[groovy-user] Closure.toString() calls the closure?

[Jan Rudert]

Hi,

I am using groovy 1.6.3 and have a closure mocking an interface:

Closure failing = {
throw new RuntimeException("for test")
}

MyType instance = failing as MyType

afterwards I call the toString()-method on the object. I see the closure
being executed:

instance.toString()

Here is an snippet from the Exception:

at groovy.lang.Closure.call(Closure.java:279)
at
org.codehaus.groovy.runtime.ConvertedClosure.invokeCustom(ConvertedClosure.java:48)
at
org.codehaus.groovy.runtime.ConversionHandler.invoke(ConversionHandler.java:77)
at $Proxy6.toString(Unknown Source)

is that right?

Thank you
Jan

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[Roshan Dawrani]

It does look a little weird and it is not really toString() related.

So, in the code, all 3 calls shown result in closure invocation. Not sure what purpose this behavior solves.

==================================

Closure failing = {
      throw new RuntimeException("for test")
}

interface MyType {
    def abc()
    def xyz()

}

MyType instance = failing as MyType

// ****** all 3 calls below result in the closure to be invoked *****
instance.abc()
instance.xyz()
instance.toString()
==================================

[Roshan Dawrani]

Can you please open a JIRA for this?

Looks like the fix of GROOVY-2801 has affected the case you have reported.

It was supposed to affect only the case where a map of closures was mapped to an interface. The GROOVY-2801 fix should have avoided the mapping of a single closure to an interface scenario.

[Jan Rudert]

http://jira.codehaus.org/browse/GROOVY-3574

I workaround using a map of closures now.

Thanks for your help!
Jan

Roshan Dawrani schrieb: