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java.io.NotSerializableException: test.spark.service.SparkServiceImpl
Serialization stack:
    - object not serializable (class: test.spark.service.SparkServiceImpl, value: test.spark.service.SparkServiceImpl@47b269c4)
    - field (class: test.spark.service.SparkServiceImpl$1, name: this$0, type: class test.spark.service.SparkServiceImpl)
    - object (class test.spark.service.SparkServiceImpl$1, test.spark.service.SparkServiceImpl$1@23ad71bf)
    - field (class: org.apache.spark.api.java.JavaPairRDD$$anonfun$toScalaFunction$1, name: fun$1, type: interface org.apache.spark.api.java.function.Function)
    - object (class org.apache.spark.api.java.JavaPairRDD$$anonfun$toScalaFunction$1, <function1>)	at org.apache.spark.serializer.SerializationDebugger$.improveException(SerializationDebugger.scala:40)	at org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:46)	at org.apache.spark.serializer.JavaSerializerInstance.serialize(JavaSerializer.scala:100)	at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:295)	at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:288)	at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:108)	at org.apache.spark.SparkContext.clean(SparkContext.scala:2037)	at org.apache.spark.rdd.RDD$$anonfun$groupBy$3.apply(RDD.scala:694)	at org.apache.spark.rdd.RDD$$anonfun$groupBy$3.apply(RDD.scala:693)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)	at org.apache.spark.rdd.RDD.withScope(RDD.scala:358)	at org.apache.spark.rdd.RDD.groupBy(RDD.scala:693)	at org.apache.spark.rdd.RDD$$anonfun$groupBy$1.apply(RDD.scala:665)	at org.apache.spark.rdd.RDD$$anonfun$groupBy$1.apply(RDD.scala:665)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)	at org.apache.spark.rdd.RDD.withScope(RDD.scala:358)	at org.apache.spark.rdd.RDD.groupBy(RDD.scala:664)	at org.apache.spark.api.java.JavaRDDLike$class.groupBy(JavaRDDLike.scala:242)	at org.apache.spark.api.java.AbstractJavaRDDLike.groupBy(JavaRDDLike.scala:45)	at test.spark.service.SparkServiceImpl.process(SparkServiceImpl.java:32)	at test.spark.service.SparkServiceTest.testProcess(SparkServiceTest.java:27)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	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.InvokeMethod.evaluate(InvokeMethod.java:17)	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)	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.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)