XML transformation problems - URGENT!!!!!

Question

Hi,
I have a problem on writing data into XML files on Win NT/Tomcat platform from a servlet. This problem has been getting on my nerves for the past few weeks now. It was earlier giving a SecurityException: sealing violation error, when trying to write into the XML file using the Transformer object's transform method. What I need to do is, just read in data from the XML file first, do some processing and then dump in the results back in the same XML file.
I managed to get rid of the Sealing violation exception now, by downloading the xalan2 package and giving the reference of the new xalan.jar in the classpath. I am using the JAXP Transformer class's transform method to change the XML document. But, the problem now is that it is throwing a NoSuchMethodError exception on the line where the transform(source, result) method is coded.
This is the source code:
private void writeXMLData(Node n) throws IOException
     Transformer transformer;
     StreamResult streamresult;
     DOMSource domsource;
     TransformerFactory factory;
     factory= TransformerFactory.newInstance();
     try
     transformer = factory.newTransformer();
     domsource = new DOMSource(n);
transformer.transform(domsource, new javax.xml.transform.stream.StreamResult(new                FileOutputStream("d:\\tomcat\\webapps\\ROOT\\Orders.xml")));
     catch (Exception e)
          e.printStackTrace();
transformer = null;
factory=null;
domsource= null;
streamresult=null;
This is the error that is thrown:
java.lang.NoSuchMethodError: org.w3c.dom.Node: method getNamespaceURI()Ljava/lang/String; not found
     at org.apache.xpath.DOM2Helper.getNamespaceOfNode(DOM2Helper.java:348)
     at org.apache.xml.utils.TreeWalker.startNode(TreeWalker.java, Compiled Code)
     at org.apache.xml.utils.TreeWalker.traverse(TreeWalker.java, Compiled Code)
     at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java, Compiled Code)
     at test.TestOrderAdd_proto.writeXMLData(TestOrderAdd_proto.java:427)
     at test.TestOrderAdd_proto.doPost(TestOrderAdd_proto.java:228)
     at test.TestOrderAdd_proto.doGet(TestOrderAdd_proto.java:246)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:402)
     at org.apache.tomcat.core.Handler.service(Handler.java:287)
     at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
     at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
     at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java, Compiled Code)
     at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java, Compiled Code)
     at java.lang.Thread.run(Thread.java:479)
The classpath settings are:
d:\jaxp-1.1\jaxp.jar;d:\xalan2\xalan-j_2_2_D9\bin\xalan.jar;d:\jaxp-1.1\crimson.jar (in that order)
Could anyone please help me out with this problem?
Thanks,
Jatin

Answer 1

I assume you're starting tomcat by using the tomcat.bat file. Keep in mind that this batch file adds every .jar file in tomcat's lib directory BEFORE your own classpath and it usually contains a parser.jar file, which might cause problems, it also contains a jaxp.jar.
If you want to switch to xerces, remove jaxp and crimson from your classpath and add xerces.jar to it (xerces contains jaxp). In the case of tomcat, you'd need to delete parser.jar and add xerces.jar to its lib dir.
Hope that helps.