title: The import javax.servlet and org.hibernate cannot be resolved - Eclipse Kepler on Ubuntu 12.04
body: <p>I installed latest version of Eclipse Java EE Kepler version.<br>
  And tried to write easy program on Java. But when I make some import statements I catch message:</p>
  
  <pre><code>The import xxx cannot be resolved.
  </code></pre>
  
  <p>It doesn't work for - <code>javax.servlet, org.hibernate, org.springframework, org.junit</code>.</p>
  
  <p>I don't know why exactly this happen. I'm using 1.7 JDK + tomcat 7. Current OS is Ubuntu 12.04.<br>
  I added tomcat 7 to eclipse, and SpringSource Tool Suite for Eclipse Kepler.</p>
  
  <p><em><strong>How to solve this trouble?</em></strong></p>