How to embedd java in bpel?

I have taken 2 variables in xsd and created a small java program in the same soa project.
i want to embed java code in to BPEL and use the variables which i have created in XSD through getVariableData and after calculations the result should go back to XSD through setVariableData.
i m not able to get those functions. can anyone please help me?

Hi',
Check this out,
http://yatanveersingh.blogspot.com/2011/08/how-to-call-java-method-inside-bpel.html
-Yatan

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