How to copy artifacts back to workspaces of upstream job?

[intelchen]

Hi all,
       There are two stage jobs for one java project.
One is to do compilation job and create a runtime jar file after polling 
codes from SCM.
Second one is to do findbug analysis job. It copy artifact(runtime jar 
file) from upstream using Copy Artifact Plugin. And there would be a 
findbug_result.xml generated after this job.