[GROOVY-10103] Lambda with command method call fails with cast exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0-alpha-3
• Fix Version/s: 4.0.0-beta-2
• Assignee: Unassigned
• Reporter: Eric Milles
• Created: 21/May/21 17:07
• Updated: 03/Feb/22 22:32
• Resolved: 18/Nov/21 17:18

Description

Consider the following:

import java.util.function.*

Supplier<String> s = () -> 'hello'
print s.get()

Consumer<String> c = x -> print x;
c.accept(' ')

Function<Integer, String> f = (Integer i) -> { 'world' }
print f(42)

This script prints "hello world" under Groovy 3 but fails at runtime under Groovy 4 with exception:

org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'interface java.util.function.Consumer' with class 'java.lang.Class' to class 'java.util.function.Consumer'