脚本宝典收集整理的这篇文章主要介绍了记录使用nutch执行inject的时候遇到的第一个坑 java.lang.NullPointerException，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。
$ ./nutch inject urls InjectorJob: starting at 2016-11-08 11:20:12 InjectorJob: Injecting urlDir: urls InjectorJob: Using class org.apache.gora.mongodb.Store.MongoStore as the Gora st orage class. InjectorJob: java.lang.NullPointerException at java.lang.PRocessBuilder.start(ProcessBuilder.java:1010) at org.apache.hadoop.util.Shell.runCommand(Shell.java:482) at org.apache.hadoop.util.Shell.run(Shell.java:455) at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java: 702) at org.apache.hadoop.util.Shell.execCommand(Shell.java:791) at org.apache.hadoop.util.Shell.execCommand(Shell.java:774) at org.apache.hadoop.fs.RawLocalFileSystem.setPErmission(RawLocalFileSys tem.java:646) at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.jav a:434) at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:28 1) at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmi ssionFiles.java:125) at org.apache.hadoop.mapreduce.JobSubmITter.submitJobInternal(JobSubmitt er.java:348) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1285) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1282) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInforma tion.java:1614) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1282) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1303) at org.apache.nutch.util.NutchJob.waitForCompletion(NutchJob.java:115) at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:231) at org.apache.nutch.crawl.InjectorJob.inject(InjectorJob.java:252) at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:275) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.nutch.crawl.InjectorJob.main(InjectorJob.java:284) 源码参见:hadoop-common-{version}.jar , Shell.java line 370 : winUtilsPath = getQualifiedBinPath("winutils.exe"); 调用链中：函数checkHadoopHome() 找不到hadoop安装目录引起的报NPE
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