[jira] [Created] (GROOVY-9799) Using a method reference causes a compiler error

["Christopher Smith (Jira)" <ji...@apache.org>]

Christopher Smith created GROOVY-9799:
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             Summary: Using a method reference causes a compiler error
                 Key: GROOVY-9799
                 URL: https://issues.apache.org/jira/browse/GROOVY-9799
             Project: Groovy
          Issue Type: Bug
          Components: class generator, Static compilation
    Affects Versions: 3.0.6
            Reporter: Christopher Smith


This appears to be distinct from GROOVY-9798 though appearing in similar circumstances.

When using static compilation (only; {{@TypeChecked}} works fine), using a method reference as a parameter expecting a {{Function}} results in a compiler error:

{code}
Error occurred while calling a method on a Groovy class from classpath.: InvocationTargetException: BUG! exception in phase 'class generation' in source unit '/home/christopher/gnomes/src/main/groovy/com/example/gnomes/GnomeController.groovy' ClassNode#getTypeClass for com.example.gnomes.Gnome called before the type class is set
{code}

This error occurs _both_ when using {{static GnomeDto from(Gnome g)}} as {{GnomeDto::from}} (correctly marked as a static reference in Eclipse, in case relevant) and when using {{GnomeDto toDto()}} as {{Gnome::toDto}}. In both cases explicitly adding {{as Function}} to the method reference resolves the problem.



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