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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