Question

I have a mapreduce code that submits job using JobClient . I keep getting this null pointer error stack

12/12/10 12:42:44 INFO mapred.LocalJobRunner: OutputCommitter set in config null    
Exception in thread "main" java.lang.NullPointerException
        at org.apache.hadoop.mapred.JobClient$NetworkedJob.<init>(JobClient.java:226)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:924)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:844)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
        at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:844)
        at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:818)
        at FTPIF.run(FTPIF.java:193)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
        at FTPIF.main(FTPIF.java:273)

The piece of code that gets me this error is

JobClient j = new JobClient();
        j.init(conf);
        RunningJob check = j.submitJob(conf);

Any ideas ?

Answer 1

I never figured out why I hit on the null pointer . Setting j.setConf(conf) also did not work . So I used runJob instead to get a handle on the running job .

RunningJob job= JobClient.runJob(conf);