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https://issues.apache.org/jira/browse/OOZIE-2748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15711676#comment-15711676
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Peter Bacsko commented on OOZIE-2748:
-------------------------------------

Makes sense, using "null".

> NPE in LauncherMapper.printArgs()
> ---------------------------------
>
>                 Key: OOZIE-2748
>                 URL: https://issues.apache.org/jira/browse/OOZIE-2748
>             Project: Oozie
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 4.2.0
>            Reporter: Peter Bacsko
>            Assignee: Peter Bacsko
>         Attachments: OOZIE-2748-001.patch, OOZIE-2748-002.patch
>
>
> If we define argument for the Spark action like this
> {code}
>         <spark xmlns="uri:oozie:spark-action:0.2">
>             <job-tracker>${jobTracker}</job-tracker>
>             <name-node>${nameNode}</name-node>
>             <configuration>
>                 <property>
>                     <name>oozie.use.system.libpath</name>
>                     <value>true</value>
>                 </property>
>                 <property>
>                     <name></name>
>                     <value></value>
>                 </property>
>             </configuration>
>             <master>yarn-cluster</master>
>             <mode>cluster</mode>
>             <name>Something</name>
>             <class>package.of.my.Class</class>
>             <jar>${nameNode}/myjar.jar</jar>
>             <arg></arg>    <---  cause of the NPE
>         </spark>
> {code}
> then we get a NullPointerException in LauncherMapper:
> {code}
> Failing Oozie Launcher, Main class 
> [org.apache.oozie.action.hadoop.SparkMain], exception invoking main(), null
> java.lang.NullPointerException
>       at 
> org.apache.oozie.action.hadoop.LauncherMapper.printArgs(LauncherMapper.java:627)
>       at 
> org.apache.oozie.action.hadoop.LauncherMapper.map(LauncherMapper.java:212)
>       at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
> ...
> {code}



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