[GROOVY-10995] Classes are compiled in Groovy 3 and Java but fails in Groovy 4

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.10
• Component/s: Compiler
• Assignee: Unassigned
• Reporter: Marat Kamalov
• Created: 29/Mar/23 13:08
• Updated: 29/Mar/23 14:14
• Resolved: 29/Mar/23 14:14

Description

We use Groovy 3. And I tried to migrate the existing application to use Groovy 4. 

I have a compilation issue in the code and the same behavior in IntelliJ IDEA, because it uses Groovy 4 syntax by default.

What I have:

// A simple interface with generic parameter
// This is Java class compiled by Java
interface MyInterface<T> {
} 

// A simple annotation that expects an MyInterface implemenations
// This is Java class compiled by Java
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@interface MyAnnotation {
    Class<? extends MyInterface<?>> value()
} 

//A class that implements MyInterface and ignores type raw type using warnings
//This is Groovy class located at the same package with the next code
public class MyClass implements MyInterface { 
}

// A method that uses MyAnnotation with MyClass parameter
//This is Groovy code that fails and located at the same package with MyClass
@MyAnnotation(value = com.example.MyClass)
static void main(String[] args) { 
}

This code compiles in Groovy 3 and compiles in Java but fails to compile in Groovy 4.0.10

The code starts to compile in Groovy 4 If I change MyClass implementation to:

public class MyClass implements MyInterface<Object> {
} 

I think it is a bug, please, validate and fix it.