[GROOVY-4896] Anonymous inner class failure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.10, 1.8.0, 3.x
• Fix Version/s: 2.3.4
• Component/s: class generator
• Assignee: Jochen Theodorou
• Reporter: Marco Trevisan
• Created: 23/Jun/11 10:35
• Updated: 15/Oct/15 18:16
• Resolved: 03/Jul/14 05:18

Description

Hi all,

I found some strange behaviour using anonymous inner classes.

If I declare (and use) an anonymous inner class inside a groovy closure inside a method, AND the anonymous inner class uses at least one of the method's input parameters, I get the following exception:

groovy.lang.GroovyRuntimeException: Could not find matching constructor for: [className]$[closureNumber]([parameters])

    void doSomethingUsingParam(final String s1){ // This always fails
        logExceptions {
            println "doing something (expect exception)..."
            Runnable ifA = new Runnable(){
                        void run(){
                            println s1
                        }
                    }
            ifA.run()
        }
    }

    def logExceptions(Closure c){
        try{
            return c.call()
        } catch (Throwable e){
            e.printStackTrace();
        }
    }
}

I think it's a bug because the same code runs smoothly if, instead of the method input parameter, I use a local variable inside the groovy closure (the local variable doesn't even need to be declared as "final").

void doSomethingUsingParamWorkaround(final String s2){
    logExceptions {
        println "doing something..."
        String s1=s2 // Too Ungroovy IMHO
        Runnable ifA = new Runnable(){
                    void run(){
                        println s1
                    }
                }
        ifA.run()
    }
}

A more complete set of variants of the above methods is attached