title: caused by:java.lang.NoClassDefRoundError:com/mchange/v2/ser/indirector
body: <p>When I try to use <code>c3p0</code> to test a <code>mysql</code> database connection, Eclipse shows the following error:</p>
  
  <pre><code>caused by:java.lang.NoClassDefFoundError:com/mchange/v2/ser/indirector,
  </code></pre>
  
  <p>I googled and was unable to find an answer.</p>
  
  <p>Could anyone help me? I am a java rookie, thanks!</p>