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

[mgroovy (Jira)]

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

Howard updated GROOVY-9781:
---------------------------
    Description:
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}

  was:
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}

Fun2 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}

> 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
>            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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