Spark Shell由于Scala编译器原因不能正常启动

使用SBT安装完成Spark后，可以运行示例，但是尝试运行spark-shell就会报错：

D:\Scala\spark\bin\spark-shell.cmd  
SLF4J: Class path contains multiple SLF4J bindings.    
SLF4J: Found binding in [jar:file:/D:/Scala/spark/assembly/target/scala-2.10/spark-assembly-0.9.0-incubating-hadoop1.0.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]    
SLF4J: Found binding in [jar:file:/D:/Scala/spark/tools/target/scala-2.10/spark-tools-assembly-0.9.0-incubating.jar!/org/slf4j/impl/StaticLoggerBinder.class]    
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.    
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]    
14/04/03 20:40:43 INFO HttpServer: Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties    
14/04/03 20:40:43 INFO HttpServer: Starting HTTP Server

Failed to initialize compiler: object scala.runtime in compiler mirror not found.  
** Note that as of 2.8 scala does not assume use of the java classpath.    
** For the old behavior pass -usejavacp to scala, or if using a Settings    
** object programatically, settings.usejavacp.value = true.    
14/04/03 20:40:44 WARN SparkILoop$SparkILoopInterpreter: Warning: compiler accessed before init set up.  Assuming no postInit code.

Failed to initialize compiler: object scala.runtime in compiler mirror not found.  
** Note that as of 2.8 scala does not assume use of the java classpath.    
** For the old behavior pass -usejavacp to scala, or if using a Settings    
** object programatically, settings.usejavacp.value = true.    
Failed to initialize compiler: object scala.runtime in compiler mirror not found.    
        at scala.Predef$.assert(Predef.scala:179)    
        at org.apache.spark.repl.SparkIMain.initializeSynchronous(SparkIMain.scala:197)    
        at org.apache.spark.repl.SparkILoop$$anonfun$process$1.apply$mcZ$sp(SparkILoop.scala:919)    
        at org.apache.spark.repl.SparkILoop$$anonfun$process$1.apply(SparkILoop.scala:876)    
        at org.apache.spark.repl.SparkILoop$$anonfun$process$1.apply(SparkILoop.scala:876)    
        at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)    
        at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:876)    
        at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:968)    
        at org.apache.spark.repl.Main$.main(Main.scala:31)    
        at org.apache.spark.repl.Main.main(Main.scala)

Google之还是不求解。只是在SBT的网站上看到Q&A里面有个问题提到了：http://www.scala-sbt.org/release/docs/faq#how-do-i-use-the-scala-interpreter-in-my-code。这里说代码中怎么修改设置。显然不适合我。

继续求解。注意到错误提示是在2.8以后才有的，原因是有一个关于编译器解释权Classpath的提议被接受了：Default compiler/interpreter classpath in a managed environment。

继续在Google中找，有一篇论文吸引了我的注意：Object Scala Found。里面终于找到一个办法：

“

However, a working command can be recovered, like so:  
$ jrunscript -Djava.class.path=scala-library.jar -Dscala.usejavacp=true -classpath scala-compiler.jar -l scala

”

于是修改一下\bin\spark-class2.cmd:

rem Set JAVA_OPTS to be able to load native libraries and to set heap size  
set JAVA_OPTS=%OUR_JAVA_OPTS% -Djava.library.path=%SPARK_LIBRARY_PATH% -Dscala.usejavacp=true -Xms%SPARK_MEM% -Xmx%SPARK_MEM%    
rem Attention: when changing the way the JAVA_OPTS are assembled, the change must be reflected in ExecutorRunner.scala!

标红的部分即是心添加的一个参数。再次运行\bin\spark-shell.cmd:

D:>D:\Scala\spark\bin\spark-shell.cmd    
SLF4J: Class path contains multiple SLF4J bindings.    
SLF4J: Found binding in [jar:file:/D:/Scala/spark/assembly/target/scala-2.10/spark-assembly-0.9.0-incubating-hadoop1.0.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]    
SLF4J: Found binding in [jar:file:/D:/Scala/spark/tools/target/scala-2.10/spark-tools-assembly-0.9.0-incubating.jar!/org/slf4j/impl/StaticLoggerBinder.class]    
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.    
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]    
14/04/03 22:18:41 INFO HttpServer: Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties    
14/04/03 22:18:41 INFO HttpServer: Starting HTTP Server    
Welcome to    
      ____              __    
     / __/__  ___ _____/ /__    
    _\ \/ _ \/ _ `/ __/  '_/    
   /___/ .__/\_,_/_/ /_/\_\   version 0.9.0    
      /_/

Using Scala version 2.10.3 (Java HotSpot(TM) Client VM, Java 1.6.0_10)  
Type in expressions to have them evaluated.    
Type :help for more information.    
14/04/03 22:19:12 INFO Slf4jLogger: Slf4jLogger started    
14/04/03 22:19:13 INFO Remoting: Starting remoting    
14/04/03 22:19:16 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://spark@Choco-PC:5960]    
14/04/03 22:19:16 INFO Remoting: Remoting now listens on addresses: [akka.tcp://spark@Choco-PC:5960]    
14/04/03 22:19:16 INFO SparkEnv: Registering BlockManagerMaster    
14/04/03 22:19:17 INFO DiskBlockManager: Created local directory at C:\Users\Choco\AppData\Local\Temp\spark-local-20140403221917-7172    
14/04/03 22:19:17 INFO MemoryStore: MemoryStore started with capacity 304.8 MB.    
14/04/03 22:19:18 INFO ConnectionManager: Bound socket to port 5963 with id = ConnectionManagerId(Choco-PC,5963)    
14/04/03 22:19:18 INFO BlockManagerMaster: Trying to register BlockManager    
14/04/03 22:19:18 INFO BlockManagerMasterActor$BlockManagerInfo: Registering block manager Choco-PC:5963 with 304.8 MB RAM    
14/04/03 22:19:18 INFO BlockManagerMaster: Registered BlockManager    
14/04/03 22:19:18 INFO HttpServer: Starting HTTP Server    
14/04/03 22:19:18 INFO HttpBroadcast: Broadcast server started at http://192.168.1.100:5964    
14/04/03 22:19:18 INFO SparkEnv: Registering MapOutputTracker    
14/04/03 22:19:18 INFO HttpFileServer: HTTP File server directory is C:\Users\Choco\AppData\Local\Temp\spark-e122cfe9-2d62-4a47-920c-96b54e4658f6    
14/04/03 22:19:18 INFO HttpServer: Starting HTTP Server    
14/04/03 22:19:22 INFO SparkUI: Started Spark Web UI at http://Choco-PC:4040    
14/04/03 22:19:22 INFO Executor: Using REPL class URI: http://192.168.1.100:5947    
Created spark context..    
Spark context available as sc.

scala> :quit
Stopping spark context.
14/04/03 23:05:21 INFO MapOutputTrackerMasterActor: MapOutputTrackerActor stopped!
14/04/03 23:05:21 INFO ConnectionManager: Selector thread was interrupted!
14/04/03 23:05:21 INFO ConnectionManager: ConnectionManager stopped
14/04/03 23:05:21 INFO MemoryStore: MemoryStore cleared
14/04/03 23:05:21 INFO BlockManager: BlockManager stopped
14/04/03 23:05:21 INFO BlockManagerMasterActor: Stopping BlockManagerMaster
14/04/03 23:05:21 INFO BlockManagerMaster: BlockManagerMaster stopped
14/04/03 23:05:21 INFO SparkContext: Successfully stopped SparkContext
14/04/03 23:05:21 INFO RemoteActorRefProvider$RemotingTerminator: Shutting down remote daemon.
14/04/03 23:05:21 INFO RemoteActorRefProvider$RemotingTerminator: Remote daemon shut down; proceeding with flushing remote transports.

Good。浏览器打开http://Choco-PC:4040，就可以看到Spark的状态、环境、执行者等信息了。

这个Fix可能只是适用与我的情况。如果还有问题可以再找找相关的资料。

期间还碰到不能找到文件的错误。最后发现是JAVA_HOME设置没有对。如果你碰到问题了，可以打开脚本的回显，然后找找原因。