Confusing Java Versions in WSL2 with IntelliJ IDE

Abstract: Having trouble with conflicting Java versions while running WSL2 on IntelliJ IDE? This article provides guidance and solutions for resolving command line Java version issues, discussed in the context of "./mnt/c/Program Files/Java/j..." example.

Created: 2025-02-03 by UserComp.com Editors

Confusing Java Versions in WSL2 with IntelliJ IDE

If you are running IntelliJ IDE on WSL2 (Windows Subsystem for Linux version 2), you might have encountered issues with Java versions, especially when working with the command line. Common examples include typing <code>java.exe >/mnt/c/ProgramFiles/Java/j...</code> in the terminal.

Understanding Java Versions in WSL2

WSL2 runs a Linux distribution, such as Ubuntu, alongside Windows. When installing Java on WSL2, you usually install the OpenJDK or Oracle JDK package specific to the Linux distribution. These installations don't interfere with any Java installations on Windows.

However, IntelliJ IDE installed on Windows may use a different Java version than what you installed on WSL2. That is because IntelliJ IDE picks up the Java version available in the Windows %PATH% and %JAVA_HOME% variables, which may or may not point to the WSL2 Java installation.

Checking Java Versions in WSL2 and IntelliJ IDE

To check the Java version in your WSL2 Ubuntu terminal:


java -version

To check the Java version in IntelliJ IDE:

Open IntelliJ IDE.
Go to Help > Find Action.
Type Switch Boot JDK and press Enter.
The current Java version used by IntelliJ IDE will be displayed.

Updating Java Versions in WSL2 and IntelliJ IDE

To update the Java version in WSL2:

Update the Linux distribution's package manager.
Install the desired Java version, e.g., for Ubuntu:


sudo apt update
sudo apt install openjdk-11-jdk

To update the Java version in IntelliJ IDE:

Install the desired Java version on Windows, if not already installed.
In IntelliJ IDE, go to File > Settings.
Go to Build, Execution, Deployment > Build Tools > Gradle.
Update the Gradle JDK path to the new Java version on Windows.
Update the Project SDK and Language Level to the new Java version in the same Settings window.

Configuring Java Versions in WSL2 and IntelliJ IDE

To configure the Java version in WSL2:

Modify the PATH and JAVA_HOME variables in the WSL2 terminal.
Update the .bashrc or .zshrc file in your WSL2 home directory.

To configure the Java version in IntelliJ IDE:

Use the Switch Boot JDK option in IntelliJ IDE to switch between available Java versions as needed.

Running IntelliJ IDE on WSL2 can lead to confusion regarding Java versions. Understand the differences between Java installations on WSL2 and Windows. Check, update, and configure Java versions in both WSL2 and IntelliJ IDE as required.

References

Oracle JDK: https://www.oracle.com/java/technologies/javase-jdk11-downloads.html
OpenJDK: https://openjdk.org/
Gradle: https://gradle.org/install/

Tags: WSL2 IntelliJ Java Tech Support

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