本地mapReduce项目报错：java.lang.NullPointerException at java.lang.ProcessBuilder.start...
问题： java.lang.NullPointerException
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:482)
at org.apache.hadoop.util.Shell.run(Shell.
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