Change Java Version in Eclipse IDE

How to change the Java version in Eclipse IDE? When we create a Java project inside the Eclipse IDE then that time we can assign the installed Java version, but we can also change after creating the project. Let us see how to do this. This can be done in the following steps,

  1. Check the Java version for the project in Eclipse IDE.
  2. Check available JRE in the Eclipse IDE.
  3. Add JRE (required Java version) to the Eclipse IDE.
  4. Change Java Version for the Project in Eclipse.
  5. Check Compiler Version for the Java Project.

Check Java Version

In the Project Explorer section, we can see the JRE System Library which is also displaying the current Java version of the Project.

Check Java version in Eclipse

In this project the current Java version is 13, but we need to change to the higher version Java 15. Let us see how to do it.

Check Available JRE in the Eclipse IDE

Before changing the Java version for a project, first, check the JRE installed in the current system. Go to Window => Preferences => Java => Installed JREs.

Check Available JRE in the Eclipse IDE

Currently, the Eclipse IDE is having the default JRE and JDK13 versions. To change the Java version, first, we need to add that Java version (with JRE) to the Eclipse IDE.

Add JRE to the Eclipse IDE

Click on “Add” to add the JRE, a new window will appear to ask the type of JRE. Here we will choose Standard VM.

Select JRE Type to Add JRE to Eclipse

Now, click on Directory, browse the Java home and add it to the Eclipse IDE. Based on the Java version, Eclipse IDE itself fetches the JRE name and JRE system libraries files. Click on Finish.

Add JRE to Eclipse

Adding JRE to the Eclipse IDE is completed. Now, our Eclipse IDE is having three installed JREs. Click on Apply and Close.

Change Java Version for the Project in Eclipse

Let us change the Java version for a particular Java project. Select Java project => right-click on it => Click on Build path => Configure Build Path.

change Java version in Eclipse

In the Libraries section, select the exiting JRE System Library and Remove it. After removing it, click on Add Libraries, and choose JRE System Library.

select JRE type in eclipse

Now, select the Java version and click on “Finish”.

Select Java version in Eclipse

Check Compiler Version for the Java Project

At last, check the correct compiler is configured or not? If not then change it. Select the Java project => Right-click => Build Path => Configure Build Path => Java compiler.

Check compiler version for the Java project

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