Caused by: java.lang.NullPointerException at java.util.Properties$LineReader.readLine(Properties.ja

最近突然想起来看一下spark源码，下载下spark源码之后debug突然发现不能运行报错如下

Exception in thread "main" java.lang.ExceptionInInitializerError
    at org.apache.spark.package$.(package.scala:91)
    at org.apache.spark.package$.(package.scala)
    at org.apache.spark.SparkContext$$anonfun$3.apply(SparkContext.scala:184)
	at org.apache.spark.SparkContext$$anonfun$3.apply(SparkContext.scala:184)
    at org.apache.spark.internal.Logging$class.logInfo(Logging.scala:54)
    at org.apache.spark.SparkContext.logInfo(SparkContext.scala:73)
    at org.apache.spark.SparkContext.(SparkContext.scala:184)
    at org.apache.sparktest.mytest$.main(mytest.scala:15)
    at org.apache.sparktest.mytest.main(mytest.scala)
Caused by: org.apache.spark.SparkException: Error while locating file spark-version-info.properties
    at org.apache.spark.package$SparkBuildInfo$.liftedTree1$1(package.scala:75)
    at org.apache.spark.package$SparkBuildInfo$.(package.scala:61)
    at org.apache.spark.package$SparkBuildInfo$.(package.scala)
    ... 9 more
Caused by: java.lang.NullPointerException
    at java.util.Properties$LineReader.readLine(Properties.java:434)
    at java.util.Properties.load0(Properties.java:353)
    at java.util.Properties.load(Properties.java:341)
    at org.apache.spark.package$SparkBuildInfo$.liftedTree1$1(package.scala:64)
    ... 11 more

请注意看下面的几行Caused by:后面的异常栈，发现是读取不到文件信息。那么它读取的是哪一个文件呢？
请看下图

当然了如果环境允许你可以自己编译产生这个文件，如果不允许你也可以下载spark编译之后的文件，找到spark-core包里面的这个properties文件。然后把它放入工程文件里面。

那么问题来了,挖掘机技术哪家强？

当然是看spark栈信息，点击异常栈进入错误的代码地方可以看到源码提示如下

      val resourceStream = Thread.currentThread().getContextClassLoader.
        getResourceAsStream(".idea/spark-version-info.properties")

接下来怎么做就不用我多说了吧