Portal data source

Hi Everybody,
   Can someone guide me as to how I can change my user data source from portal UME to the java database. as of now we have the portal UME connected to the abap system as it is a AS ABAP+AS JAVA installation. I beleive we need a xml file for that ? do we upload it in the system admin> system config > datasource or do we add it in the config tool ? if so where do we get that xml file ?
can someone please guide me here ???

Hi rahul ,
edit the properties UME.There is option for editing properties.

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