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https://issues.apache.org/jira/browse/GROOVY-12604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Murphy Heiberg updated GROOVY-12604:
------------------------------------------
Description:
{code:groovy}
import groovy.transform.Virtual
trait T {
@Virtual static String setting() { 'default' }
static String describe() { 'setting=' + setting() }
}
class C implements T {}
assert C.describe() == 'setting=default'
assert T.describe() == 'setting=default'
{code}
Actual: {{T.describe()}} throws {{MissingMethodException: No signature of
static method: setting for class: T is applicable for argument types: ()
values: []}}. This happens in dynamic Groovy, with @TypeChecked and with
@CompileStatic. The trait documentation's own @Virtual example fails the same
way when called as {{Configurable.describe()}}.
Expected: called through the trait itself there is no implementing class, so
the trait's own (default) implementation of the @Virtual static is used, and
the call returns {{setting=default}}.
Public trait statics are promoted to the trait interface, and the forwarder
passes the trait interface as the static self. The @Virtual call site
dispatches dynamically on that self, but @Virtual statics are deliberately not
promoted to the interface, so the call finds nothing.
Seen in 6.0.0 (the first version with @Virtual).
PR: https://github.com/apache/groovy/pull/3131
was:
{code:groovy}
import groovy.transform.Virtual
trait T {
@Virtual static String setting() { 'default' }
static String describe() { 'setting=' + setting() }
}
class C implements T {}
assert C.describe() == 'setting=default'
assert T.describe() == 'setting=default'
{code}
Actual: {{T.describe()}} throws {{MissingMethodException: No signature of
static method: setting for class: T is applicable for argument types: ()
values: []}}. This happens in dynamic Groovy, with @TypeChecked and with
@CompileStatic. The trait documentation's own @Virtual example fails the same
way when called as {{Configurable.describe()}}.
Expected: called through the trait itself there is no implementing class, so
the trait's own (default) implementation of the @Virtual static is used, and
the call returns {{setting=default}}.
Public trait statics are promoted to the trait interface, and the forwarder
passes the trait interface as the static self. The @Virtual call site
dispatches dynamically on that self, but @Virtual statics are deliberately not
promoted to the interface, so the call finds nothing.
Seen in 6.0.0 (the first version with @Virtual).
> A promoted trait static that calls a @Virtual static fails with
> MissingMethodException when called through the trait
> --------------------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-12604
> URL: https://issues.apache.org/jira/browse/GROOVY-12604
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 6.0.0
> Reporter: Scott Murphy Heiberg
> Priority: Major
>
> {code:groovy}
> import groovy.transform.Virtual
> trait T {
> @Virtual static String setting() { 'default' }
> static String describe() { 'setting=' + setting() }
> }
> class C implements T {}
> assert C.describe() == 'setting=default'
> assert T.describe() == 'setting=default'
> {code}
> Actual: {{T.describe()}} throws {{MissingMethodException: No signature of
> static method: setting for class: T is applicable for argument types: ()
> values: []}}. This happens in dynamic Groovy, with @TypeChecked and with
> @CompileStatic. The trait documentation's own @Virtual example fails the same
> way when called as {{Configurable.describe()}}.
> Expected: called through the trait itself there is no implementing class, so
> the trait's own (default) implementation of the @Virtual static is used, and
> the call returns {{setting=default}}.
> Public trait statics are promoted to the trait interface, and the forwarder
> passes the trait interface as the static self. The @Virtual call site
> dispatches dynamically on that self, but @Virtual statics are deliberately
> not promoted to the interface, so the call finds nothing.
> Seen in 6.0.0 (the first version with @Virtual).
> PR: https://github.com/apache/groovy/pull/3131
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