[GROOVY-8123] Wrong invokation target of static method

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.4.9
• Fix Version/s: 2.4.11
• Component/s: groovy-runtime
• Assignee: Paul King
• Reporter: Jędrzej Dąbrowa
• Created: 15/Mar/17 12:41
• Updated: 02/May/17 02:03
• Resolved: 24/Apr/17 14:38

Description

Given following set of java classes:

Interface.java

public interface Interface {
    class ExternalInterface implements Interface {}

    static Interface provide() {
        new Throwable().printStackTrace();
        return new ExternalInterface();
    }
}

MyInterface.java

public abstract class MyInterface implements Interface {

    private static class MyInterfaceImpl extends MyInterface {}

    public static MyInterface provide() {
        return new MyInterfaceImpl();
    }
}

And below Groovy code:

Test.groovy

class Test {
    static void main(String[] args) {
        MyInterface myInterface = MyInterface.provide()
    }
}

It yields following result:

Exception in thread "main" org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'Interface$ExternalInterface@24a35978' with class 'Interface$ExternalInterface' to class 'MyInterface'
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:405)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:319)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:232)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:603)
	at Test.main(Test.groovy:9)

Stacktrace during creating object of invalid type is:

at Interface.provide(Interface.java:7)
	at Interface$provide.call(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
	at Test.main(Test.groovy:9)

To me this seems to be a bug. Or is this expected behavior?