J2ME disassembler?

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Joseph - 20 May 2005 07:55 GMT

I recall that with java applets (bytecode) you can use a disassembler
to reverse compile and so output a source code .java file from any
.class file. Is this still true with J2ME bytecodes? Can you still
achieve the same effect?

What are some good disassembler for java ?

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Daniel Tahin - 20 May 2005 08:55 GMT

Hi,

I have used this Java SDK disassembler before:
http://kpdus.tripod.com/jad.html#download
This worked well. I don't know, perhaps it's ok for J2ME as well
(because J2ME uses the same compiler, or not?)...

Joseph schrieb:

> I recall that with java applets (bytecode) you can use a disassembler
> to reverse compile and so output a source code .java file from any
> .class file. Is this still true with J2ME bytecodes? Can you still
> achieve the same effect?
>
> What are some good disassembler for java ?

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Darryl Pierce - 22 May 2005 12:38 GMT

> I recall that with java applets (bytecode) you can use a disassembler
> to reverse compile and so output a source code .java file from any
> ..class file. Is this still true with J2ME bytecodes? Can you still
> achieve the same effect?

Yes, Bytecodes are bytecodes. The only difference is that with the MIDP
the bytecodes are preverified before being loaded onto the device.

> What are some good disassembler for java ?

Try JAD or javap.

Signature

Darryl L. Pierce <mcpierce@gmail.com>
Visit my homepage: http://mcpierce.multiply.com
"By doubting we come to inquiry, through inquiry truth." - Peter Abelard

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Joseph - 27 May 2005 16:08 GMT

> > I recall that with java applets (bytecode) you can use a disassembler
> > to reverse compile and so output a source code .java file from any
[quoted text clipped - 12 lines]
> Visit my homepage: http://mcpierce.multiply.com
> "By doubting we come to inquiry, through inquiry truth." - Peter Abelard

Because its preverified. Wouldn't that means java disassembler won't
be able to deal with it? as it requires pure bytecode. Does preverify
do anything to the bytecode? I know that it changes the size of my
compiled j2me.

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Darryl Pierce - 31 May 2005 01:38 GMT

>>>I recall that with java applets (bytecode) you can use a disassembler
>>>to reverse compile and so output a source code .java file from any
[quoted text clipped - 9 lines]
>
> Because its preverified.

So?

> Wouldn't that means java disassembler won't
> be able to deal with it? as it requires pure bytecode. Does preverify
> do anything to the bytecode? I know that it changes the size of my
> compiled j2me.

It does nothing to it that would bother the a decompiler. Have you
actually *tried* JAD yet?

Signature

Darryl L. Pierce <mcpierce@gmail.com>
Visit my homepage: http://mcpierce.multiply.com
"By doubting we come to inquiry, through inquiry truth." - Peter Abelard

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J2ME disassembler?

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