I have added jetty mvn plugin code in my project pom.xml.
org.mortbay.jetty
That's what worked for me in a multimodule Maven project in Eclipse:
1 Open Run Configurations dialog.
2.Look at the “Base Directory:” Is there really the directory of your webapp’s submodule or is it the parent module’s directory?
3 If it is the latter, click on “Workspace” button and select the submodule’s (webapp’s) directory.