Is it possible to set breakpoints at a specific bytecode instruction?

Question

I'm using jdb to remotely debug a Java application of which I don't have the source code. Furthermore, the application jars are obfuscated.

I can set method breakpoints but, is it possible to set breakpoints at a specific bytecode instruction within a method? The idea I have is to use some disassembler like javap to identify the interesting instructions.

Can jdb or other Java debugger do this?

score 0 · Accepted Answer · answered Jul 31 '13 at 20:21

0

You need line numbers to breakpoint on (something I assume has been removed). You can artificially add line numbers to the file using instrumentation and you will be able to breakpoint at every instruction if you wish.

answered Jul 31 '13 at 20:21

Peter Lawrey

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Yes, the line numbers have been stripped. Do you know any tool I can use to add "artificial" line numbers to the bytecode? – danidiaz Jul 31 '13 at 20:29
Not easily. I would use ASM to do it. – Peter Lawrey Jul 31 '13 at 20:32

Is it possible to set breakpoints at a specific bytecode instruction?

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