Bug 258016 [PropertiesView] NPE in org.eclipse.ui.views.properties.PropertySheetViewer
At line 720. If the selection is null this will result in an NPE. Here is the offending code snippet: 714: // get the new selection 715: TreeItem[] sel = new TreeItem[] { selection }; 716: if (sel.length == 0) { 717: setMessage(null); 718: setErrorMessage(null); 719: } else { 720: Object object = sel[0].getData(); // assume single selection It would be better replaced with the following (sorry, no patch, I'm not set up for editing the platform!): // get the new selection TreeItem sel = new TreeItem[] { selection; if (selection == null) { setMessage(null); setErrorMessage(null); } else { Object object = selection.getData(); // assume single selection if (object instanceof IPropertySheetEntry) { // get the entry for this item IPropertySheetEntry activeEntry = (IPropertySheetEntry) object; // display the description for the item setMessage(activeEntry.getDescription()); // activate a cell editor on the selection activateCellEditor(selection); } } In fact, I'm not at all sure why the selection was being wrapped in a single element array at all, I'm guessing a holdover from old code?
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetViewer.java
}
                category.addEntry(childEntry);
            }
        }
        
        if (addMisc) {
			categoryCache.put(MISCELLANEOUS_CATEGORY_NAME, misc);
		}
        
        
        
        
        ArrayList categoryList = new ArrayList();
        Set seen = new HashSet(childEntries.size());
        for (int i = 0; i < childEntries.size(); i++) {
            IPropertySheetEntry childEntry = (IPropertySheetEntry) childEntries
                    .get(i);
            String categoryName = childEntry.getCategory();
            if (categoryName != null && !seen.contains(categoryName)) {
                seen.add(categoryName);
                PropertySheetCategory category = (PropertySheetCategory) categoryCache
                        .get(categoryName);
                if (category != null) { 
                    categoryList.add(category);
                }
            }
        }
        if (addMisc && !seen.contains(MISCELLANEOUS_CATEGORY_NAME)) {
            categoryList.add(misc);
        }