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Axis2 Interface Reference Variable Instantiationexception  RSS feed

 
Lee Miller
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Hi Everyone.

Web Services newbie question; seems so basic, but I can't find a similar thread...

We are using Axis2 to expose existing java code as web services. We are using the WSDL created automatically by the web app.

We are having a problem calling any method which exposes a parameter which contains objects with interface reference variables. eg.

- PostCodeConcrete implements PostCodeInterface
- Address Object contains a member variable of PostCodeInterface declared as PostCodeInterface p = new PostCodeConcrete();
- Another class exposes a method whose signature contains Address; eg. getPersonFromAddress( Address a ) on which the WSDL is based.

The client call to the webservice works fine from a JUnit test client. But when I try to test from a vb.net client I get an "java.lang.Instantiationexception". The code works from vb.net when I remove the interface reference variables, but as our code is existing, I would rather not re-write the entire system.

I ran the soapmonitor applet and the difference in the soap message is that the java client passes in a concrete type attribute for the parameter, so even though an interface is passed the SOAP message is telling Axis2 what concrete class to instantiate. Vb.net does not pass in a type parameter, and I guess Axis2 is trying to instantiate an interface, hence the exception.

We would like to implement webservices to expose our java code to our vb.net code, but this is causing us a headache. As the major benefit of web services is platform interoperability, I am sure that the solution must be really simple.

Thanks in advance for any help.
 
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