java cracking

[marrom79]

There is rather a new tool, very similar to JBE (JBE is obsolete as it won't "patch" all .class files reliably when select features of java 1.6 are used) it's called DirtyJOE. In my opinion, its the easiest way/tool to reverse java. DirtyJOE has an Opcode library that will let you know what that particular java opcode or "bytecode instruction" signifies... http://dirty-joe.com/

I'm also happy to help... clarify and instruction or if you are simply looking for a way to do something...

As a decompiler, I recommend using DJ as it is very quick and simple... http://java.decompiler.free.fr/?q=jdgui

the basics to reverse java are...
1.Serch for the code to be patched with DJ;
2.Use winRAR and extract the .class file containing the "magic" section of code;
3.Get cracking with dirtyJOE.

For JNLP applications, you need first to dig out the relevant .jar files... they are all in the java cache folder...

marrom

[wassim_]

This is just an idea, I don't actually know much about Java but I do understand that Java code runs in a virtual machine (JVM) which is essentially a set of DLLs on windows, so shouldn't there be a way to set breakpoints directly in these DLLs while the virtual machine is interpreting and running a jar?
This could be useful for sniffing serials and the like for example...

[besoeso]

Dr. Garbage Tools is a suite of Eclipse Plugins released under Apache Open Source license. Before is comercial.

-Bytecode Visualizer

• inspect
• understand
• debug

-Sourcecode Visualizer

• review
• analyze
• teach & learn

-Control Flow Graph Factory

• generate
• edit
• export

http://www.drgarbage.com/index.html

[CRC32]

JBE is really a good program.
But as far as I can see it, you can not directly change the opcodes in the program.
Should I fool myself, let me know.

JBE or JEB? I have studied how to reverse apk for 20 days.I know a tool named JEB(a interactive android decompiler) also powerful.Are we talking about the same thing��If someone knows, tell me please. Thank you��