dumping JMX data

I appologize in advance for a noob question, just getting started with
kafka, and trying to get JMX data from it.

So, I had thought that running the JXMTool with no arguments would dump all
the data, but it doesn't seem to return.

I do know I can query for a specific Mbean name seems to work. But I was
hoping to dump everything.

I had a hard time finding any examples of using JMXTool, hoping someone
with some experience might be able to point me in the right direction.

Thanks in advance!