Error while using WindowBuilder.

[ZER0-ZER0-0NE]

I am getting this error "Eclipse is running under 23.02, but this Java project has a 25 Java compliance level, so WindowBuilder will not be able to load classes from this project. Use a lower level of Java for the project, or run Eclipse using a newer Java version." I have updated my IDE and installed latest JDK 25 support, I also have configure new java project to JRE 25 but still not working. How to resolve this issue?

[ptziegler]

Apologies for the delayed response. In total, there are two options:

1. You need to update the Java version the IDE is started with. This is not something that can't be configured in the Eclipse but has to instead be set via e.g. the JAVA_HOME environment variable on your system. Based on the error message, you are using Java 23 and not Java 25.

2. You need to lower the compiler level for your project via the properties (which you get by right-clicking on the project). There you can set the execution environment to a compatible Java version...

and also adapt the compiler compliance.