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There is a potentially big memory leak in Memory leak in org.netbeans.spi.debugger.ui.EditorContextDispatcher (48 instances of com.sun.tools.jdi.VirtualMachineImpl are held by it in the particular heap dump) see the second heap dump from comment #8 from umbrella issue for details
Heap dump is available at: http://netbeans.org/projects/profiler/downloads/download/Heapdumps/heapdump-213617.hprof.gz
The problem seems to be in listeners on action state changes.
Fixed by changeset: 223337:70ac56e642ba http://hg.netbeans.org/main/rev/70ac56e642ba I've also found a leak in RemoteServices.remoteServiceClasses - issue #213676
Integrated into 'main-golden', will be available in build *201206070001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/70ac56e642ba User: mentlicher@netbeans.org Log: #213617: Prevent from holding ActionsManager from action providers.