How to write Cross project plan query using java API

Hi

I have added my setup and scenariio ...Please let me know how to write a cross project plan query using java API

 Set up: Project area “A” with a change request 1, Project area “B” with a user story 1.1

Change request 1 has “Tracks” link to the user story 1.1

Use Case: If we have to query the change request - drill down to the linked story  - get the status and other attributes queried from the user story

IS There any java API where i can query through Different project Areas?