Re: NPE in FrameNode

melix wrote:
> Hi,
> 
> I'm new to ASM, so there must be many things I'm missing. I'm trying to
> replace a method with another. I've written code for the new method, and
> looked at the bytecode outline to see what's generated for it. At the end of
> the method, I can see the following :
> 
>  L9
>     LINENUMBER 227 L9
>    FRAME CHOP 1
>     ICONST_0
>     IRETURN
> 
> This actually gets converted to the following ASM code :
> 
> mv.visitLabel(l9);
> mv.visitLineNumber(227, l9);
> mv.visitFrame(Opcodes.F_CHOP,1, null, 0, null);
> mv.visitInsn(ICONST_0);
> mv.visitInsn(IRETURN);
> 
> However, if I use a MethodNode as the method visitor, then the following
> exception is thrown :
> 
> Exception in thread "main" java.lang.NullPointerException
> 	at java.util.Arrays$ArrayList.<init>(Arrays.java:3357)
> 	at java.util.Arrays.asList(Arrays.java:3343)
> 	at org.objectweb.asm.tree.FrameNode.asList(Unknown Source)
> 	at org.objectweb.asm.tree.FrameNode.<init>(Unknown Source)
> 	at org.objectweb.asm.tree.MethodNode.visitFrame(Unknown Source)
> 
> Is it a bug in ASM (FrameNode ? MethodNode ?), in ASMifier, or in my own
> code ? Is there any workaround ?

It was indeed a bug in FrameNode, I fixed it in SVN.

Eric

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