Multi-module Maven and JPA Follow

My project is getting a NoClassDefFoundError when runing/debugging a GWT Configuration in IDEA.  It deploys fine to Tomcat.  This is a multi-module Maven project using Spring/Hibernate with one module (common) containing the JPA persistent classes and a web-app module depending on the common library artifact.  The root problem in a chain of exceptions is a NoClassDefFoundError looking for one of the persistent POJOs:

Caused by: java.lang.NoClassDefFoundError: target/classes/com/multideck/lpm/domain/Company (wrong name: com/multideck/lpm/domain/Company)

Why does it appear that IDEA is looking in the target/classes subdirectory instead of at the common.jar?  Thank you.