Hi ,
You are getting that build error because you have to prepare a library DC of MDM JAVA API and include that in the used DCs of your current GP DC.You cannot include jars in the build paty of a DC .Also refer the mdm java api at runtime in all the DCs using it under webdynpro refrences and you also need to make sure if MDM API sca is deployed on the engine.
Now coming back to integration there are few scenarios
a)Include all the reusable functions like getlookupdata,search value which you write in JAVA API in the GP DC only in the conmponent controller or make a helper file and include it in src->package
b)Make a webservice out of all APIs that you need and import the model.
There is no need to make two DCs .Keep one DC each for one use case like requester approver etc.and make a helper class in JAVA API and keep it in the src folder .
Only important thing is make a library Dc in the same track of MDM jars and include it in used DC then only you can build it not by including external jars.
In current NWDS I guess they have included the MDM jars in the track itself like builddt techjava etc
Thanks
Vinay
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