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java.lang.OutOfMemoryError: GC overhead limit exceeded at java.util.HashMap$KeySet.iterator( at java.util.HashSet.iterator( at$ at java.util.AbstractCollection.addAll( at java.util.HashSet.<init>( at at at at at omero.cmd.graphs.Delete2I.step( at omero.cmd.HandleI.steps( at omero.cmd.HandleI$1.doWork( at omero.cmd.HandleI$1.doWork(