Add standard exports to the java client.

Don't include memory for now, it is non-trivial to get
cross platform.
The heap initial size measurement is specious at best.  If you build a Java server properly, you want to focus on strictly committed and used.  I suggest dropping "initial" unless a concrete need ever justifies including it.  "Max" falls into this category, too, but has more value than initial, so I would keep that one.