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From "Winnebeck, Jason" <>
Subject RE: Line numbers and debugging in method when branching
Date Thu, 25 Aug 2016 13:13:55 GMT
Thanks Jochen, I created for this issue.


-----Original Message-----
From: Jochen Theodorou [] 
Sent: Thursday, August 25, 2016 1:49 AM
Subject: Re: Line numbers and debugging in method when branching

On 24.08.2016 23:10, Winnebeck, Jason wrote:
> Consider the following class:
> *class *Debugging {
> *public static void *main(String[] args) {
> *a*: *if *(args.*length *> 0) {
> *b*: println *"args"
> *}
> }
> }
> And let's say that I run the program with no arguments, and I put 
> IntelliJ debugger to break on line a. Now when I "step next" I see it 
> highlight line b, then step next and the program ends. The line b 
> clearly did not run. Is this a problem with IntelliJ or the bytecode?
> Below is the bytecode for the method. I'm assuming the issue is that 
> L2 is before the return, and at the return bytecode we see before it 
> LINENUMBER 4. If the return was annotated with a linenumber 5 or 6, I 
> assume the debugger would step to the closing brace of the if 
> statement (or of the method itself, depending on what was preferred). 
> Is this an issue with the IntelliJ debugger, or is it really a 
> limitation of the Groovy bytecode generation?

comparing with Java the last return should be annotated with the line with the closing brace
of the method

> A workaround is if I put an empty return statement at the end of main, 
> the debugger works, but strangely in bytecode I see two returns.

that now is kind of a limitation of our bytecode generation

bye Jochen

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