Byteman and static code injection. How to inject to class file?

byteman_ask Oct 24, 2019 7:24 AM

Hello. I have read a lot about dynamic code injection using Byteman.

But is it possible to inject code to class files permanently? I would like to inject some code to Java compiled class file and save changed file it in another location. How can I do that?

Kind regards,

byteman user.

1. Re: Byteman and static code injection. How to inject to class file?

adinn Oct 24, 2019 8:58 AM (in response to byteman_ask)

Hi,
byteman_ask wrote:

But is it possible to inject code to class files permanently? I would like to inject some code to Java compiled class file and save changed file it in another location. How can I do that?

Sorry, I am afraid you cannot do that with Byteman. The changes it makes only work in the current JVM.

I don't know of any other tools that make it easy to do what you are asking unless you understand a lot about Java bytecode. Perhaps ByteBuddy will work? I don't really know it very well so I cannot say for certain. Otherwise you will need to look at bytecode rewriting tools like ASM or Javassist.

regards,

Andrew Dinn
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2. Re: Byteman and static code injection. How to inject to class file?

byteman_ask Oct 25, 2019 10:16 AM (in response to adinn)

Oh, that's a shame. For editing bytecode I'm mostly using Recaf (Releases · Col-E/Recaf · GitHub ) or JBE (JBE - Java Bytecode Editor ).
I thought that Bytaman can automatize some actions for me, but not in this case I suppose.
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