[jira] [Created] (GROOVY-9259) Implementing Groovy interface with default methods can cause compile issues.

["covers1624 (Jira)" <ji...@apache.org>]

covers1624 created GROOVY-9259:
----------------------------------

             Summary: 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


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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