[GROOVY-8891] Trait Instance Init Block causes Runtime exception for Trait fields with default values

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 2.5.5
• Component/s: Compiler, groovy-runtime
• Assignee: Unassigned
• Reporter: Anton Pryamostanov
• Created: 18/Nov/18 18:13
• Updated: 19/Nov/18 08:36
• Resolved: 19/Nov/18 08:36

Description

With ref. to GROOVY-8880, when instance or static field has default value in Trait, when same Trait has Instance Init Block, Runtime exception happens.

Example code:

trait Trait {
    Integer fieldWithDefaultValue = 0
    {
        System.out.println("Only instance init block gives this problem")
    }
}
class ClassWithTrait implements Trait {
}
new ClassWithTrait().fieldWithDefaultValue

Runtime exception:

groovy.lang.MissingMethodException: No signature of method: java.lang.Integer.call() is applicable for argument types: (Trait$Trait$Helper$__init__closure1) values: [Trait$Trait$Helper$__init__closure1@5833d058]
Possible solutions: wait(), abs(), any(), wait(long), each(groovy.lang.Closure), any(groovy.lang.Closure)

	at Trait$Trait$Helper.$init$(ConsoleScript80:3)

	at ClassWithTrait.<init>(ConsoleScript80)

	at ConsoleScript80.run(ConsoleScript80:9)

Note: It does not matter if field is static of instance.
Note 2: Static Init Block in Trait does not cause same issue and works Ok.

Issue Links

• is related to: GROOVY-8892 Trait instance init blocks are called only when there are fields defined in same Trait
• relates to: GROOVY-8880 Traits - static/instance init blocks