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我想在Windows上使用cassandra從eclipse運行apache nutch。這是我得到的錯誤。越來越java.lang.NullPointerException當試圖從eclipse與卡桑德拉數據存儲運行nutch
InjectorJob: starting at 2017-02-17 17:35:42
InjectorJob: Injecting urlDir: C:/Users/STAN/Desktop/trunk/urls/seeds.txt
InjectorJob: Using class org.apache.gora.cassandra.store.CassandraStore as the Gora storage 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(RawLocalFileSystem.java:646)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:434)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:281)
at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:125)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.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(UserGroupInformation.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:246)
at org.apache.nutch.crawl.InjectorJob.inject(InjectorJob.java:267)
at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:290)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.nutch.crawl.InjectorJob.main(InjectorJob.java:299)