Dear all Java gurus,

Is there a way to disassembly a .jar file. How to see what are the classes
inside the .jar file; what are the methods available, and the calling
convention to those mothod functions?

Is there such a debugger or disassembler in Java?

thanks a lot

lucy wrote:

> Dear all Java gurus,
> 
> Is there a way to disassembly a .jar file. How to see what are the classes
> inside the .jar file; what are the methods available, and the calling
> convention to those mothod functions?
> 
> Is there such a debugger or disassembler in Java?
> 
> thanks a lot

List jar contents:

jar -t filename.jar

Extract a named file:

jar -x filename.jar (name)

Extract all:

jar -x filename.jar

-- 
Paul Lutus
http://www.arachnoid.com

lucy wrote:

> Dear all Java gurus,
> 
> Is there a way to disassembly a .jar file. How to see what are the classes
> inside the .jar file; what are the methods available, and the calling
> convention to those mothod functions?
> 
> Is there such a debugger or disassembler in Java?
> 
> thanks a lot
> 
> 

See http://java.sun.com/j2se/1.4.2/docs/tooldocs/tools.html

Particularly the jar and javap tools.

HTH,
Carl.

In addition to using the jar commandline, if you're using an IDE (like Sun
One Studio, etc.), you can mount the jar file and expand it in a tree
structure to see all of it's classes, fields, method signatures, etc.
visually.

"lucy" <losemind@yahoo.com> wrote in message
news:cgj5q8$lgj$1@news.Stanford.EDU...
> Dear all Java gurus,
>
> Is there a way to disassembly a .jar file. How to see what are the classes
> inside the .jar file; what are the methods available, and the calling
> convention to those mothod functions?
>
> Is there such a debugger or disassembler in Java?
>
> thanks a lot
>
>

Hi,
The simple answer is yes. I do not know of a tool that will decompile the
classes from the jar (but it may be out there). If you unzip or extract
using jar -x so you have class files, then you can use jad to decompile.
Also Jedit has a plugin that will use Jode, within the Jedit IDE.
You could build a tool that would read the jar (see java.util.jar) and then
stream the stuff to Jode, and for all I know this may exist as a plugin to
Jedit. Jode is written in Java with source, Jad is C.

This will work on 99% of the stuff out there. A few people have encrypted
the class files, and provide a class loader that knows how to decrypt the
files. Having written one of these encryption tools I would point out they
are not that secure.Just note that by using Jode/Jad you may be breaking a
copyright or other legal agreements, so don't publish the code you obtain
this way, it almost always is illegal. There are a few books that discuss
this, if you just want to hack then "Covert Java" is pretty interesting and
while written on a basic level the author (Alex Kalinosky) does address some
very interesting problems, but not for the OO crowd.

Howie

"lucy" <losemind@yahoo.com> wrote in message
news:cgj5q8$lgj$1@news.Stanford.EDU...
> Dear all Java gurus,
>
> Is there a way to disassembly a .jar file. How to see what are the classes
> inside the .jar file; what are the methods available, and the calling
> convention to those mothod functions?
>
> Is there such a debugger or disassembler in Java?
>
> thanks a lot
>
>

As someone said, jad is good. I would use winzip & extract all the
class files into some directory and then run jad from dos on them.

--------------------------------------------
Answers to your java questions
http://java-questions.pattonwebsolutions.com
--------------------------------------------

"lucy" <losemind@yahoo.com> wrote in message news:<cgj5q8$lgj$1@news.Stanford.EDU>...
> Dear all Java gurus,
> 
> Is there a way to disassembly a .jar file. How to see what are the classes
> inside the .jar file; what are the methods available, and the calling
> convention to those mothod functions?
> 
> Is there such a debugger or disassembler in Java?
> 
> thanks a lot

On Tue, 7 Sep 2004 03:58:47 +0800, Smith wrote
(in article <a117c62d.0409061158.2246b41b@posting.google.com>):

> As someone said, jad is good. I would use winzip & extract all the
> class files into some directory and then run jad from dos on them.
> 
> --------------------------------------------
> Answers to your java questions
> http://java-questions.pattonwebsolutions.com
> --------------------------------------------
> 
> "lucy" <losemind@yahoo.com> wrote in message 
> news:<cgj5q8$lgj$1@news.Stanford.EDU>...
>> Dear all Java gurus,
>> 
>> Is there a way to disassembly a .jar file. How to see what are the classes
>> inside the .jar file; what are the methods available, and the calling
>> convention to those mothod functions?
>> 
>> Is there such a debugger or disassembler in Java?
>> 
>> thanks a lot

nar, if you want to be blown away by a good  decompiler, that can find dead 
code,  and handle messed up class files you need

djdec377.zip


just do a search on the internet