[News.eclipse.modeling.mddi] Getting a NullPointerException during Deser

[Stefan Dellmuth <sdellmuth@xxxxxxxxxxxxxxxx>]

Hi!

My name is Stefan Dellmuth. I'm from Germany and I'm using Eclipse MDDi 
for my project thesis. I have the following problem. I've created a 
simple ECore model that I want to send over the ModelBus. I flatten the 
model with the correspondig ModelUtil method and then call my service. 
The serialization just works fine and the SOAP request contains all my 
model elements. But during deserialization, before even one line of code 
of my service implementation is called, I get the following exception:

java.lang.NullPointerException
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.serialize.emf_xmi.DefaultModelSerializer.dereference(DefaultModelSerializer.java:215)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.marshal.ws.DefaultMarshaler.unmarshallSingleValue(DefaultMarshaler.java:281)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.marshal.ws.DefaultMarshaler.unmarshal(DefaultMarshaler.java:231)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.marshal.ws.DefaultMarshaler.unmarshal(DefaultMarshaler.java:482)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.server.ws.DefaultWsInvocationReceiver.readRequest(DefaultWsInvocationReceiver.java:130)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.server.ws.DefaultWsInvocationReceiver.process(DefaultWsInvocationReceiver.java:89)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.server.ws.ProviderEndPoint.execute(ProviderEndPoint.java:186)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.server.ws.EndPointManagerImpl.execute(EndPointManagerImpl.java:67)
	at 
org.eclipse.mddi.modelbus.adapter.infrastructure.transport.server.ws.axis.SimpleModelBusServer$MBAxisServer.invoke(SimpleModelBusServer.java:161)
	at 
org.apache.axis.transport.http.SimpleAxisWorker.execute(SimpleAxisWorker.java:428)
	at 
org.apache.axis.transport.http.SimpleAxisWorker.run(SimpleAxisWorker.java:155)
	at java.lang.Thread.run(Unknown Source)

I looked a little bit into the ModelBus code, but I couldn't grasp the 
problem. Why is this exception thrown? Is something wrong with my model 
or am I missing something important?

Best regards,
Stefan Dellmuth