java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util.HashMap$KeyIterator.next(HashMap.java:828) at org.netbeans.modules.cnd.modelimpl.impl.services.TypeHierarchyResolverImpl.getSubTypes2(TypeHierarchyResolverImpl.java:140) at org.netbeans.modules.cnd.modelimpl.impl.services.TypeHierarchyResolverImpl.getSubTypes2(TypeHierarchyResolverImpl.java:124) at org.netbeans.modules.cnd.modelimpl.impl.services.TypeHierarchyResolverImpl.getSubTypes(TypeHierarchyResolverImpl.java:91) at org.netbeans.modules.cnd.api.model.services.CsmVirtualInfoQuery$Empty.getOverriddenMethods(CsmVirtualInfoQuery.java:241) at org.netbeans.modules.cnd.refactoring.plugins.CsmWhereUsedQueryPlugin.processOverridenMethodsQuery(CsmWhereUsedQueryPlugin.java:300) at org.netbeans.modules.cnd.refactoring.plugins.CsmWhereUsedQueryPlugin.doPrepareElements(CsmWhereUsedQueryPlugin.java:144) at org.netbeans.modules.cnd.refactoring.plugins.CsmWhereUsedQueryPlugin.prepare(CsmWhereUsedQueryPlugin.java:109) at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:422) at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:406) at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:217) at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:807) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)