NotSerializableException accessing an EJB from a servlet

[kolthor]

Hi all,

I'm trying to call an EJB method from a servlet. The EJB methods work fine when I use a standalone test app, but die when I make the same calls from a servlet, throwing:

java.io.NotSerializableException: org.apache.catalina.connector.HttpRequestFacade
<stack trace snipped>

The servlet can create the EJB instance OK, it's not a lookup problem. The exception is thrown when I call a custom method in the servlet (it doesn't do anything, it's just a test stub). The remote interface method looks like:

public void process(HttpServletRequest reqest, HttpServletResponse response) throws RemoteException, java.io.NotSerializableException;

I'm currently using Tomcat 4 + JBoss 2.4.1 (seperately, not integrated), but had the same problem with Tomcat 3. The only fields in the Registration EJB are Strings - nothing fancy. I've stripped the bean 'bare' to try and isolate the problem, without success.

Despite much net searching I haven't seen any reports of similar problems - surely I'm not the only one? I'm running on Mac OS X 10.1 (Hotspot Java VM 1.3.1 for those who don't know).

Any suggestions/thoughts gratefully received.
Regards,
Andrew Wright

[starksm64]

Show the full stack trace

[kolthor]

Hi,

Thanks for the reply - I've just received an answer from somewhere else. Essentially the things that weren't serializable were the Tomcat HttpServletRequest and Response objects in the method signature - passing some other data structure is working fine. Simple when you know how :-/

Regards,
Andrew Wright

ps: the full stack trace was quite long - essentially it ran through the tomcat methods and then 'crossed over' into the EJB methods (from the EJB stub, presumably). Not really very helpful, other than telling me it was failing at the call to the EJB.