java -Djava.ext.dirs=/Users/sundar/src/nashorn-jdk8/nashorn/dist -jar box2d.jar nashorn
Iteration 1:
Result: null
Time: 13747ms

Iteration 2:
Result: null
Time: 9763ms

Iteration 3:
Exception in thread "main" javax.script.ScriptException: TypeError: Cannot read property "_key" from undefined in <eval> at line number 408
	at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:472)
	at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:456)
	at jdk.nashorn.api.scripting.NashornScriptEngine.access$100(NashornScriptEngine.java:73)
	at jdk.nashorn.api.scripting.NashornScriptEngine$3.eval(NashornScriptEngine.java:487)
	at javax.script.CompiledScript.eval(CompiledScript.java:106)
	at org.openjdk.nashorn.test.Main.run(Main.java:23)
	at org.openjdk.nashorn.test.Main.main(Main.java:13)
Caused by: <eval>:408 TypeError: Cannot read property "_key" from undefined
	at jdk.nashorn.internal.runtime.ECMAErrors.throwError(ECMAErrors.java:56)
	at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:152)
	at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:139)
	at jdk.nashorn.internal.runtime.Undefined.lookupTypeError(Undefined.java:132)
	at jdk.nashorn.internal.runtime.Undefined.lookup(Undefined.java:115)
	at jdk.nashorn.internal.runtime.linker.NashornLinker.getGuardedInvocation(NashornLinker.java:78)
	at org.dynalang.dynalink.support.CompositeTypeBasedGuardingDynamicLinker.getGuardedInvocation(CompositeTypeBasedGuardingDynamicLinker.java:110)
	at org.dynalang.dynalink.support.CompositeGuardingDynamicLinker.getGuardedInvocation(CompositeGuardingDynamicLinker.java:58)
	at org.dynalang.dynalink.support.LinkerServicesImpl.getGuardedInvocation(LinkerServicesImpl.java:72)
	at org.dynalang.dynalink.DynamicLinker.relink(DynamicLinker.java:163)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$6._L340$_L408$2(<eval>:408)
	at jdk.nashorn.internal.runtime.ScriptObject.userAccessorSetter(ScriptObject.java:3301)
	at jdk.nashorn.internal.runtime.ScriptObject.setObject(ScriptObject.java:2643)
	at jdk.nashorn.internal.runtime.ScriptObject.set(ScriptObject.java:2737)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$3._L340$_L350(<eval>:352)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$3._L340$_L352$1(<eval>:353)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$14._L557$_L591$4(<eval>:591)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$13._L557$_L564(<eval>:565)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$10._L471$_L506(<eval>:507)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$11._L471$_L536$6(<eval>:537)
	at jdk.nashorn.internal.scripts.Script$\^eval\_$15.runBox2D(<eval>:840)
	at jdk.nashorn.internal.scripts.Script$\^eval\_.runScript(<eval>:855)
	at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:359)
	at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:310)
	at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:452)
	... 5 more