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https://issues.apache.org/jira/browse/GROOVY-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17755685#comment-17755685
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jonny commented on GROOVY-4647:
-------------------------------
For what it's worth, I've observed a problem like this in Groovy 4.0.8, so this
remains a live bug in a post-parrot world.
> A class using the @Delegate annotation does not implement the delegate's
> interfaces from the Java side when join compiling
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-4647
> URL: https://issues.apache.org/jira/browse/GROOVY-4647
> Project: Groovy
> Issue Type: Bug
> Components: Compiler, Stub generator / Joint compiler
> Affects Versions: 1.7.6, 1.8-beta-3, 2.4.0-rc-1
> Reporter: Travis Schneeberger
> Priority: Major
>
> A class using the @Delegate annotation does not implement the delegate's
> interfaces from the Java side when joint compiling. The workaround for this
> is using a cast. This is confusing when working on mixed java/groovy
> projects. When inspecting the generated class file, the class doing the
> delegation does indeed implement the correct interfaces so I'm guessing it
> has something to do with the stub generation.
> See the following example:
> {code}
> //groovy code
> class DelegateWeirdness {
> @Delegate
> private Collection l = new ArrayList();
> }
> {code}
> {code}
> //java code
> public class DelegateWierdnessClient {
> Collection c = new DelegateWeirdness();
> }
> {code}
> {code}
> C:\IdeaProjects\groovy-bugs>groovyc -j
> src\main\groovy\DelegateWeirdness.groovy src\main\java\DelegateWierdnes
> sClient.java
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> Compile error during compilation with javac.
> C:\IdeaProjects\groovy-bugs\src\main\java\DelegateWierdnessClient.java:4:
> incompatible types
> found : DelegateWeirdness
> required: java.util.Collection
> Collection c = new DelegateWeirdness();
> ^
> 1 error
> 1 error
> {code}
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