title: a lots of (Permission denied) in catalina.out
body: <p>How can i install Apache web server and Apache tomcat to avoid get errors like this:
  <br/><br/>
  <code>
  java.io.FileNotFoundException: /usr/local/apache-tomcat-7.0.5/work/Catalina/localhost/_/SESSIONS.ser (Permission denied)
  </code>
  <br/><br/>
  in /usr/local/apache-tomcat-7.0.5/logs/catalina.out
  <br/><br/>
  I think I should do something for Apache user, because when I <code>chmod 777 -R ./</code> on tomcat folder all errors disappear.</p>