[jboss-jira] [JBoss JIRA] Resolved: (JASSIST-127) interface proxy creation fails if there are methods with covariant return types

interface proxy creation fails if there are methods with covariant return types ------------------------------------------------------------------------------- Key: JASSIST-127 URL: https://issues.jboss.org/browse/JASSIST-127 Project: Javassist Issue Type: Bug Affects Versions: 3.12.0.GA Environment: Java 1.6. Reporter: Paul Pogonyshev Assignee: Shigeru Chiba Labels: patch Fix For: 3.16.0-GA Attachments: jassist-127-fix.diff Creation of proxy class for interface Bar fails: public interface Foo { Foo getSelf (); } public interface Bar extends Foo { Bar getSelf (); } This is because of covariant return types of method getSelf(). However, as this is permitted by the language (i.e. subtype can restrict the return type further), I consider this a bug.