Description John T.E. Timm 2011-10-18 12:49:09 EDT

Build Identifier: M20110210-1200

When using the XMLNSPrefixMap that is created in some XML Schema based Ecore models, I would like to selectively remove certain entries from the map by first getting an iterator on the entrySet and then using Iterator.remove(). Under certain circumstances, the entry returned by iterator.next() is null.

Reproducible: Always

Steps to Reproduce:
1. Create a new XMLTypeDocumentRoot instance using XMLTypeFactory
2. Add entries to its XMLNSPrefixMap
3. Get an iterator on entrySet
4. Iterate over entries and selectively remove using iterator.remove()

		XMLTypeDocumentRoot root = XMLTypeFactory.eINSTANCE.createXMLTypeDocumentRoot();
		EMap<String, String> map = root.getXMLNSPrefixMap();

		map.put("_1", "urn:hl7-org:v3");
		map.put("ns0", "http://www.openhealthtools.org/mdht/uml/cda/toc");
		map.put("ns1", "http://www.openhealthtools.org/mdht/uml/cda/hitsp");
		map.put("ns2", "http://www.openhealthtools.org/mdht/uml/cda/ccd");
		map.put("ns3", "http://www.openhealthtools.org/mdht/uml/cda/ihe");
		map.put("xsi", "http://www.w3.org/2001/XMLSchema-instance");
		map.put("ns4", "http://www.openhealthtools.org/mdht/uml/hl7/datatypes");

		System.out.println("entrySet size before: " + map.entrySet().size());
		System.out.println("entrySet before: " + map.entrySet());
		Iterator<Entry<String, String>> iterator = map.entrySet().iterator();
		while (iterator.hasNext()) {
			Map.Entry<String, String> entry = iterator.next();
			if (entry.getKey().equals("ns3")) {
				System.out.println("Attempting to remove: " + entry);
				iterator.remove();
				System.out.println("Successfully removed: " + entry);
			}
		}
		System.out.println("entrySet size after: " + map.entrySet().size());
		System.out.println("entrySet after: " + map.entrySet());

In this example, I add 7 entries to the prefix map. I would expect that when iterating over the entry set that every entry would be non-null but depending on what I select to remove, I sometimes get an NPE. The behavior also seems to depend on the cardinality of the entrySet. Odd cardinality fails, even cardinality succeeds.