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From "Eric Milles (JIRA)" <>
Subject [jira] [Created] (GROOVY-8815) Inconsistent class file - undefined type parameter for trait
Date Thu, 27 Sep 2018 17:21:00 GMT
Eric Milles created GROOVY-8815:

             Summary: Inconsistent class file - undefined type parameter for trait
                 Key: GROOVY-8815
             Project: Groovy
          Issue Type: Bug
    Affects Versions: 2.5.2, 2.4.15
            Reporter: Eric Milles

When compiling the following classes, the Service class ends up with an incomplete type parameter
in it.  This causes errors for the IDE: "Inconsistent classfile encountered: The undefined
type parameter T is referenced from within Service"

import java.util.function.Consumer
import groovy.transform.CompileStatic

class Event<T> {
  Event(String id, T payload) {
  Event<T> setReplyTo(Object replyTo) {

trait Events {
  def <E extends Event<?>> Registration<Object, Consumer<E>> on(Class
key, Closure consumer) {

interface Registration<K, V> {

javap output for Events shows:
  public abstract <E extends reactor.bus.Event<?>> reactor.bus.registry.Registration<java.lang.Object,
reactor.fn.Consumer<E>> on(java.lang.Class, groovy.lang.Closure);

javap output for Service shows:
  public <E extends Event<T>> Registration<java.lang.Object, java.util.function.Consumer<E>>
on(java.lang.Class, groovy.lang.Closure);
  public <E extends Event<?>> Registration<java.lang.Object, java.util.function.Consumer<E>>
Eventstrait$super$on(java.lang.Class, groovy.lang.Closure);

It is this "T" in the trait method that is not defined.  I think it should be "?" instead
when looking at the original method's and the trait bridge method's type parameters.

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