Java package does not exist intellij ошибка

Usually, Java developers face the “package does not exist” error when they import a package into their class. If you are one of them, it’s worth reading this article.

If you’re a Java developer, you may have encountered the “package does not exist” error at some point. This error occurs when the Java compiler is unable to find the package that you’re trying to use in your code.

In this article, we’ll discuss what is a package in Java and how to import a package in your Java program to utilize the built-in functionalities. Furthermore, we’ll also discuss the most common error that Java developers face which is Java package does not exist. So without further ado, let’s dive deep into the topic.

What is a Package in Java?

A package is a collection of related interfaces and classes. It helps us to organize different classes and interfaces in a folder structure. Each package in Java must have a unique name; it stores different classes in a separate namespace. We have two types of packages:

1. Built-in Packages (Come with Java API)
2. User-defined Packages (User created packages)

Packages improve the reusability of code and make it easy to locate. Packages are mainly used to avoid name conflicts between classes. Although classes with the same name are not allowed to appear in a package, they may appear in different packages.

How to Create And Use a Java Package in Java?

To create a package, we have to choose a unique name for the package and write a package statement on the top of the source file. After that, we can define all the classes, interfaces, enumerations, and annotations types we want in our package. 

The general syntax of creating a package is as follows:

package packagename;

Let’s create a user-defined package but first see its folder structure:

We have two classes in the package(mypackage) and the Main class that contain the main function.

Code of class1 

package mypackage;


public class class1 {

   public void welcome(){

       System.out.println("Welcome to my Class1");

   }
}

Code of class2

package mypackage;


public class class2 {

   public void welcome(){

       System.out.println("Welcome to my Class2");

   }

}

Code of Main class in which we import our package and create objects of its classes.

// import all class of mypackage

import mypackage.*;

public class Main {

   public static void main(String[] args) {

       // creating object of class1 of mypackage

       class1 c1= new class1();

       c1.welcome();



       // creating object of class1 of mypackage

       class2 c2= new class2();

       c2.welcome();



   }

}

Output

Welcome to my Class1

Welcome to my Class2

We can also import just one class of package just we have to write import mypackage.class1; in place of import mypackage.*;

What is the “Package Does Not Exist” Error in Java?

As we understand what a package is and how it stores in computer memory, Now we can easily understand what package does not exist error and when it occurs. We are getting this error because the compiler can not find the package we mention.

As in the above example, if we write mypackage1 instead of mypackage then we will get this error:

Reasons and Solution for the Java “Package Does Not Exist” Error

Following are some of the main reasons this error occurs:

1. Write the wrong name of the package
2. Install packages properly
3. IDE Problem
4. Setting Class Path
5. The package does not exist

Now we’ll discuss these reasons one by one and see what the solution to these reasons:

Case 1: Writing The Wrong Name of The Package

Most of the time, we face this problem when we write the wrong package name. Always double-check the package’s name so you don’t face this problem again. As in the above example, if we write mypackage in place of mypackage1, the error will be gone.

If you’re typing the package name manually, it’s easy to make a typo. Make sure you’re spelling the package name correctly, and double-check that you’re using the correct capitalization.

Case 2: Install Packages Properly

Sometimes we face this problem when our required package is not installed properly. If you are using IntelliJ IDE, then the settings for installing a package are:

1. Click File menu
2. Select the Project Structure option
3. From the left pane, move to the Global libraries under the platform setting
4. Click the + symbol 
5. Select the required package from the hard disk you want to install

That being said, this issue can potentially occur if the package is not imported. To use a package in your Java code, you need to import it using the import keyword. If you forget to import the package, or if you import the wrong package, you’ll get the “package does not exist” error. Ensure you’re importing the correct package, and double-check that you’re using the correct import statement.

Case 3: IDE Problem

If you are using IntelliJ or Eclipse IDE and you installed the package or created the package but still facing the problem, in this case, you have to rebuild the project. In Eclipse, if you have a Java package does not exist error then follow these steps:

1. In the project folder, go to the src folder, cut all the files and folder from it to a temporary folder.
2. Build the project
3. Now copy all the files and folders from the temporary folder to the src folder.
4. Run the build again

Now you don’t have the package does not exist error again. 

Case 4: Setting Class Path

We face this problem when the Class Path of our package is not set. To use a package in Java, it must be on the classpath. The classpath is a list of directories and JAR files that the Java compiler searches for class files. If the package you’re trying to use is not on the classpath, you’ll get the “package does not exist” error. To fix this, you need to add the package to the classpath.

To do so, follow these steps.

1. Type Environment variables in the search box.
2. Select Edit Environment variable option from the search.
3. Select the Advanced tab.
4. Click on the Environment Variables button.
5. Click on the New button under System Variables.
6. Add CLASSPATH as the variable name and the package’s path as a variable value.
7. Select OK.

Case 5: The Package Does Not Exist

In rare cases, the “package does not exist” error might occur because the package you’re trying to use does not actually exist. This can happen if you’re trying to use a third-party library that has been removed or if you’re trying to use a package that has been deprecated.

Additional Fixes

Conclusion

By understanding the causes of the “package does not exist” error, you can more easily troubleshoot and fix the problem. Make sure the package is on the classpath, check the spelling and capitalization of the package name, import the package correctly, and verify that the package actually exists. With these tips, you should be able to fix the “package does not exist” error and get your Java code running smoothly.

Finally, at the end of this article, we conclude this topic with this statement that the Java package does not exist is commonly caused if you type the wrong name of the package or do not set the classpath. Still, we sometimes face this problem due to IDE; we must rebuild our project or install the package properly.

Let’s have a quick review of the topics discussed in this article.

1. What is a package?
2. How can we create and use a package?
3. What is the package does not exist error in Java?
4. Reasons and solutions for the Java package do not exist.

If you are satisfied with the information given in this article, don’t forget to share it with your coding mates, also comment below 👇 which solution has worked in your case.

Импортировал проект в Intellij IDEA под Linux, все библиотеки maven подгрузил, но при сборке проекта получаю подобные ошибки на все зависимости:

Error:(4, 38) java: package org.springframework.stereotype does not
exist

Этот же проект под Windows в Intellij IDEA работает.
В чем причина может быть? Доступы?

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>com.project</groupId>
    <artifactId>SpringREST</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringREST</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.1.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

Issue

FULL DISCLOSURE:
I know this question has been asked before, but no previous answers actually solved my problem. Do not mark as duplicate please the answer in this question does not actually solve my problem.

I currently have 3 separate projects that use IntelliJ, one each for 3 different university courses. On one of them, JUnit testing works just fine without any issues. On the second project I haven’t had to do any JUnit testing so I don’t know whether or not it works on there. On a new project I created, it doesn’t work at all and gives me about 50 errors all along the lines of java: package org.junit does not exist.

I saw this question and followed the steps in the accepted answer to try and fix the problem. My project dependencies now looks like this:

I still get that error. My project directory looks like this:

Do I have to change the scope of the .jar files or the JUnit5.2 modules? My other project that JUnit is «accepted» on currently has JUnit5.0 listed in the modules page, and it shows up twice- once with the scope set to Compile and once with the scope set to Test. Is there a huge difference between JUnit5.0 and JUnit5.2 and how they work? Do I have to add JUnit5.2 again but with the Compile scope? If so, how?

This question doesn’t work either since it has to do with Android development and from what I can tell they have their project(s) set up completely different from me.

Solution

Thanks for uploading to github.

I imported your project to IntelliJ and hit build. I also got around 10 errors complaining about jUnit.

Solution:
— Go to the import statements for which you get error message that no package jar file is available. put cursor there and press ALT+ENTER. You will get options like this:

• Choose the first option and let the intelliJ studio add to classpath. you will get like this:

After that build was successful and all the errors were gone.
Also, I learnt that if you add each package manually then chances of errors will be high. best thing is to use maven package management, give it the package you want and then it will figure out all the dependancies that comes with it and download to your project. Also, this has nothing to do with jUnit version. Any decent recent version will do.
Hope this helps.

Answered By — Dilip Agheda