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If I understand correctly, showing instances from Loaded Classes window works correctly only if the debugged VM is paused. However, there's no indication that the user should pause the VM before heapwalking, everything "seems" to work OK. I believe this is a serious usability problem and should be addressed in the UI for example by displaying some notification to pause the VM instead of opening Instances window.
The Instances window should be empty when debugger is running, with some description text and perhaps a Pause button.
An informational text is shown when the debugged application is not paused. /shared/data/ccvs/repository/debuggerjpda/profiler/heapwalk/nbproject/project.xml,v <-- project.xml new revision: 1.6; previous revision: 1.5 /shared/data/ccvs/repository/debuggerjpda/profiler/heapwalk/src/org/netbeans/modules/debugger/jpda/heapwalk/actions/ClassesCountsViewAction.java,v <-- ClassesCountsViewAction.java new revision: 1.4; previous revision: 1.3 /shared/data/ccvs/repository/debuggerjpda/profiler/heapwalk/src/org/netbeans/modules/debugger/jpda/heapwalk/views/Bundle.properties,v <-- Bundle.properties new revision: 1.5; previous revision: 1.4 /shared/data/ccvs/repository/debuggerjpda/profiler/heapwalk/src/org/netbeans/modules/debugger/jpda/heapwalk/views/InstancesView.java,v <-- InstancesView.java new revision: 1.9; previous revision: 1.8
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.