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This bug was originally marked as duplicate of bug 202834, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 20120608-8a3b0348bae1) VM: Java HotSpot(TM) 64-Bit Server VM, 21.0-b17, Java(TM) SE Runtime Environment, 1.7.0-b147 OS: Linux Stacktrace: java.lang.IllegalArgumentException: Unknown type 'javax.swing.border.CompoundBorder' at org.netbeans.modules.debugger.jpda.visual.JavaComponentInfo$ComponentProperty.setValueLazy(JavaComponentInfo.java:664) at org.netbeans.modules.debugger.jpda.visual.JavaComponentInfo$ComponentProperty.access$900(JavaComponentInfo.java:479) at org.netbeans.modules.debugger.jpda.visual.JavaComponentInfo$ComponentProperty$3$1.run(JavaComponentInfo.java:751) at org.netbeans.modules.debugger.jpda.visual.RemoteServices$1.breakpointReached(RemoteServices.java:277) at org.netbeans.api.debugger.jpda.JPDABreakpoint.fireJPDABreakpointChange(JPDABreakpoint.java:293) at org.netbeans.api.debugger.jpda.JPDADebugger.fireBreakpointEvent(JPDADebugger.java:458)
Created attachment 120732 [details] stacktrace
I have problems to reproduce this. Looks like some rare race-condition between the r/w state of the property and it's value. Does not look like something severe.
Reported for 7.3.x or earlier, no new info since then -> closing as worksforme, please reopen in case you see it.