Hello
First check whether the RFC from SAP BW ABAP to the BI Java is setup properly and as a registered server program.
There should a JCo RFC on the Java side pointing to the ABAP side setup up with the program ID and started.
Ensure that the user ID maintained in the JCo RFC at the Java side has the correct authorisations.
For the Web Services you need to configure the the J2EE Server Access Information in Tx SOAMANGER - System Global Settings.
Good Luck
RB