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https://issues.apache.org/jira/browse/GROOVY-9799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-9799.
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> 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
> Assignee: Eric Milles
> Priority: Minor
> Fix For: 3.0.7, 4.0.0-alpha-2
>
> Attachments: Groovy9799.groovy
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> 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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