Illegal attempt to subclass a final Java class should fail when the subclass is 
defined
---------------------------------------------------------------------------------------

                 Key: JRUBY-1000
                 URL: http://jira.codehaus.org/browse/JRUBY-1000
             Project: JRuby
          Issue Type: Bug
          Components: Java Integration
    Affects Versions: JRuby 1.0.0RC2
            Reporter: Bill Dortch
            Priority: Minor


I really just wanted to get in #1000...

An illegal attempt to extend a final Java class should fail (with a Ruby 
exception) at the time the class is declared, rather than waiting until the 
class is instantiated:
{noformat}
>> class L < java.lang.Long
>> end
=> nil
>> l = L.new 1
NativeException: java.lang.IllegalArgumentException: cannot extend final class
        from JavaProxyClassFactory.java:762:in 
`org.jruby.javasupport.proxy.JavaProxyClassFactory.validateArgs'
        from JavaProxyClassFactory.java:162:in 
`org.jruby.javasupport.proxy.JavaProxyClassFactory.newProxyClass'
...etc...
{noformat}

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