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https://issues.apache.org/jira/browse/GROOVY-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16015339#comment-16015339
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Paul King edited comment on GROOVY-8188 at 5/18/17 7:35 AM:
------------------------------------------------------------
Ah, okay, I didn't see it before. It's a bridge method added for a covariant
return type. The ClassCompletionVerifier doesn't seem to look at return type
which seems wrong to me. Here is a smaller example which exhibits the problem:
{code}
interface Foo {
Foo foo()
}
abstract class FooImpl implements Foo {
final FooImpl foo() { null }
}
class Main extends FooImpl implements Foo { }
assert !new Main().foo()
{code}
Note that the {{implements Foo}} is redundant but required to produce the error.
was (Author: paulk):
Ah, okay, I didn't see it before. It's a bridge method added for a covariant
return type. The ClassCompletionVerifier doesn't seem to look at return type
which seems wrong to me.
> Unpredictable behavior - Compiler error: groovyc: You are not allowed to
> override the final method
> --------------------------------------------------------------------------------------------------
>
> Key: GROOVY-8188
> URL: https://issues.apache.org/jira/browse/GROOVY-8188
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 2.4.11
> Environment: Windows
> Reporter: Abbas Gadhia
> Attachments: groovyc.7z
>
>
> I'm trying to extend from an abstract class and override one of its abstract
> methods. Another "final" concrete method of the same name exists in the
> abstract class.
> When I compile, it complains that i cannot override the method marked as
> final, however i've only overriden the abstract method, and not the "final"
> one.
> This issue is sporadic. The error pops up and goes after several retries
> I've attached a simple project that reproduces this issue. The error may or
> may not happen the first time. Tweaking the code here and there, gets the
> issue to pop up
> Here's a sample of the error message
> bq. Error:Groovyc: You are not allowed to override the final method
> copy(org.apache.calcite.plan.RelTraitSet ->
> org.apache.calcite.plan.RelTraitSet,java.util.List -> java.util.List <E
> extends java.lang.Object>) from class 'org.apache.calcite.rel.core.Join'.
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