![]() To change version of Java compiler for your project, uncheck “ Use compliance from execution environment…”, the you can choose Java version from the dropdown list as below: Change compiler compliance level from 1.8 to 11 – you will see a warning from Eclipse: This warning means that no compatible JRE for Java 11 configured in Eclipse. In the Properties dialog, navigate to Java Compiler section and you will see the following screen: To know Java compiler settings, right-click on the project and click Properties. You can have your Eclipse running under JRE 11 but the project is compiled with JRE 8.Now, suppose that you have a project that is set to compile with Java 1.8. That’s why it’s not necessarily to have JDK to use Eclipse - just JRE is enough.Note that the JRE that runs Eclipse IDE is not necessarily the one that is used by Eclipse compiler. Instead, Eclipse uses its own internal compiler to provide more advanced features like incremental compilation – for quickly compiling only small changes you have made – not recompile the full project.And Eclipse compiler requires JRE to run its compiled. ![]() You can skip the steps 1 and 2 if your project is already configured with JRE/JDK that supports the Java version to which you want to change.Before going into each step in details, I think it’s worth to understand some background information first.You know, JDK provides the javac tool for compiling Java source code but Eclipse doesn’t use javac.
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