title: Exception in thread "main" java.io.IOException: Error opening job jar: ex.jar in hadoop
body: <p>Can someone explain how to resolve this error:</p>
  
  <pre><code>    Caused by: java.util.zip.ZipException: error in opening zip file
      at java.util.zip.ZipFile.open(Native Method)
      at java.util.zip.ZipFile.&lt;init&gt;(ZipFile.java:127)
      at java.util.jar.JarFile.&lt;init&gt;(JarFile.java:135)
      at java.util.jar.JarFile.&lt;init&gt;(JarFile.java:72)
      at org.apache.hadoop.util.RunJar.main(RunJar.java:122)&lt;code&gt;*/
  </code></pre>