[GROOVY-2320] the abstract method test seems not to know covariant returns types yet

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1-rc-2
• Fix Version/s: 1.1-rc-3
• Component/s: class generator
• Environment: JDK6u3, WinXP
• Assignee: Jochen Theodorou
• Reporter: Daniel Sun
• Created: 17/Nov/07 19:57
• Updated: 18/Nov/07 13:46
• Resolved: 18/Nov/07 13:46

Description

from mailing list:

Hi all,

Executing the following code, Groovy will complain:
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, Script2: 3: Can't have an abstract method in a non-abstract class. The class 'CallableTask' must be declared abstract or the method 'java.lang.Object call()' must be implemented.
@ line 3, column 1.
1 error

<groovy>
import java.util.concurrent.*

class CallableTask implements Callable<String> {
public String call()

{ return new Date().toString() }

}
</groovy>

but in Java, the code can be compiled with no problem.

Could you some one tell me why?

Thanks in advance,
Daniel.Sun