Java reversing question

[Mkz]

A-gui.exe is a regular native application which launches a java process, much like you can launch java(w) itself using the command line.
With a tool such as Process Explorer you can see what the full command line is of the child javaw process so that perhaps you can even launch it manually, without having A-gui.exe do it.

The parent process is probably launching java with an API such as JNI_CreateJavaVM, see here: hxxp://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/invocation.html

You can debug both the parent and the child process with Olly, naturally, but if the child is javaw, you're better off reversing its classes or monitoring with things like JVisualVM or Mission Control.