Bug 32531 NPE importing preferences
Build id: 200302211557 Got error messages when importing preferences. I couldn't reproduce the problem anymore. Will attach stack traces (two generated in a row). Top entries are: java.lang.NullPointerException at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.rootsAndC ontainers(PackageExplorerContentProvider.java:153) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getChildr en(PackageExplorerContentProvider.java:131) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.getFilteredChildre n(PackageExplorerPart.java:352) at org.eclipse.jface.viewers.StructuredViewer.getSortedChildren (StructuredViewer.java:555) at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren (AbstractTreeViewer.java:1282) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh (AbstractTreeViewer.java:925) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh (AbstractTreeViewer.java:934) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh (AbstractTreeViewer.java:895) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh (AbstractTreeViewer.java:881) at org.eclipse.jface.viewers.StructuredViewer$7.run(StructuredViewer.java:858) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection (StructuredViewer.java:798) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:856) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:818) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.propertyChange (PackageExplorerPart.java:1062)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
return true;
			} else 
				postRemove(resource);
		}
		if ((status & IResourceDelta.ADDED) != 0) {
			if (parent instanceof IPackageFragment) {
				
				postRefresh(internalGetParent(parent));	
				return true;
			} else
				postAdd(parent, resource);
		}
		
		if ((flags & IResourceDelta.OPEN) != 0) {
			postRefresh(internalGetParent(parent));
			return true;		
		}
		processResourceDeltas(delta.getAffectedChildren(), resource);
		return false;
	}
	
	void setIsFlatLayout(boolean state) {
		fIsFlatLayout= state;
	}
	/**
	 * Process resource deltas.
	 *
	 * @return true if the parent got refreshed
	 */
	private boolean processResourceDeltas(IResourceDelta[] deltas, Object parent) {