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org.apache.spark.SparkException: Task not serializable	at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:298)	at org.apache.spark.util.ClosureCleaner$.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$mapPartitionsWithIndex$1.apply(RDD.scala:798)	at org.apache.spark.rdd.RDD$$anonfun$mapPartitionsWithIndex$1.apply(RDD.scala:797)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)	at org.apache.spark.rdd.RDD.withScope(RDD.scala:358)	at org.apache.spark.rdd.RDD.mapPartitionsWithIndex(RDD.scala:797)	at org.apache.spark.sql.execution.WholeStageCodegenExec.doExecute(WholeStageCodegenExec.scala:364)	at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:115)	at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:115)	at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:136)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)	at org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:133)	at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:114)	at org.apache.spark.sql.execution.TakeOrderedAndProjectExec.executeCollect(limit.scala:128)	at org.apache.spark.sql.Dataset$$anonfun$org$apache$spark$sql$Dataset$$execute$1$1.apply(Dataset.scala:2183)	at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:57)	at org.apache.spark.sql.Dataset.withNewExecutionId(Dataset.scala:2532)	at org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$execute$1(Dataset.scala:2182)	at org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$collect(Dataset.scala:2189)	at org.apache.spark.sql.Dataset$$anonfun$head$1.apply(Dataset.scala:1925)	at org.apache.spark.sql.Dataset$$anonfun$head$1.apply(Dataset.scala:1924)	at org.apache.spark.sql.Dataset.withTypedCallback(Dataset.scala:2562)	at org.apache.spark.sql.Dataset.head(Dataset.scala:1924)	at org.apache.spark.sql.Dataset.take(Dataset.scala:2139)	at org.mksmart.amaretto.ml.DatasetPerHourVerOneTest.testBuildDatasetNew(DatasetPerHourVerOneTest.java:202)	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:497)	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.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)	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.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)