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https://issues.apache.org/jira/browse/HADOOP-8778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450697#comment-13450697
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Harsh J commented on HADOOP-8778:
---------------------------------
What version of Hadoop are you running into this error on? It is not 0.23.1 as
you have marked here, since
http://svn.apache.org/viewvc/hadoop/common/tags/release-0.23.1/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JobClient.java?view=markup
does not show line 226 as a match with the stack trace.
> Null pointer exception when trying to get job name by job id from jobClient
> ---------------------------------------------------------------------------
>
> Key: HADOOP-8778
> URL: https://issues.apache.org/jira/browse/HADOOP-8778
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Affects Versions: 0.23.1
> Reporter: Emir Ibrahimbegovic
>
> Consider the following code :
> public static void main(String[] args) throws IOException {
> Configuration conf = HBaseConfiguration.create();
> conf.set("hbase.zookeeper.quorum",
> "zk1.myhost,zk2.myhost,zk3.myhost");
> conf.set("hbase.zookeeper.property.clientPort", "2181");
> InetSocketAddress jobtracker = new
> InetSocketAddress("jobtracker.mapredhost.myhost", 8021);
> JobClient jobClient = new JobClient(jobtracker, conf);
> JobStatus[] jobs = jobClient.jobsToComplete();
> for (int i = 0; i < jobs.length; i++) {
> JobStatus js = jobs[i];
> if (js.getRunState() == JobStatus.RUNNING) {
> JobID jobId = js.getJobID();
> System.out.println(jobId);
> }
> }
> }
> Code above works without errors but if you add this extra line :
> System.out.println(jobClient.getJob(jobId).getJobName());
> This exception occurs :
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.JobClient$NetworkedJob.<init>(JobClient.java:226)
> at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:1080)
> Fix is to add set configuration to jobclient again "jobClient.setConf(conf);"
> even if it was instantiated using InetSocketAddress and Configuration (see
> code above).
> If you look at line 225 JobClient :
> Configuration conf = JobClient.this.getConf();
> this.completionPollIntervalMillis =
> conf.getInt(COMPLETION_POLL_INTERVAL_KEY,
> DEFAULT_COMPLETION_POLL_INTERVAL); //NPE occurs here!
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