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https://issues.apache.org/jira/browse/GROOVY-9259?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-9259.
---------------------------------
Fix Version/s: 5.0.0-alpha-1
Resolution: Fixed
https://github.com/apache/groovy/commit/df346d56deaec8b3d50d63eb71d2afc98454a463
> Implementing Groovy interface with default methods can cause compile issues.
> ----------------------------------------------------------------------------
>
> Key: GROOVY-9259
> URL: https://issues.apache.org/jira/browse/GROOVY-9259
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 3.0.0-beta-3
> Reporter: covers1624
> Assignee: Eric Milles
> Priority: Minor
> Fix For: 5.0.0-alpha-1
>
>
> Hello!
> Consider the following classes.
> {code:java|title=test/JavaInterface.java|borderStyle=solid}
> package test;
> public interface JavaInterface {
> String doStuff();
> }
> {code}
> {code:java|title=test/GroovyInterface.groovy|borderStyle=solid}
> package test
> interface GroovyInterface extends JavaInterface {
> default doOtherStuff() {
> return 'doot'
> }
> }
> {code}
> {code:java|title=test/GroovyClass.groovy|borderStyle=solid}
> package test
> class GroovyClass implements GroovyInterface {
> @Override
> String doStuff() {
> return "otherDoot"
> }
> }
> {code}
> This code compiles with an error:
> {noformat}
> test/GroovyClass.groovy: 4: Method 'doStuff' from class 'test.GroovyClass'
> does not override method from its superclass or interfaces but is annotated
> with @Override.
> @ line 4, column 5.
> @Override
> ^
> {noformat}
> However, removing the default method inside ~GroovyInterface~, OR, declaring
> ~GroovyClass~ to implement both ~GroovyInterface~ AND ~JavaInterface~ will
> make compilation succeed again.
> Apologies if this is some form of intended behavior, although I suspect it
> isn't due to the nature of this issue.
> Thank You for your time looking into this issue! also thanks for a
> fantastically flexible language!
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