AssertionError at handling of inner inherited Java interface
------------------------------------------------------------
Key: JRUBY-4794
URL: http://jira.codehaus.org/browse/JRUBY-4794
Project: JRuby
Issue Type: Bug
Components: Java Integration
Affects Versions: JRuby 1.5
Reporter: Tobias Vogele
When a Java method returns an object to Ruby, which is an instance of a class,
which implements an inner interface of another class, an AssertionError is
thrown (when running with assertion enabled, ie. using the Java command line
parameter "-ea").
It seems, that the problem is: First proxy for the class is initialized. Then
its interfaces are initialized, so the inner interface is initialized. That all
its surrounding types are initialized, so the outer interface is initialized.
Then the the inner types of that outer type are initialized, so the inner
interface is initialized again. Then the assertion "assert this.proxyModule ==
null;" fails.
Code to reproduce:
{code:title=JRuby script}
Java::Blubber::A.doIt
{code}
{code:title=Java Code}
package blubber;
public class A {
public static Object doIt() {
return new C();
}
}
interface B {
interface BInner {
}
}
class C implements B.BInner {
}
{code}
The stacktrace is:
{code}
org/jruby/javasupport/JavaClass.java:889:in `setupInterfaceModule':
java.lang.AssertionError: null (NativeException)
from org/jruby/javasupport/Java.java:377:in `getInterfaceModule'
from org/jruby/javasupport/Java.java:453:in `getProxyClass'
from org/jruby/javasupport/Java.java:354:in `getInstance'
from org/jruby/javasupport/JavaUtil.java:143:in
`convertJavaToUsableRubyObject'
from org/jruby/javasupport/JavaMethod.java:586:in `convertReturn'
from org/jruby/javasupport/JavaMethod.java:502:in
`invokeDirectWithExceptionHandling'
from docs/playground/run_as_ruby_app.rb:2
{code}
A real life usecase (which is a little bit more complicated..), are the swing
text classes. Here the problem occurs in particular with the classes
javax.swing.text.LayeredHighlighter.LayerPainter and
javax.swing.text.Highlighter.HighlightPainter.
Therefore another way to reproduce the problem is to call
"Java::JavaxSwing::JTextArea.new().getUI()" in JRuby.
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