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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=17345 java.lang.RuntimeException: java.lang.NullPointerException while reuse TransformerHandler on pipe processing Summary: java.lang.RuntimeException: java.lang.NullPointerException while reuse TransformerHandler on pipe processing Product: XalanJ2 Version: 2.4 Platform: PC OS/Version: Windows NT/2K Status: NEW Severity: Normal Priority: Other Component: Xalan AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] I've got a process chaining two transformations by piping SAX events. I created Xalan wrapper which has to initialize Xalan and prepare everything for transformation of series of XMLs. Here is main methods of the wrapper below: public class PipeConverter { private SAXTransformerFactory saxTFactory; private XMLReader reader; private Serializer serializer; private TransformerHandler[] tHandlers; private StreamSource[] tSources; /** Inits main components */ public PipeConverter() throws Exception { saxTFactory = (SAXTransformerFactory)TransformerFactory.newInstance(); reader = XMLReaderFactory.createXMLReader(); serializer = SerializerFactory.getSerializer (OutputProperties.getDefaultMethodProperties("xml")); } /** * Reads and prepares content handlers. * @param _fileNames array of XSL file names */ public void setTemplates(String[] _fileNames) throws Exception { num = _fileNames.length; tSources = new StreamSource[num]; for(int i = 0; i < num; i++) { tSources[i] = new StreamSource(_fileNames[i]); } tHandlers = new TransformerHandler[num]; for(int i = 0; i < num; i++) { tHandlers[i] = saxTFactory.newTransformerHandler(tSources[i]); } reader.setContentHandler(tHandlers[0]); reader.setProperty("http://xml.org/sax/properties/lexical-handler";, tHandlers[0]); for(int i = 0; i < num-1; i++) { tHandlers[i].setResult(new SAXResult(tHandlers[i+1])); } tHandlers[num-1].setResult(new SAXResult(serializer.asContentHandler())); } /** * Transforms XML string. * @param */ public String transform(String _xmlSource) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { serializer.setOutputStream(baos); InputSource source = new InputSource (new ByteArrayInputStream(_xmlSource.getBytes())); reader.parse(source); } catch(Exception ex) { ex.printStackTrace(); } return baos.toString(); } /** * Test */ public static void main(String[] args) throws Exception { // Read source HTML files FileInputStream fis = new FileInputStream("file1.html"); byte[] content1 = new byte[fis.available()]; fis.read(content); String source1 = new String(content); // ...Same steps to read file content omitted... String source2 = new String(content); // Prepare array of templates String[] templates = new String[2]; templates[0] = "template1.xsl"; templates[1] = "template2.xsl"; // Create and init converter PipeConverter conv = new PipeConverter(); conv.setTemplates(templates); // Process conv.transform(source1); conv.transform(source2); // <-- NullPointerException } } First transformation executed successfully. Second transformation threw exception: java.lang.RuntimeException: java.lang.NullPointerException at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:524) at org.apache.crimson.parser.Parser2.parse(Parser2.java:305) at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:442) at epost.html.trax.PipeConverter.transform(PipeConverter.java:123) at epost.html.trax.PipeConverter.main(PipeConverter.java:181) If I recreate transformer handlers for the second transformation then it gets executed. So, I have to obtain new handlers from the SAX factory: "tHandlers[i] = saxTFactory.newTransformerHandler(tSources[i]);" But this is what I am trying to avoid in order to save time on transformation process. Why do transformation handler cannot be reused? It seems to me like a bug in a Xalan's SAX parser.
