[jira] [Commented] (GROOVY-9874) Groovy3 CompileStatic bug: extends/implements confusion

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

    [ https://issues.apache.org/jira/browse/GROOVY-9874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253836#comment-17253836 ] 

Paul King commented on GROOVY-9874:
-----------------------------------

Your example ran fine for me with Groovy 3.0.7. The error message you are getting hints that you have another {{Abc}} class with an inner {{Def}} class also on your classpath?

> Groovy3 CompileStatic bug: extends/implements confusion
> -------------------------------------------------------
>
>                 Key: GROOVY-9874
>                 URL: https://issues.apache.org/jira/browse/GROOVY-9874
>             Project: Groovy
>          Issue Type: Bug
>            Reporter: Howard
>            Priority: Major
>
> The following code compiles on groovy 2 but does not compile on groovy 3
> {code:java}
> import groovy.transform.CompileStatic
> @CompileStatic
> public class Abc implements Def {
>     private double[] myabc;
>     
>     Abc(){
>         myabc = new double[1];
>     }
>     public Def clone() {
>         Abc a = (Abc) super.clone();
>         a.myabc = myabc.clone() as double[]
>         return a
>     }
> }
> public interface Def extends Cloneable {
>     public Def clone() throws CloneNotSupportedException;
> }
> new Abc().clone()
> {code}
> groovy3 error msg
> {code:java}
> [Static type checking] - Cannot return value of type Abc on method returning type Abc$Def
>  at line: 14, column: 16
> {code}
> however when i comment out the CompileStatic annotation, i get
> {code:java}
> You are not allowed to implement the class 'Abc$Def', use extends instead.
>  at line: 4, column: 1
> {code}
> which is odd because Def is an interface. And when I did change it to extends, i get
> {code:java}
> java.lang.NoSuchMethodError: Abc$Def: method 'void <init>()' not found
> 	at Abc.<init>(ConsoleScript141)
> 	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> 	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> 	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> 	at ConsoleScript141.run(ConsoleScript141:23)
> {code}
> which is not expected given that the interface cannot have a constructor.



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