title: maven java.lang.ClassNotFoundException: org.postgresql.Driver
body: <p>I have added following dependency into maven's pom.xml file</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;dependency&gt;
      &lt;groupId&gt;postgresql&lt;/groupId&gt;
      &lt;artifactId&gt;postgresql&lt;/artifactId&gt;
      &lt;version&gt;9.0-801.jdbc4&lt;/version&gt;
  &lt;/dependency&gt;
  </code></pre>
  
  <p>But it has not found the driver for the postgres database ?</p>
  
  <p>Please describe me where is the problem.</p>