[jira] [Resolved] (GROOVY-9781) Groovy 3 doesn't call implicit constructor properly for inner classes

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-9781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles resolved GROOVY-9781.
---------------------------------
    Resolution: Information Provided

> Groovy 3 doesn't call implicit constructor properly for inner classes
> ---------------------------------------------------------------------
>
>                 Key: GROOVY-9781
>                 URL: https://issues.apache.org/jira/browse/GROOVY-9781
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 4.0.0-alpha-1, 3.0.6
>            Reporter: Howard
>            Priority: Major
>
> Groovy 2 automatically calls the implicit constructor when the function definition requires returning a different class. Example
> {code}
> class B{
>     class A {
>         List a;
>     }
>     
>     A func2() {
>         return ['a': []]
>     }   
> }
> def b = new B().func2()
> b
> {code}
> Func2 automatically calls an implicit constructor for A using the map. The same code does not run on groovy 3 resulting in the following error msg
> {code}
> org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object '{a=[]}' with class 'java.util.LinkedHashMap' to class 'B$A' due to: groovy.lang.GroovyRuntimeException: Could not find named-arg compatible constructor. Expecting one of:
> B$A(Map)
> B$A()
> 	at B.func2(ConsoleScript8:7)
> 	at B$func2.call(Unknown Source)
> 	at ConsoleScript8.run(ConsoleScript8:10)
> 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> {code}



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