Using a shared listener socket causes java.nio.channels.IllegalBlockingModeException exceptions to be raised

I recently wrote an example that uses multiple acceptor threads that all listen on the same listener socket. This works fine on MRI 1.9.3, however repeatedly fails in JRuby. The sample app can be found here: https://github.com/ryanlecompte/timeserver

One server is running, simply telnet localhost 3000 and you will see the error.

Server launched: 10 acceptors, 10 workers.

Exception in thread "RubyThread-34: /Users/ryan/fun/timeserver/lib/timeserver/server.rb:37" java.nio.channels.IllegalBlockingModeException
at java.nio.channels.spi.AbstractSelectableChannel.configureBlocking(AbstractSelectableChannel.java:257)
at org.jruby.util.io.SelectBlob.tidyUp(SelectBlob.java:352)
at org.jruby.util.io.SelectBlob.goForIt(SelectBlob.java:94)
at org.jruby.RubyIO.select_static(RubyIO.java:3398)
at org.jruby.RubyIO.select(RubyIO.java:3394)
at org.jruby.RubyIO$INVOKER$s$0$3$select.call(RubyIO$INVOKER$s$0$3$select.gen:65535)
at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:69)
at org.jruby.ast.CallManyArgsNode.interpret(CallManyArgsNode.java:59)
at org.jruby.ast.IfNode.interpret(IfNode.java:111)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.ast.WhileNode.interpret(WhileNode.java:131)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.evaluator.ASTInterpreter.INTERPRET_BLOCK(ASTInterpreter.java:112)
at org.jruby.runtime.Interpreted19Block.evalBlockBody(Interpreted19Block.java:209)
at org.jruby.runtime.Interpreted19Block.yield(Interpreted19Block.java:197)
at org.jruby.runtime.Interpreted19Block.call(Interpreted19Block.java:128)
at org.jruby.runtime.Block.call(Block.java:89)
at org.jruby.RubyProc.call(RubyProc.java:269)
at org.jruby.RubyProc.call(RubyProc.java:223)
at org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:101)
at java.lang.Thread.run(Thread.java:680)