[jira] [Commented] (GROOVY-6996) Anonymous class field initialized with an enclosing argument results in MissingPropertyException

[Andres Almiray (JIRA)]

    [ 
https://issues.apache.org/jira/browse/GROOVY-6996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15855974#comment-15855974
 ] 

Andres Almiray commented on GROOVY-6996:
----------------------------------------

It appears the problem is related to scoping of method arguments. The following 
script works as expected

{code}
class Outer {
    interface Inner {
    }
    
    static with_default_args(args = 'default args') {
        def my_args = args
        def inner =  new Inner() {
            def arguments = my_args
        }
        println inner.arguments
    }

    static main(args) {
        with_default_args()
        with_default_args('jfokus')
    }
}
{code}

prints the following

{code}
default args
jfokus
{code}

Notice the usage of a local variable to grab a reference to the method args. If 
the variable is removed and the method arguments are accessed directly then we 
get an MPE

{code}
groovy> class Outer { 
groovy>     interface Inner { 
groovy>     } 
groovy>      
groovy>     static with_default_args(args = 'default args') { 
groovy>         def inner =  new Inner() { 
groovy>             def arguments = args 
groovy>         } 
groovy>         println inner.arguments 
groovy>     } 
groovy>     static main(args) { 
groovy>         with_default_args() 
groovy>         with_default_args('jfokus') 
groovy>     } 
groovy> } 
 
Exception thrown

groovy.lang.MissingPropertyException: No such property: args for class: Outer
        at Outer$1.propertyMissing(ConsoleScript26)
        at Outer$1.<init>(ConsoleScript26)
        at Outer.with_default_args(ConsoleScript26:6)
        at Outer.with_default_args(ConsoleScript26)
        at Outer.main(ConsoleScript26:13)
{code}

Tested with Groovy 2.4.8

> Anonymous class field initialized with an enclosing argument results in 
> MissingPropertyException
> ------------------------------------------------------------------------------------------------
>
>                 Key: GROOVY-6996
>                 URL: https://issues.apache.org/jira/browse/GROOVY-6996
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.4.1
>         Environment: Oracle JDK 1.7.0_60 @ Mavericks
>            Reporter: Bastian Helfert
>            Priority: Minor
>         Attachments: MissingPropertyExceptionBug.groovy
>
>
> Since Groovy 2.3.3 initializing a field of an anonymous class with an 
> enclosing argument results in a MissingPropertyException:
> Code:
> {code}
> class MissingPropertyExceptionBug {
>     interface SomeType {
>     }
>     static main(args) {
>         new SomeType() {
>             def arguments = args
>         }
>     }
> }
> {code}
> ...results in:
> {code}
> Exception in thread "main" groovy.lang.MissingPropertyException: No such 
> property: args for class: MissingPropertyExceptionBug
>       at 
> groovy.lang.MetaClassImpl.invokeStaticMissingProperty(MetaClassImpl.java:996)
>       at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:1851)
>       at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:1827)
>       at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:3690)
>       at 
> org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:171)
>       at 
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.getProperty(ScriptBytecodeAdapter.java:452)
>       at 
> MissingPropertyExceptionBug$1.propertyMissing(MissingPropertyExceptionBug.groovy)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
>       at 
> groovy.lang.MetaClassImpl.invokeMissingProperty(MetaClassImpl.java:874)
>       at groovy.lang.MetaClassImpl$12.getProperty(MetaClassImpl.java:2018)
>       at 
> org.codehaus.groovy.runtime.callsite.GetEffectivePogoPropertySite.getProperty(GetEffectivePogoPropertySite.java:82)
>       at 
> org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:231)
>       at 
> MissingPropertyExceptionBug$1.<init>(MissingPropertyExceptionBug.groovy)
>       at 
> MissingPropertyExceptionBug.main(MissingPropertyExceptionBug.groovy:7)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
> {code}
> Workaround:
> Use a top-level class instead.



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