcat-8.5.38
    24-Feb-2019 23:24:54.301 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/tmp/apache-tomcat-8.5.38/temp
    24-Feb-2019 23:24:54.301 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/Users/diyu/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.]
    24-Feb-2019 23:24:54.457 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"]
    24-Feb-2019 23:24:54.477 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
    24-Feb-2019 23:24:54.494 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
    24-Feb-2019 23:24:54.496 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
    24-Feb-2019 23:24:54.497 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 591 ms
    24-Feb-2019 23:24:54.527 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
    24-Feb-2019 23:24:54.527 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.38
    24-Feb-2019 23:24:54.537 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
    24-Feb-2019 23:24:54.548 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
    24-Feb-2019 23:24:54.549 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 52 ms
    Connected to server
    [2019-02-24 11:24:55,011] Artifact InsbotTomcat:war: Artifact is being deployed, please wait...
    [2019-02-24 11:24:55,012] Artifact web:war exploded: Artifact is being deployed, please wait...
    24-Feb-2019 23:24:58.220 INFO [RMI TCP Connection(2)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
    [2019-02-24 11:24:58,277] Artifact InsbotTomcat:war: Artifact is deployed successfully
    [2019-02-24 11:24:58,277] Artifact InsbotTomcat:war: Deploy took 3,266 milliseconds
    [2019-02-24 11:24:58,342] Artifact web:war exploded: Artifact is deployed successfully
    [2019-02-24 11:24:58,342] Artifact web:war exploded: Deploy took 3,330 milliseconds
    24-Feb-2019 23:25:04.541 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/private/tmp/apache-tomcat-8.5.38/webapps/manager]
    24-Feb-2019 23:25:04.573 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/private/tmp/apache-tomcat-8.5.38/webapps/manager] has finished in [32] ms

В то время как автоматически открывающаяся страница выглядит так:

enter image description here

Я также попробовал http://localhost:8080/web_war_exploded/index.html, показывая тот же результат.

После Open Module Settings я изменил конфигурацию так: enter image description here

И это работает.

Ссылка

1 ответ

Проблема может заключаться в том, что каталогом развертывания является «webapps / manager» (/private/tmp/apache-tomcat-8.5.38/webapps/manager), а не «webapps».

ответ дан Freddy
17.05.2019, 03:28

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1. Java servlets do not handle URL

2. Servlet forwarding the resource does not exist

3. URL is case-sensitive

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Tomcat сообщает об ошибке, когда IntelliJ IDEA запускает проект: не удалось загрузить ресурс

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Tomcat сообщает об ошибке, когда IntelliJ IDEA запускает проект: не удалось загрузить ресурс

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