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From Andrew Bayer <>
Subject Re: How does Groovy decide to coerce a GString to a String at method dispatch?
Date Tue, 22 Aug 2017 20:44:41 GMT
I'll answer in more detail later, but it's a LinkedHashMap.get that's being


On Tue, Aug 22, 2017 at 4:34 PM, Jochen Theodorou <> wrote:

> On 22.08.2017 00:53, Andrew Bayer wrote:
>> Hey all -
>> I'm working on an issue in Jenkins' Groovy sandboxing logic -
>> The problem is that
>> 'map."some${variable}"' seems to be acting as if the GStringImpl was the
>> key, rather than the String it should coerce to. I've got a feeling this is
>> due to a flaw in our sandbox's method dispatch code somewhere, so I'm
>> trying to figure out how Groovy is deciding to coerce normally. And I can't
>> tell where that would be. =) Anyone got any pointers?
> it is legal to call get(String) with a String, but the transformation
> happens during the method call by the runtime. Method dispatch in the meta
> class is deciding about what method is to be taken. It is different for
> static compilation of course.
> Now if you have a list of all the get-methods that are available I can
> easily tell you which method will be called and why. So for example if you
> have get(String), get(Object) and get(CharSequence) a call to that method
> with a GString will call the CharSequence method, because that is an
> interface GString is implementing. If that methods would be not there it
> would have been get(String), because String is seen as more near to GString
> than Object for the runtime. Obviously this is not following strictly the
> class hierarchy
> bye Jochen

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