Is there a way to compile jar files to OS X binary code?

I made a java program which worked perfectly fine on java(it should..) but I encountered one problem which was the encryption of my project because I could easily decompile it with a jar-decompiler like jd-gui.

In my project I have a connection to my online MySQL database and to connect to it it needs the user, password and stuff. As I wanted to protect it I looked up ways to encrypt class files.

Basically I wan't to protect some data in the code.

I know about Zelix Klassmaster, Class-Loader(loading up encrypted class files) and Excelsior JET.

I am really happy with Excelsior JET, because the user does not need java!

There are multiple answers I would be happy about:

How to: String encryption etc. like Zelix Klassmaster

A way to hide the MySQL connection user data(username, table, password, host..) in the class file

An application which does the same thing like Excelsior JET just for MAC OS