Problems with sendReceiveNonBlocking - NullPointerException

[Andi Waltl <an...@mytum.de>]

Hi, 

i have a problem with an asynchronous call with two connections. 

My Client looks like this: 
... 
configurationContext = ConfigurationContextFactory
.createConfigurationContextFromFileSystem(repositoryPath, axis2xml); 
serviceClient = new ServiceClient(configurationContext, null); 

serviceClient.engageModule(new QName(
org.apache.axis2.Constants.MODULE_ADDRESSING)); 



 

Options options = new Options(); 
options.setTo(endpointReference); 
options.setUseSeparateListener(true); 
options.setTransportInProtocol("http"); 
options.setAction("urn:listenForValues"); 
serviceClient.setOptions(options); 


Callback callback = new Callback() { 
public void onComplete(AsyncResult result) { 
System.out .println("[WebServiceClient] Receiving…:\n" 
+ result.getResponseEnvelope().getBody() 
.getFirstElement()); 
} 
public void onError(Exception e) { 
e.printStackTrace(); 

} 
}; 
OMFactory factory = OMAbstractFactory.getOMFactory(); 
serviceClient.sendReceiveNonBlocking( 
createDummyOMElement("myElement"), callback); 

public static OMElement createDummyOMElement(String opName) { 
OMFactory fac = OMAbstractFactory.getOMFactory(); 
OMNamespace omNs = fac.createOMNamespace("http://myns.de", "ns1"); 
OMElement method = fac.createOMElement(opName, omNs); 
OMElement value = fac.createOMElement("myValue", omNs); 
value.addChild(fac.createOMText(value, "Hello again")); 
method.addChild(value); 
return method; 
} 

Okay, now a service is called and i can watch the first interaction in tcp
monitor with an empty http response body. 

Until now, everything seems to be as it should.
Then my client is starting a SimpleHttpServer on port 8088 (configured in
axis2.xml). 

Then my Service is invoked: 

public OMElement listenForValues(OMElement listenForValuesRequest) { 
return getTestReply(); 

} 

private static OMElement getTestReply() { 
OMFactory factory = OMAbstractFactory.getOMFactory(); 
OMElement element = factory.createOMElement(new QName("testElement")); 
element.setText("TestContent"); 
return element; 
} 

And before the service sends a response, an exception is thrown: 
Exception in thread "Axis2 Task" java.lang.NullPointerException 
at
org.apache.axis2.receivers.AbstractInOutAsyncMessageReceiver$1.handleResult(
AbstractInOutAsyncMessageReceiver.java:39) 
at
org.apache.axis2.receivers.AbstractInOutAsyncMessageReceiver$2.run(AbstractI
nOutAsyncMessageReceiver.java:67) 
at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run
Task(ThreadPoolExecutor.java:665) 
at
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run
(ThreadPoolExecutor.java:690) 
at java.lang.Thread.run(Unknown Source) 

I don´t know what i am doing wrong and unfortunately spent lots of hours on 
this problem. My service is, of course, configured with a
RawXMLINOutAsyncMessageReceiver. But the service itself sends no answer to
the 
callback handler in a second connection. 

Any ideas to solve the problem? 

Thanks in advance! 
Andi