Is it necessary to install checker framework before I run its eclipse plugin?

Question

My console print some error when I open its preference dialogue in eclipse.

!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
java.lang.UnsupportedClassVersionError: org/checkerframework/checker/nullness/NullnessChecker

Any advise?

Thanks a lot.

Answer 1

You do not need to install the checker framework separately; it comes with the eclipse plugin.

It looks like you are running too old of a JVM. Java 7 or newer is required. You can check what eclipse is using by going to Help->About Eclipse->Installation Details->Configuration and looking for the eclipse.vm= property.