Class Not Found exception when including a GWT module project as a 'required project'

I'm trying to incorporate a GWT Module (A small MVP framework I'm working on) into a GWT project in development mode on the GWT development jetty server. I can do so if I copy the module's source directly into the project. I'm likewise successful if I include a jar containing the module in the project.

My preference, however, is to include the module as a 'required project' for the main project in eclipse, as both the module and the project are under active development. Unfortunately, when I do so the following error is printed to the console when I try to start up the main project in development mode:

WARNING: failed greetServlet: java.lang.NoClassDefFoundError: com/gmles/framework/client/AuthService
Aug 19, 2011 7:33:22 PM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@7ac412dd{/,/Users/logan/Documents/workspace/HCASchedule/war}: java.lang.NoClassDefFoundError: com/gmles/framework/client/AuthService
Aug 19, 2011 7:33:22 PM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed JettyContainerService$ApiProxyHandler@4c7335b1: java.lang.NoClassDefFoundError: com/gmles/framework/client/AuthService
Aug 19, 2011 7:33:22 PM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: Error starting handlers
java.lang.NoClassDefFoundError: com/gmles/framework/client/AuthService
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.mortbay.util.Loader.loadClass(Loader.java:91)
at org.mortbay.util.Loader.loadClass(Loader.java:71)
at org.mortbay.jetty.servlet.Holder.doStart(Holder.java:73)
at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:242)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:185)
at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerServi开发者_运维知识库ce.java:147)
at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:86)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:500)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1055)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:804)
at com.google.gwt.dev.DevMode.main(DevMode.java:309)
Caused by: java.lang.ClassNotFoundException: com.gmles.framework.client.AuthService
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 48 more

Any ideas on why this is happening?

Try putting the jar in your WEB-INF/lib folder.