[jboss-jira] [JBoss JIRA] (JASSIST-127) interface proxy creation fails if there are methods with covariant return types
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https://issues.jboss.org/browse/JASSIST-127?page=com.atlassian.jira.plugi...
]
Brice Dutheil commented on JASSIST-127:
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The proposed solution doesn't work, the JVM raises an AbstractMethodError on the call
site.
What happen is that the proposed solution discard method with same name / same argument as
the return type is not taken into account when generating the key in getMethods.
Reverting the actual patch raises DuplicateMemberException because ClassFile.isDuplicated
don't see either of these method as bridge.
I've created a patch that detect methods with covariant type and mark forwarding
methods as bridge in relevant scenarios.
Also, I'm not sure of that one but the path also adds a boolean to enable the
MethodHandler to intercept bridge methods.
interface proxy creation fails if there are methods with covariant
return types
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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.
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