Triggered by Gerrit: ...
Building remotely on osx-build_headless
FATAL: null
java.util.ConcurrentModificationException
	at java.util.WeakHashMap$HashIterator.nextEntry(WeakHashMap.java:784)
	at java.util.WeakHashMap$EntryIterator.next(WeakHashMap.java:823)
	at java.util.WeakHashMap$EntryIterator.next(WeakHashMap.java:821)
	at org.jruby.java.proxies.MapJavaProxy$RubyHashMap.internalGet(MapJavaProxy.java:127)
	at org.jruby.RubyHash.op_aref(RubyHash.java:995)
	at org.jruby.java.proxies.MapJavaProxy.op_aref(MapJavaProxy.java:393)
	at org.jruby.java.proxies.MapJavaProxy$i$1$0$op_aref.call(MapJavaProxy$i$1$0$op_aref.gen:65535)
	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:137)
	at org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
	at org.jruby.ast.LocalAsgnNode.interpret(LocalAsgnNode.java:123)
	at org.jruby.ast.IfNode.interpret(IfNode.java:111)
	at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:103)
	at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
	at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:233)
	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:171)
	at org.jruby.ast.FCallTwoArgNode.interpret(FCallTwoArgNode.java:38)
	at org.jruby.ast.LocalAsgnNode.interpret(LocalAsgnNode.java:123)
	at org.jruby.ast.IfNode.interpret(IfNode.java:111)
	at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:103)
	at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
	at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
	at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:190)
	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:137)
	at org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
	at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:103)
	at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
	at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:190)
	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:137)
	at org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
	at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:103)
	at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
	at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:190)
	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:137)
	at org.jruby.ast.FCallOneArgNode.interpret(FCallOneArgNode.java:36)
	at org.jruby.ast.CallThreeArgNode.interpret(CallThreeArgNode.java:61)
	at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:103)
	at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
	at org.jruby.ast.RescueNode.executeBody(RescueNode.java:216)
	at org.jruby.ast.RescueNode.interpretWithJavaExceptions(RescueNode.java:120)
	at org.jruby.ast.RescueNode.interpret(RescueNode.java:110)
	at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:74)
	at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:120)
	at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:134)
	at org.jruby.javasupport.proxy.JavaProxyConstructor$2.invoke(JavaProxyConstructor.java:225)
	at org.jruby.proxy.hudson.tasks.BuildWrapper$Proxy1.setUp(Unknown Source)
	at hudson.model.Build$RunnerImpl.doRun(Build.java:133)
	at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:461)
	at hudson.model.Run.run(Run.java:1404)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:230)