Handling Errors

• When something goes wrong, you must consider
  • How much to tell the client.
  • How to record the problem.
  • How to recover from the problem.
• You can change the standard error page in web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">
<web-app>
  <error-page>
    <error-code>
      400
    </error-code>
    <location>
      /400.html
    </location>
  </error-page>
    <error-page>
    <error-code>
      404
    </error-code>
    <location>
      /404.html
    </location>
  </error-page>
</web-app>