title: What does "Error: Could not find or load main class org.apache.hadoop.util.RunJar"?
body: <p>I am trying to run an example as it is pointed in <a href="http://www.manning.com/lam/" rel="noreferrer">Hadoop in Action book</a>  page 15. 
  this is the command that needs to be run : </p>
  
  <pre><code>bin/hadoop jar hadoop-*-examples.jar
  </code></pre>
  
  <p>but I get this error </p>
  
  <pre><code>"Error: Could not find or load main class org.apache.hadoop.util.RunJar"
  </code></pre>
  
  <p>It seems like a classpath issue or something. Can someone point out some guideline ? </p>
  
  <p>Actually I am not able to run any of hadoop commands like version, fs, jar ... and so on .. ! </p>
  
  <p>NOTE: I am using windows. </p>