Confluence plugins may define downloadable resources. If your plugin requires Confluence serve additional static files such as images, Javascript or CSS, you will need to use downloadable plugin resources to make them available.

Due to a bug in Confluence versions 1.4 through 1.4.2, downloadable plugin resources only function for plugins that have been deployed by copying them into confluence/WEB-INF/lib. Plugins that have been uploaded dynamically through the web interface, or copied into confluence.home/plugins will not be able to serve resources. This bug is fixed for Confluence 1.4.3.