Possible cause -
1. Problem with the configuration within application.xml.
2. Deleting / closing the projects.
Possible Resolution -
1. Verify the application.xml entries within ear project to see if there are multiple entries for a project. If not ,
2. Make sure there shouldn't be any project entry in application.xml which doesn't exist. Delete the problematic entry if required.
3. Sometime it just get resolved by just putting a space somewhere in application.xml and save.