[jira] [Created] (GROOVY-9506) Joint compilation is broken

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

Daniil Ovchinnikov created GROOVY-9506:
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             Summary: Joint compilation is broken
                 Key: GROOVY-9506
                 URL: https://issues.apache.org/jira/browse/GROOVY-9506
             Project: Groovy
          Issue Type: Bug
    Affects Versions: 2.5.10
            Reporter: Daniil Ovchinnikov


{code:title=playground.groovy}
@groovy.transform.AutoImplement
class C implements Runnable {}

class Main {
    static void main(String[] args) {
        def c = new C()
        c.run()
    }
}
{code}

{code:title=I.java}
public interface I {
  void foo();
}
{code}

{noformat}
$ groovyc I.java playground.groovy -j
$ java -cp .:$GROOVY_HOME/lib/groovy-2.5.10.jar Main
Exception in thread "main" java.lang.NullPointerException
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:37)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:119)
	at Main.main(playground.groovy:9)
{noformat}

What happens:
1. {{org.codehaus.groovy.tools.javac.JavaStubGenerator#printClassContents}} applies its {{Verifier}}. 
2. {{org.codehaus.groovy.classgen.Verifier#addGroovyObjectInterfaceAndMethods}} adds {{GroovyObject}} interface and {{GroovyObject}}'s methods}} via {{org.codehaus.groovy.classgen.Verifier#addMethod}}.
3. {{Verifier#addMethod}} is overridden in {{#printClassContents}}' {{Verifier}} to skip adding methods to the class node.
4. at the moment when {{@AutoImplement}} kicks in there exists the {{GroovyObject}} interface and no methods in the class node, so the transformation adds default method implementations.

Related: https://youtrack.jetbrains.com/issue/IDEA-237148



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