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Build: NetBeans IDE 6.8 Beta (Build 200910212001) VM: Java HotSpot(TM) Client VM, 14.1-b02, Java(TM) SE Runtime Environment, 1.6.0_15-b03 OS: SunOS, 5.11, x86 User Comments: GUEST: Java web application in debug mode. I applied F7 (step into) inside Java code. anba: I added a new static method during debugging and the used Debug > Apply Code Changes for the changed class Stacktrace: com.sun.jdi.InternalException: Unexpected JDWP Error: 23 at com.sun.tools.jdi.JDWPException.toJDIException(JDWPException.java:47) at com.sun.tools.jdi.ReferenceTypeImpl.methods(ReferenceTypeImpl.java:452) at com.sun.tools.jdi.ReferenceTypeImpl.getMethodMirror(ReferenceTypeImpl.java:84) at com.sun.tools.jdi.LocationImpl.method(LocationImpl.java:85) at org.netbeans.modules.debugger.jpda.jdi.LocationWrapper.method(LocationWrapper.java:214) at org.netbeans.modules.debugger.jpda.models.CallStackFrameImpl.canPop(CallStackFrameImpl.java:686)
Error: 23 means INVALID_METHODID. Apply Code Changes is unfortunately very buggy, you'll better not use it when you really do not have to.
Reducing to P4 - seems like a very rare JDK defect.
JDK error => WONTFIX.