As this is unanswered, I am guessing something other than Maven dependencies are wrong with the ops build.

While not using Maven, I have the same problem from time to time when re-creating my development environment from svn, and I always forget why and have to figure it out. Unfortunately it seems this is a problem with Eclipse.

I am able to remove all such errors from once working projects by picking just one of the dynamic web projects, or just tomcat dependent projects, and move a dependency in the build order. This seems to force all projects to rebuild properly and all of the errors are then resolved.

Right click on a web project, select “build Path” -> “Configure Build Path”.
Go to the tab “Order and Export”, then pick a library or jar entry and move it up or down. I used the JRE System Library and moved it to the top.

Click OK, and all that red goes away!