[GROOVY-9386] Field initialized in a trait using tap doesn't work correctly

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.5.9, 3.0.0-rc-3
• Fix Version/s: 4.0.0-alpha-1, 3.0.6, 2.5.16
• Labels: traits
• Assignee: Eric Milles
• Reporter: Matthias Kiefer
• Created: 06/Feb/20 16:34
• Updated: 28/Feb/24 16:24
• Resolved: 09/Aug/20 00:47

Description

The following code

class Foo {
    int bar
}

trait TestTrait {
    def foo = new Foo().tap{
        bar = 1
    }
}

class SomeClass implements TestTrait {

}

new SomeClass()

fails with the following error:

Caught: groovy.lang.MissingPropertyException: No such property: bar for class: SomeClass
Possible solutions: foo
groovy.lang.MissingPropertyException: No such property: bar for class: SomeClass
Possible solutions: foo
	at TestTrait$Trait$Helper$__init__closure1.doCall(scratch.groovy:8)
	at TestTrait$Trait$Helper.$init$(scratch.groovy:7)
	at SomeClass.<init>(scratch.groovy)
	at scratch.run(scratch.groovy:16)

if using the following code in the tap makes it work correctly:

trait TestTrait {
    def foo = new Foo().tap{
        it.bar = 1
    }
}

Also when used in a class directly, it works also correctly:

class SomeClass {
    def foo = new Foo().tap{
        bar = 1
    }
}