Help me in JBuilderX+Weblogic7

I have a project which has run smoothly in Apusic(A J2EE server).Now I wanna to move it to JBX+Web7
platform.I’ve worked hard to rewriter the DTD and other XMLs.Now my component can visit each other,but when my EJB(session) wanna to visit my Database(MS access).It raise a Exception:Null Key not support. Why? I’ve set in ODBC and my JNDI is correct. Tell me how to config! Thankyou!