Spark异常：org/codehaus/janino/InternalCompilerException

执行SparkSQL时出现异常：

Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/janino/InternalCompilerException
    at org.apache.spark.sql.catalyst.expressions.codegen.GenerateSafeProjection$.create(GenerateSafeProjection.scala:197)
    at org.apache.spark.sql.catalyst.expressions.codegen.GenerateSafeProjection$.create(GenerateSafeProjection.scala:36)
    at org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator.generate(CodeGenerator.scala:1321)
    at org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$collectFromPlan(Dataset.scala:3272)
    at org.apache.spark.sql.Dataset$$anonfun$head$1.apply(Dataset.scala:2484)
    at org.apache.spark.sql.Dataset$$anonfun$head$1.apply(Dataset.scala:2484)
    at org.apache.spark.sql.Dataset$$anonfun$52.apply(Dataset.scala:3254)
    at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:77)
    at org.apache.spark.sql.Dataset.withAction(Dataset.scala:3253)
    at org.apache.spark.sql.Dataset.head(Dataset.scala:2484)
    at org.apache.spark.sql.Dataset.take(Dataset.scala:2698)
    at org.apache.spark.sql.Dataset.showString(Dataset.scala:254)
    at org.apache.spark.sql.Dataset.show(Dataset.scala:723)
    at org.apache.spark.sql.Dataset.show(Dataset.scala:682)
    at org.apache.spark.sql.Dataset.show(Dataset.scala:691)
Caused by: java.lang.ClassNotFoundException: org.codehaus.janino.InternalCompilerException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 17 more

解决方法：
1、缺少包，在项目pom.xml文件添加依赖：

<dependency>
	<groupId>org.codehaus.janino</groupId>
	<artifactId>janino</artifactId>
	<version>3.0.8</version>
</dependency>

2、添加依赖后如果仍报错则需考虑是jar包出现了冲突:
如下图中，我引入的spark-core包中也存在janino，版本之间的差异导致出现了冲突。

因此需要将spark-core中的janino剔除掉，再添加janino依赖(或者直接添加相同版本的依赖包应该也可以，总之不产生冲突就可以了):

注意:spark-core中剔除的janino为3.0.0版本，因此单独引入的janino也应该是3.0.0版本，不然依旧存在版本冲突问题。

<dependency>
   <groupId>org.apache.spark</groupId>
   <artifactId>spark-sql_2.11.8</artifactId>
   <version>2.2.0</version>
   <exclusions>
   		<exclusion>
       		<groupId>org.codehaus.janino</groupId>
       		<artifactId>janino</artifactId>
   		</exclusion>
   		<exclusion>
       		<groupId>org.codehaus.janino</groupId>
       		<artifactId>commons-compiler</artifactId>
   		</exclusion>
   </exclusions>
</dependency>

<dependency>
	<groupId>org.codehaus.janino</groupId>
	<artifactId>janino</artifactId>
	<version>3.0.0</version>
</dependency>