Portal Service - java.lang.NoClassDefFoundError

Question

Hi all,
I've a Web Dynpro project which uses a portal service we wrote.
I added the service's name to the "Sharing References" of the project and the project runs.
However, after each restart to the server I get 'java.lang.NoClassDefFoundError' for the portal service. Redeploying the service solves the problem until next restart...
After doing a lot of checking I've came to the conclusion that the problem is in the initialization of the service in the component controller.
The component controller has 3 methods. In each of this methods the service is called
ISqlService sqlservice = (ISqlService)WDPortalUtils.getServiceReference(ISqlService.KEY);
After commenting this lines and moving the initialization line to "begin others" segment the problem seems to be solved (I've done some restarts to the server and the application ran without a problem)
My question is: if none of the methods of the controller is called on application startup then why do I get the java.lang.NoClassDefFoundError?
Also, when does the Web Dynpro framework load the portal service? isn't it supposed to be first time the service is called?
Regards,
Omri

Answer 1

Hi Umesh,
Try declaring a runtime reference for the service you are using in the project properties.
Please explore the options:
Project properties -> WebDynpro References -> Service References & Sharing References
For ex:In my application, i use KM functionality.Even though Ive KM jars in the classpath (as external lib DCs), I mentioned a runtime reference in "Sharing References" as PORTAL:sap.com/com.sap.km.application.
Similarly, I remember seeing somewhere mentioning the service you're trying to access as a Service Reference in the DC properties.
something like: PORTAL:mycompany.com/com.....MyService
A common portal service that is used in WebDynpro DCs is URLGenerator service. Probably if you search on it, you might find a clue.
Regards,
Rajit Srinivas