title: how to run a java class on android project?
body: <p>i have writing an app with an android client and a server java. All the classes are in one package, but when i run my project i have this mistake:</p>
  
  <pre><code>guarantee(_name_index != 0 &amp;&amp; _signature_index != 0) failed: bad constant pool index for fieldDescriptor
  </code></pre>
  
  <p>i read that it is because my server is written in java and not in android. so what can i do for test my code? i have create also a Java Project only for the server, but i don't know how import and link them. </p>