Program: 92006
Project: 92006
Buggy source:
@Override public Object execute(ExecutionEvent event) throws ExecutionException {
  IWorkbenchWindow window=PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  if (window == null) {
    return null;
  }
  IWorkbenchPage page=PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
  IWorkbenchPart part=page.getActivePart();
  if (part == null) {
    return false;
  }
  ISelectionProvider selectionProvider=part.getSite().getSelectionProvider();
  if (selectionProvider == null) {
    return false;
  }
  ISelection selection=selectionProvider.getSelection();
  if (selection instanceof TreeSelection) {
    TreeSelection sel=(TreeSelection)selection;
    Object element=sel.getFirstElement();
    List<IResource> resourcesList=new ArrayList<IResource>();
    if (element instanceof TmfExperimentElement) {
      TmfExperimentElement experiment=(TmfExperimentElement)element;
      IResource[] resources=experiment.getSupplementaryResources();
      resourcesList.addAll(Arrays.asList(resources));
      HashMap<IResource,TmfTraceElement> traceMap=new HashMap<IResource,TmfTraceElement>();
      for (      TmfTraceElement aTrace : experiment.getTraces()) {
        aTrace=aTrace.getElementUnderTraceFolder();
        resources=aTrace.getSupplementaryResources();
        resourcesList.addAll(Arrays.asList(resources));
        for (        IResource resource : resources) {
          traceMap.put(resource,aTrace);
        }
      }
      SelectSupplementaryResourcesDialog dialog=new SelectSupplementaryResourcesDialog(window.getShell(),resourcesList.toArray(new IResource[resourcesList.size()]));
      if (dialog.open() != Window.OK) {
        return null;
      }
      IResource[] resourcesToDelete=dialog.getResources();
      for (      IResource resource : resourcesToDelete) {
        traceMap.get(resource).closeEditors();
        try {
          resource.delete(true,new NullProgressMonitor());
        }
 catch (        CoreException e) {
          Activator.getDefault().logError("String_Node_Str" + resource,e);
        }
      }
      IResource resource=experiment.getProject().getResource();
      if (resource != null) {
        try {
          resource.refreshLocal(IResource.DEPTH_INFINITE,null);
        }
 catch (        CoreException e) {
          Activator.getDefault().logError("String_Node_Str" + resource,e);
        }
      }
    }
  }
  return null;
}

Fixed version (ground truth):
@Override public Object execute(ExecutionEvent event) throws ExecutionException {
  IWorkbenchWindow window=PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  if (window == null) {
    return null;
  }
  IWorkbenchPage page=PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
  IWorkbenchPart part=page.getActivePart();
  if (part == null) {
    return false;
  }
  ISelectionProvider selectionProvider=part.getSite().getSelectionProvider();
  if (selectionProvider == null) {
    return false;
  }
  ISelection selection=selectionProvider.getSelection();
  if (selection instanceof TreeSelection) {
    TreeSelection sel=(TreeSelection)selection;
    Object element=sel.getFirstElement();
    List<IResource> resourcesList=new ArrayList<IResource>();
    if (element instanceof TmfExperimentElement) {
      TmfExperimentElement experiment=(TmfExperimentElement)element;
      IResource[] resources=experiment.getSupplementaryResources();
      List<IResource> experimentResources=Arrays.asList(resources);
      resourcesList.addAll(experimentResources);
      HashMap<IResource,TmfTraceElement> traceMap=new HashMap<IResource,TmfTraceElement>();
      for (      TmfTraceElement aTrace : experiment.getTraces()) {
        aTrace=aTrace.getElementUnderTraceFolder();
        resources=aTrace.getSupplementaryResources();
        resourcesList.addAll(Arrays.asList(resources));
        for (        IResource resource : resources) {
          traceMap.put(resource,aTrace);
        }
      }
      SelectSupplementaryResourcesDialog dialog=new SelectSupplementaryResourcesDialog(window.getShell(),resourcesList.toArray(new IResource[resourcesList.size()]));
      if (dialog.open() != Window.OK) {
        return null;
      }
      IResource[] resourcesToDelete=dialog.getResources();
      for (      IResource resource : resourcesToDelete) {
        if (experimentResources.contains(resource)) {
          experiment.closeEditors();
        }
 else {
          traceMap.get(resource).closeEditors();
        }
        try {
          resource.delete(true,new NullProgressMonitor());
        }
 catch (        CoreException e) {
          Activator.getDefault().logError("String_Node_Str" + resource,e);
        }
      }
      IResource resource=experiment.getProject().getResource();
      if (resource != null) {
        try {
          resource.refreshLocal(IResource.DEPTH_INFINITE,null);
        }
 catch (        CoreException e) {
          Activator.getDefault().logError("String_Node_Str" + resource,e);
        }
      }
    }
  }
  return null;
}