title: Import Error in Hadoop Mapreduce in Eclipse
body: <p>I was trying to compile some Hadoop 2.3.0 mapreduce jobs in Eclipse. I imported the following jars </p>
  
  <pre><code>hadoop-mapreduce-client-core-2.3.0.jar
  commons-cli-1.2.jar
  hadoop-common-2.3.0.jar
  </code></pre>
  
  <p>However whenever I import the org.apache.hadoop.mapreduce.Mapper I get the following error</p>
  
  <pre><code> The class file Mapper&lt;KEYIN,VALUEIN,KEYOUT,VALUEOUT&gt; contains a signature '(Lorg/apache/hadoop/mapreduce/
       Mapper&lt;TKEYIN;TVALUEIN;TKEYOUT;TVALUEOUT;&gt;.Context;)V' ill-formed at position 74
  </code></pre>
  
  <p>I can't find any error like this online, so I wonder what it might be.</p>