Hi Werner,
I found the problem by adding System.outs to ClassDescriptorResolverImpl
around line 279:
try {
ClassLoader loader = type.getClassLoader();
Class dClass = loadClass(className, loader);
classDesc = (XMLClassDescriptor) dClass.newInstance();
_cacheViaClass.put(type, classDesc);
System.out.println("Thread[" +
Thread.currentThread().getId() +"] class WAS found: " + className);
}
catch(ClassNotFoundException cnfe) {
System.out.println("Thread[" +
Thread.currentThread().getId() +"] class not found: " + className + ": "
+ cnfe.getMessage());
cnfe.printStackTrace();
/*
This is ok, since we are just checking if the
Class exists...if not we create one.
*/
}
I found that one thread got a ClassNotFoundException for a descriptor
class and the other thread got an instance of the exact same class.
Thread[9] class not found: com.stargus.ws.api.ResponseBodyDescriptor:
com.stargus.ws.api.ResponseBodyDescriptor
...
Thread[8] class WAS found: com.stargus.ws.api.ResponseBodyDescriptor
Thread[8] end of ClassDescriptorResolverImpl.resolve
...
Thread[9] end of ClassDescriptorResolverImpl.resolve
That coupled with the fact that I couldn't reproduce the problem outside
of tomcat makes me pretty sure tomcat is the cause.
-----Original Message-----
From: Werner Guttmann [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 02, 2006 11:55 AM
To: [email protected]
Subject: Re: [castor-user] RE: Null pointer while unmarshalling xml to
generated classes
Thanks, Dan, for letting us know. Having said that, I'd really like to
learn how you came about to realize that Tomcat is the problem, indeed.
Thanks
Werner
Smith, Daniel wrote:
> I found the cause of my null pointer. It's actually caused by a bug in
> the tomcat classloader:
> http://issues.apache.org/bugzilla/show_bug.cgi?id=33743. One of the
> threads gets a ClassNotFoundException trying to load one of my
generated
> descriptor classes in ClassDescriptorResolverImpl.resolve. It goes on
to
> use introspection, but something must be in an invalid state.
>
>
> -Dan
>
> -----Original Message-----
> From: Smith, Daniel
> Sent: Monday, May 01, 2006 2:42 PM
> To: '[email protected]'
> Subject: Null pointer while unmarshalling xml to generated classes
>
> Hi,
>
> I'm getting a null pointer exception when unmarshalling xml to classes
> generated from using the source generator. This exception only happens
> if two threads are trying to unmarshal a document at the same time.
One
> of the threads will succeed and one will fail with this exception. As
> far as I can tell it only happens the first time I try this after I
> start the JVM. After the initial error everything works fine. I'm
using
> castor 1.0.
>
> I'm using the static Unmarshaller.unmarshal(Class, Node) method.
>
> Here's the stack trace:
> java.lang.NullPointerException
> at
>
org.exolab.castor.xml.UnmarshalHandler.endElement(UnmarshalHandler.java:
> 757)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:249)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:182)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.processChildren(DOMEventProd
> ucer.java:333)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:247)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:182)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.processChildren(DOMEventProd
> ucer.java:333)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:247)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:182)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.processChildren(DOMEventProd
> ucer.java:333)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:247)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.process(DOMEventProducer.jav
> a:182)
> at
>
org.exolab.castor.xml.util.DOMEventProducer.start(DOMEventProducer.java:
> 110)
> at
> org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:584)
> at
> org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:735)
> at
> org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:848)
> at
>
com.stargus.ws.DanTestWebServiceInput.processRequest(DanTestWebServiceIn
> put.java:82)
> at
>
com.stargus.ws.DanTestWebServiceInput.access$0(DanTestWebServiceInput.ja
> va:75)
> at
>
com.stargus.ws.DanTestWebServiceInput$1.run(DanTestWebServiceInput.java:
> 55)
>
>
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