@ In WLS, we discovered an issue when using a SchemaFactory from a different 
@ version of xerces than bundled with the JDK.  See bug 12962723 for details.   
@ Synopsis is as follows: 
@ . 
@ In Java 6, there is an NPE check( 
@     public void addRecognizedFeatures(String[] featureIds) { 
@ . 
@         // add recognized features 
@         int featureIdsCount = featureIds != null ? featureIds.length : 0; 
@         for (int i = 0; i < featureIdsCount; i++) { 
@             String featureId = featureIds[i]; 
@             if (!fRecognizedFeatures.contains(featureId)) { 
@                 fRecognizedFeatures.add(featureId); 
@             } 
@         } 
@ . 
@     } 
@ . 
@ But NPE check disappears in Java7 
@     public void addRecognizedFeatures(String[] featureIds) { 
@         fRecognizedFeatures.addAll(Arrays.asList(featureIds)); 
@     } // addRecognizedFeatures(String[]) 
@ . 
@ . 
@ This can be easily reproduced with the following test case. Run with JDK7 & 
@ nothing on the classpath, it passes.  Run with JDK7 and add xercesImpl.jar to 
@ the classpath & it fails with the error indicated in the bug. 
@ . 
@ import javax.xml.validation.Schema; 
@ import javax.xml.validation.SchemaFactory; 
@ import javax.xml.XMLConstants; 
@ import javax.xml.parsers.SAXParserFactory; 
@ . 
@ public class test { 
@     public static void main(String[] args) throws Exception { 
@         System.setProperty("javax.xml.parsers.SAXParserFactory", 
@                 
@ "com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl"); 
@         SAXParserFactory factory = SAXParserFactory.newInstance(); 
@         System.out.println(factory.getClass().getName()); 
@         Schema schema = SchemaFactory.newInstance( 
@                 XMLConstants.W3C_XML_SCHEMA_NS_URI).newSchema(); 
@         factory.setSchema(schema); 
@         factory.newSAXParser(); 
@ . 
@     } 
@ } 
@ .