Scott Murphy Heiberg created GROOVY-12597:
---------------------------------------------
Summary: Calling a stateful trait static method through the trait
fails with MissingMethodException for the internal field accessor
Key: GROOVY-12597
URL: https://issues.apache.org/jira/browse/GROOVY-12597
Project: Groovy
Issue Type: Bug
Affects Versions: 6.0.0
Reporter: Scott Murphy Heiberg
{code:groovy}
trait T {
private static boolean flag = true
static boolean isReady() { flag }
}
class C implements T {}
assert C.isReady()
assert T.isReady()
{code}
Actual: {{T.isReady()}} (and {{T.ready}}) throws
{{groovy.lang.MissingMethodException: No signature of static method:
T__flag$get for class: T is applicable for argument types: () values: []}}. The
same happens in dynamic Groovy, with @TypeChecked and with @CompileStatic, and
for static properties, setters, closures and private static helpers.
Expected: trait static state belongs to each implementing class, so the trait
itself has none. The call should fail with an error that says so, not with a
missing internal accessor. Stateless static methods called through the trait
keep working.
Cause: the promoted interface static forwarder passes the trait class as the
static self of the helper method. A static field access in the helper becomes a
call to the generated accessor (here T__flag$get) on that class, and only
implementing classes declare one.
Seen in 6.0.0. 5.x does not promote trait statics onto the interface.
--
This message was sent by Atlassian Jira
(v10.3.26#10030026)
