title: Elastic MapReduce libjars argument to reference s3 jar files
body: <p>I'm trying to run a custom jar EMR job on Amazon and I have a reference to a lucene jar file in my jar file. I have the jar file in a lib directory on s3 and my Jar arguments look like this:</p>
  
  <pre><code>MyMainClass -libjars s3n://mybucket/lib/lucene-core-3.6.1.jar s3n://mybucket/myinput s3n://mybucket/myoutput
  </code></pre>
  
  <p>The job fails and I keep getting these errors:</p>
  
  <blockquote>
    <p>java.lang.NoClassDefFoundError: org/apache/lucene/analysis/Analyzer
      at java.lang.Class.forName0(Native Method)  at
    java.lang.Class.forName(Class.java:247)   at
    org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:861)
      at
    org.apache.hadoop.conf.Configuration.getClass(Configuration.java:906)
      at
    org.apache.hadoop.conf.Configuration.getClass(Configuration.java:932)
      at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:959)
      at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
      ... 14 more Caused by: java.lang.ClassNotFoundException:
    org.apache.lucene.analysis.Analyzer   at
    java.net.URLClassLoader$1.run(URLClassLoader.java:202)    at
    java.security.AccessController.doPrivileged(Native Method)    at
    java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at
    java.lang.ClassLoader.loadClass(ClassLoader.java:306)     at
    sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)     at
    java.lang.ClassLoader.loadClass(ClassLoader.java:247)     ... 21 more</p>
  </blockquote>
  
  <p>It doesn't seem to find the lucene jar file... What am I missing?</p>