Nullpointerexception in SOAPElementSerializer.init on heavy load

Question

Hello,
I'm running my webservices on a stand alone OC4J container.
When i execute 1 service, everything works fine.
When i use JMeter and execute twice the same service, in 1 thread i get a nullpointer exception on
Project project = XMLProjectReader.read("MyProject.xml", this.getClass().getClassLoader());
I defined my init method in my serializer as follows :
public synchronized void init(Map prop) {
try {
Project project = XMLProjectReader.read("MyProject.xml",
this.getClass().getClassLoader());
XMLContext xmlContext = new XMLContext(project);
unmarshaller = xmlContext.createUnmarshaller();
marshaller = xmlContext.createMarshaller();
soapFactory = SOAPFactory.newInstance();
} catch (Throwable e) {
     LOGGER.logAlert(Severity.CRITICAL, Constants.FAIL.getStatusCode());
I synchronized the method, so i would think that threads are not the problem here.
Anyone any idea what is causing the nullpointer ?
Chris.

Answer 1

Hello Jan,
Unfortunately not, as Oracle is leaving once again in the dark here....
They catch the exceptinon themselves , and then throw another one of their great errors :
2007-09-24 09:14:49.849 ERROR OWS-04046 Caught exception while handling request: java.lang.NullPointerException java.lang.NullPointerException
My guess is that some code is not threadsafe , so the xml file is read simultaneous by different threads, probably trying to create some singlton object containing the xml data. But even when i synchronise the method, the problem still remains...
Chris.