Subclasses of interface-only Java proxy classes don't inherit correctly
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Key: JRUBY-921
URL: http://jira.codehaus.org/browse/JRUBY-921
Project: JRuby
Issue Type: Bug
Components: Java Integration
Affects Versions: JRuby 1.0.0
Reporter: Bill Dortch
Subclasses of interface-only Java proxy classes don't inherit correctly. Note
that this issue differs from JRUBY-910, which applies to subclasses of
concrete Java classes.
The following will not work:
{code}
class InterfacesOnly # not descended/derived from the Java class hierarchy
include java.lang.Runnable
def run
end
end
SomeClass.new.addRunnable InterfacesOnly.new #=> works
class IO2 < InterfacesOnly
include java.lang.Comparable
def compareTo(other)
...
end
end
SomeClass.new.addRunnable IO2.new #=> fails
{code}
As I noted in JRUBY-910, interface-only classes reside in a nether-world; they
are not descended from the Rubified Java hierarchy (there is no implicit
java.lang.Object superclass, and really not a clean way to make this so once
the user has declared the class). They'll never really quite fit;
kind_of?java.lang.Object will always respond false.
Nonetheless, it should be possible to make the above example work. However,
until then there is a simple workaround (contingent on the application of the
patch for JRUBY-910):
{code}
class InterfacesOnly < java.lang.Object
include java.lang.Runnable
def run
...
end
end
SomeClass.new.addRunnable InterfacesOnly.new #=> works
class IO2 < InterfacesOnly
include java.lang.Comparable
def compareTo(other)
...
end
end
SomeClass.new.addRunnable IO2.new #=> works
SomeClass.new.addComparable IO2.new #=> works
{code}
Because the workaround is so simple, I'd consider this low-priority for the
moment.
-Bill
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