title: Hadoop 3.3 and oozie 5.2.0
body: <p>I am using <code>hadoop 3.3</code> and <code>oozie 5.2.0</code>.</p>
  <p>I am getting below error:</p>
  <pre><code>Exception in thread &quot;main&quot; java.lang.NullPointerException
      at org.apache.hadoop.yarn.client.api.impl.AMRMClientImpl.unregisterApplicationMaster(AMRMClientImpl.java:519)
      at org.apache.hadoop.yarn.client.api.async.impl.AMRMClientAsyncImpl.unregisterApplicationMaster(AMRMClientAsyncImpl.java:220)
      at org.apache.oozie.action.hadoop.LauncherAM.unregisterWithRM(LauncherAM.java:354)
      at org.apache.oozie.action.hadoop.LauncherAM.run(LauncherAM.java:280)
      at org.apache.oozie.action.hadoop.LauncherAM$1.run(LauncherAM.java:155)
      at java.security.AccessController.doPrivileged(Native Method)
      at javax.security.auth.Subject.doAs(Subject.java:422)
      at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1845)
      at org.apache.oozie.action.hadoop.LauncherAM.main(LauncherAM.java:143)
  </code></pre>