Sample WebDynpro for Java for BAPI error

Hi,
I have created one BAPI which will take matnr as an input and gives table of matnr, maktx.
This BAPI i have used (through Adaptive RFC) to create sample WebDynpro Application (JAVA) through NWDS.
I have deployed it and tried to run it, but it failed with following error.
500 Internal Server Error
Web Dynpro Container/SAP J2EE Engine/6.40
Failed to process request. Please contact your system administrator.
What could be the problem?
I have also tried sample application without any BAPI, It worked fine.
Please let me know what could be the possible error.
-Thanks

if its 500 Internal Server Error it would have created a DUMP on the ABAP side. check tcode ST22 in the ABAP engine to find more details.
Raja

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Message was edited by: Nitin Kamble

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