java bytecode editor? [closed]

What's a good free bytecode editor? I want an editor, something with a GUI...

I tried jbe-0.1b with no luck (can't save the bytecode changes).

Solution 1:

Nothing decent with a UI, but you can use the Eclipse Bytecode Outline plugin to turn any Java class into ASM code, edit it, and produce the changed class. It's probably the most painless way at the moment.

http://asm.ow2.org/eclipse/index.html

Solution 2:

I understand jasmin and jasper are the usual pair used to translate between bytecode and an assemly language representation.

IIRC, Apache BCEL comes with a tool to disassemble class files to code which creates the class file with BCEL.

I've used vi. :)