How to customize the Page Not Found (404) page
Platform notice: Server and Data Center only. This article only applies to Atlassian products on the server and data center platforms.
The content on this page includes steps to customize or extend Atlassian software (adding/changing CSS rules, HTML, JavaScript, etc.). Per the Atlassian Support Offerings, support does not include customizations made to Atlassian products. Be aware that this material is provided for your information only and using it is done so at your risk.
If you have any questions about this or any customization, please ask the community at Atlassian Answers or consider working with an Atlassian Solution Partner.
Purpose
To customize the 404 error page served by Confluence, in order to better fit the design of your site.
Solution
Modify '404.vm'
Find the file 404.vm that's located in <CONFLUENCE-INSTALLATION-PATH>/confluence directory. (see Velocity Template Overview for further information about Velocity template language)
Create a Custom .jsp and Modify 'web.xml'
Find the file web.xml that's located in <CONFLUENCE-INSTALLATION-PATH>/confluence/WEB-INF directory. Edit the file and find the following line:
<error-page>
<error-code>404</error-code>
<location>/fourohfour.action</location>
</error-page>Replace the fourohfour.action with the new custom .jsp page that you created. The default path is <CONFLUENCE-INSTALLATION-PATH>/confluence/.