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java.nio.channels.ClosedSelectorException: 	at sun.nio.ch.SelectorImpl.keys(SelectorImpl.java:68)	at org.jruby.util.io.SelectorPool.put(SelectorPool.java:88)	at org.jruby.util.io.SelectExecutor.selectEnd(SelectExecutor.java:59)	at org.jruby.util.io.SelectExecutor.go(SelectExecutor.java:44)	at org.jruby.RubyIO.select(RubyIO.java:3381)	at org.jruby.RubyIO$INVOKER$s$0$3$select.call(RubyIO$INVOKER$s$0$3$select.gen)	at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:720)	at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:197)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:338)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:315)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)	at org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:78)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130)	at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:189)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:131)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:340)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)	at org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:78)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130)	at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:189)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:131)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:340)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)	at org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:78)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130)	at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:189)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:131)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:340)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73)	at org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132)	at org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148)	at org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:66)	at org.jruby.runtime.Block.call(Block.java:126)	at org.jruby.RubyProc.call(RubyProc.java:324)	at org.jruby.RubyProc.call(RubyProc.java:249)	at org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:104)	at java.lang.Thread.run(Thread.java:745)