Getting NullPointerException when running Spark Code in Zeppelin 0.7.1

Question

I have installed Zeppelin 0.7.1. When I tried to execute the Example spark program(which was available with Zeppelin Tutorial notebook), I am getting the following error

java.lang.NullPointerException
    at org.apache.zeppelin.spark.Utils.invokeMethod(Utils.java:38)
    at org.apache.zeppelin.spark.Utils.invokeMethod(Utils.java:33)
    at org.apache.zeppelin.spark.SparkInterpreter.createSparkContext_2(SparkInterpreter.java:391)
    at org.apache.zeppelin.spark.SparkInterpreter.createSparkContext(SparkInterpreter.java:380)
    at org.apache.zeppelin.spark.SparkInterpreter.getSparkContext(SparkInterpreter.java:146)
    at org.apache.zeppelin.spark.SparkInterpreter.open(SparkInterpreter.java:828)
    at org.apache.zeppelin.interpreter.LazyOpenInterpreter.open(LazyOpenInterpreter.java:70)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer$InterpretJob.jobRun(RemoteInterpreterServer.java:483)
    at org.apache.zeppelin.scheduler.Job.run(Job.java:175)
    at org.apache.zeppelin.scheduler.FIFOScheduler$1.run(FIFOScheduler.java:139)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

I have also setup the config file(zeppelin-env.sh) to point to my Spark installation & Hadoop configuration directory

export SPARK_HOME="/${homedir}/sk"
export HADOOP_CONF_DIR="/${homedir}/hp/etc/hadoop"

The Spark version I am using is 2.1.0 & Hadoop is 2.7.3

Also I am using the default Spark Interpreter Configuration(so Spark is set to run in Local mode)

Am I missing something here?

PS : I am able to connect to spark from the Terminal using spark-shell

Solution 1

Just now I got solution of this issue for Zeppelin-0.7.2:

Root Cause is : Spark trying to setup Hive context, but hdfs services is not running, that's why HiveContext become null and throwing null pointer exception.

Solution:
1. Setup Saprk Home [optional] and HDFS.
2. Run HDFS service
3. Restart zeppelin server
OR
1. Go to Zeppelin's Interpreter settings.
2. Select Spark Interpreter
3. zeppelin.spark.useHiveContext = false

Solution 2

Finally, I am able to find out the reason. When I checked the logs in ZL_HOME/logs directory, find out it seems to be the Spark Driver binding error. Added the following property in Spark Interpreter Binding and works good now...

PS : Looks like this issue comes up mainly if you connect to VPN...and I do connect to VPN

Solution 3

Did you set right SPARK_HOME? Just wondered what sk is in your export SPARK_HOME="/${homedir}/sk"

(I just wanted to comment below your question but couldn't, due to my lack of reputation😭)