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java.lang.NullPointerException: 	at java.nio.channels.spi.AbstractSelectableChannel.removeKey(AbstractSelectableChannel.java:128)	at java.nio.channels.spi.AbstractSelector.deregister(AbstractSelector.java:185)	at sun.nio.ch.EPollSelectorImpl.implClose(EPollSelectorImpl.java:147)	at sun.nio.ch.SelectorImpl.implCloseSelector(SelectorImpl.java:114)	at java.nio.channels.spi.AbstractSelector.close(AbstractSelector.java:108)	at org.apache.activemq.transport.tcp.TcpTransportServer.doStop(TcpTransportServer.java:476)	at org.apache.activemq.util.ServiceSupport.stop(ServiceSupport.java:71)	at org.apache.activemq.util.ServiceStopper.stop(ServiceStopper.java:41)	at org.apache.activemq.broker.TransportConnector.stop(TransportConnector.java:283)	at org.apache.activemq.util.ServiceStopper.stop(ServiceStopper.java:41)	at org.apache.activemq.broker.BrokerService.stopAllConnectors(BrokerService.java:2208)	at org.apache.activemq.broker.BrokerService.stop(BrokerService.java:819)	at org.apache.activemq.transport.stomp.StompTestSupport.stopBroker(StompTestSupport.java:177)	at org.apache.activemq.transport.stomp.StompTestSupport.tearDown(StompTestSupport.java:116)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)	at org.junit.rules.RunRules.evaluate(RunRules.java:20)	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.junit.runners.Suite.runChild(Suite.java:128)	at org.junit.runners.Suite.runChild(Suite.java:27)	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264)	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124)	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:200)	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)