[Hawkular-dev] hawkular java agent ready - itests passing

[John Mazzitelli]

OK, I have been feverishly finishing this up. I believe this PR is ready. We now have a java agent that can be used in the place of the agent subsystem.

https://github.com/hawkular/hawkular-agent/pull/302

All the unit tests and itests pass - I even have itests running against the javaagent so I can say its working at least as well as the agent as a subsystem. The itests are essentially a copy of the ones we have for the wildfly subsystem agent so I'm exercising the javaagent in the same ways.

Two caveats that I can think of:

1) you can't run javaagent inside host controller directly. You have to run it as a separate process (the javaagent can also run on in its own JVM via "java -jar hawkular-javaagent.jar - it does not HAVE to be attached to some other JVM) and point to the host controller remotely. If you want to run it inside Host Controller, use the Hawkular WildFly Agent as a subsystem (i.e. use it like you do now with the original agent).

2) The "local" DMR mode isn't really local - under the covers it is going through the remote management endpoint so long as the WildFly EAP is configured on the default 127.0.0.1:9990. If it is not, just configure the agent to talk to its local WildFly as if it were a remote-dmr managed server.

To solve 1 we need the host controller to incorporate this enhancement: https://issues.jboss.org/browse/WFCORE-2526

To solve 2 I need to play games with classloading and JBoss Modules - I was given some ideas from some folks. I plan to try something to get that to work.

This javaagent has JMX support. It talks local JMX API if local, and Jolokia REST if remote. It supports cmdgw websocket command ExecuteOperationRequest to invoke JMX operations (itests show this working). So we have full DMR and JMX support.

So this is ready for people to try out for non-EAP based products with JMX as their management interface. Tom Cunningham is testing now. He already spotted a packaging issue with sprintboot which he is figuring out - I'll let him explain if he has the energy :)

I think I can merge this soon, unless someone has reservations.

FWIW: the wildfly agent subsystem support remains intact and as it was. So that didn't change and works like it always has (its itests are still there and passing so I know I didn't break those :).