I\'ve run into this problem a few times and only just stumbled upon a (semi-) reliable solution, so thought I would post it here in case it helps anyone else, or in case I f
I ran into this problem today, on a project that had been working for a long time. I tried all of the above solutions, but (1) I wasn't seeing the warning in the Problems panel as the poster had; (2) my Deployment Assembly Java Build Path Entries was not showing anything else available to deploy; (3) the .classpath entry for org.eclipse.jst.component.dependency was already there; and (4) I already had Maven Integration for WTP installed. I finally removed my project from the Tomcat server and then re-deployed it, and the problem disappeared.