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Not likely easy to reproduce. I am playing with opends.org sources but using a novel project type. Thrown while trying to display code completion on an import which appeared with no error message. It is quite possible that ClassPath and/or SourceForBinaryQuery information is incorrect in this case, but of course that should not cause a weird exception like this. SEVERE [global] java.lang.IllegalArgumentException: <E>java.util.EnumSet<E> at com.sun.tools.javac.model.JavacTypes.validateTypeNotIn(JavacTypes.java:291) at com.sun.tools.javac.model.JavacTypes.isAssignable(JavacTypes.java:98) at org.netbeans.modules.editor.java.Utilities.resolveMethod(Utilities.java:697) at org.netbeans.modules.editor.java.Utilities.fuzzyResolveMethodInvocation(Utilities.java:639) at org.netbeans.modules.java.hints.infrastructure.ErrorHintsProvider.handlePossibleMethodInvocation(ErrorHintsProvider.java:277) at org.netbeans.modules.java.hints.infrastructure.ErrorHintsProvider.getLine(ErrorHintsProvider.java:311) at org.netbeans.modules.java.hints.infrastructure.ErrorHintsProvider.computeErrors(ErrorHintsProvider.java:164) at org.netbeans.modules.java.hints.infrastructure.ErrorHintsProvider.run(ErrorHintsProvider.java:451) at org.netbeans.modules.java.hints.infrastructure.ErrorHintsProvider.run(ErrorHintsProvider.java:100) [catch] at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1651) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269) at java.util.concurrent.FutureTask.run(FutureTask.java:123) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675) at java.lang.Thread.run(Thread.java:595)
Max volunteered :)
Located in java/editor.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss