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javax.management.InstanceAlreadyExistsException: org.apache.flume.channel:type=null	at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)	at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)	at org.apache.flume.instrumentation.MonitoredCounterGroup.register(MonitoredCounterGroup.java:108)	at org.apache.flume.instrumentation.MonitoredCounterGroup.start(MonitoredCounterGroup.java:88)	at org.apache.flume.channel.MemoryChannel.start(MemoryChannel.java:345)	at org.apache.spark.streaming.flume.sink.SparkSinkSuite$$anonfun$2.apply$mcV$sp(SparkSinkSuite.scala:63)	at org.apache.spark.streaming.flume.sink.SparkSinkSuite$$anonfun$2.apply(SparkSinkSuite.scala:61)	at org.apache.spark.streaming.flume.sink.SparkSinkSuite$$anonfun$2.apply(SparkSinkSuite.scala:61)	at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)	at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)	at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)	at org.scalatest.Transformer.apply(Transformer.scala:22)	at org.scalatest.Transformer.apply(Transformer.scala:20)	at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)	at org.scalatest.Suite$class.withFixture(Suite.scala:1122)	at org.scalatest.FunSuite.withFixture(FunSuite.scala:1555)	at org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)	at org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)	at org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)	at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)	at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:175)	at org.scalatest.FunSuite.runTest(FunSuite.scala:1555)	at org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)	at org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)	at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)	at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)	at scala.collection.immutable.List.foreach(List.scala:318)	at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)	at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)	at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)	at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:208)	at org.scalatest.FunSuite.runTests(FunSuite.scala:1555)	at org.scalatest.Suite$class.run(Suite.scala:1424)	at org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1555)	at org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)	at org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)	at org.scalatest.SuperEngine.runImpl(Engine.scala:545)	at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:212)	at org.scalatest.FunSuite.run(FunSuite.scala:1555)	at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:55)	at org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2563)	at org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2557)	at scala.collection.immutable.List.foreach(List.scala:318)	at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2557)	at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1044)	at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1043)	at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2722)	at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1043)	at org.scalatest.tools.Runner$.run(Runner.scala:883)	at org.scalatest.tools.Runner.run(Runner.scala)	at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:144)	at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:35)	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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)