Java SE (Java Platform, Standard Edition)

I am currently a college student for programming and I know programming very well, but for this current task, I am completely stuck. This is not a school project or work, just a personal project I'm working on at the moment to learn more about Java.
What I am trying to create is a VST (Virtual Studio Synthesizer) using Java for use in music programs such as FL Studio, Sonar, Ableton, and so on. I did alot of Googling and found the following program:
[http://jvaptools.sourceforge.net/index.html]

I got it working, but it's not quite what I am looking for (it's more like an on-site editor that you enter code into and then run it). I want to create a VST from scratch and learn what each thing means in the program. I've done some research on MIDI input and output and found the following in the Java documentation:
[http://java.sun.com/javase/6/docs/api/javax/sound/midi/MidiDevice.html]

I figured I'm on track of what I'm looking for, but the problem is that the Java documentation simply sucks. It has no examples of code, how the functions work, and how I'm suppose to use them.
First off, I want to start with the extreme bare basics. Is it even possible to do a VST in JUST Java? I've seen and used examples of obtaining data from a MIDI file and playing it, but that's not what I'm trying to do. Second, how would I take MIDI data from a music program running the VST and enter the data into a text box? Once I'm able to do that, I should be able to work with the data to produce audio output.

My program I am attempting to make is a guitar synthesizer that I can run in music programs as a VST. If anyone around here knows anything about MIDI and VST plugins, please, post some example code and help point me in the right direction to creating something. I'm not looking to use other people's programs or code, I want to make something myself from scratch but I don't know where to start!