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This bug was originally marked as duplicate of bug 228820, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.4 Beta (Build 201307092200) VM: Java HotSpot(TM) 64-Bit Server VM, 23.25-b01, Java(TM) SE Runtime Environment, 1.7.0_25-b15 OS: Linux User Comments: tomzi: Evaluating an expression in 'Evaluate Expression' Stacktrace: com.sun.jdi.VMMismatchException: instance of java.lang.Thread(name='main', id=1) at com.sun.tools.jdi.MirrorImpl.validateMirror(MirrorImpl.java:68) at com.sun.tools.jdi.ObjectReferenceImpl.invokeMethod(ObjectReferenceImpl.java:365) at org.netbeans.modules.debugger.jpda.jdi.ObjectReferenceWrapper.invokeMethod(ObjectReferenceWrapper.java:510) at org.netbeans.modules.debugger.jpda.expr.TreeEvaluator.invokeVirtual(TreeEvaluator.java:265) at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1060) at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1007)
Created attachment 139875 [details] stacktrace
Can you please provide some steps to reproduce? Do you have more than one debugger session running?
*** Bug 236041 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 231541 ***