Java.lang.ClassCastException when calling webservice stub from oracle DB

Question

Hello everyone,
Because i need to get familliar with calling java webservices from an oracle database, i followed the following example
(http://www.oracle.com/technology/products/jdev/howtos/10g/WS_DBCallout/DBCalloutWS_HowTo.htm),
which included installing the SOAP client stack to the database (in the sys schema), grant the right permissions to the SYS user, developing a simple Helloworld webservice with jdeveloper 10.1.2, generating a Webservice stub and deploying a static method of this stub to the database.
All of this worked just fine, but when i want to call the webservice from oracle by invoking the deployed function, i get a java.lang.ClassCastException.
The complete stacktrace lists as follows:
v_Return = foutje: java.lang.ClassCastExceptionnulljava.lang.ClassCastException
     at org.apache.soap.rpc.RPCMessage.serializeParams(RPCMessage.java:323)
     at org.apache.soap.rpc.RPCMessage.marshall(RPCMessage.java:305)
     at org.apache.soap.Body.marshall(Body.java:148)
     at org.apache.soap.Envelope.marshall(Envelope.java:203)
     at org.apache.soap.Envelope.marshall(Envelope.java:161)
     at oracle.soap.transport.http.OracleSOAPHTTPConnection.send(OracleSOAPHTTPConnection.java:664)
     at org.apache.soap.rpc.Call.invoke(Call.java:261)
     at test.HelloWorldServiceStub.sayHello(HelloWorldServiceStub.java:82)
I debugged the WebServiceStub and noticed that the call.invoke method crashes. This is weird beacuse when i use System.out.println on the parameter is works just fine. so you would think it is a string.
Moreover, if i invoke the webservice from the endpoint or even when im debugging the stub locally it all works just fine.
Can someone plzzzzzz help me with this because i spend the whole day looking for an answer and im getting crazy!!!!!
Thanx al lot guys,
Kim
PS or could the problem be in the database instead of the webservice?????????
Message was edited by:
user568880
Message was edited by:
Kim Zeevaarders

Answer 1

I think that it's going wrong because i did not install the right SOAP client stack.
In the HowTo is specified what JAR files are to be loaded in the database (from %JDEV_HOME), but it states that it has only been tested on a Oracle 9.2 database. I'm using Oracle10g. Maybe that's the reason that im getting this classcast exception...
Can anybody tell me what the right .JAR files are that have to be loaded into database when working with Oracle 10g?
Many thx in advance!
Kim