[GROOVY-9799] Using a method reference causes a compiler error

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.6
• Fix Version/s: 3.0.7, 4.0.0-alpha-2
• Component/s: class generator, Static compilation
• Assignee: Eric Milles
• Reporter: Christopher Smith
• Created: 29/Oct/20 22:32
• Updated: 07/Dec/20 22:09
• Resolved: 11/Nov/20 05:39

Description

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:

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

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.