title: java.lang.NoClassDefFoundError: javax.activation.DataHandler in android
body: <p>I am making a email sending application in android phone. For that I included two jar file <code>activation. jar</code> and <code>mail.jar</code>. But when I run this application and try to send the mail, I got following error on <code>LogCat</code>.</p>
  
  <pre><code>java.lang.NoClassDefFoundError: javax.activation.DataHandler 
  </code></pre>
  
  <p>I am new to android. so I am not able to figure out this issue. please Help me. Thanks</p>