Create the actual agent update code. This is the code that is run when the agent update binary is self-executed via "java -jar agent-update.jar". It will have the responsibliilty of extracting the new agent distribution and laying it down on the filesystem.  It must ensure that it copies over the necessary files from the original agent and purge files that are no longer needed or part of the new agent.

for more info see http://support.rhq-project.org/display/RHQ/Design-AgentAutoUpdate