I just ran into this problem myself. Here's the uncaught exception that gets thrown when you try to login or deploy to App Engine:
!ENTRY org.eclipse.ui 4 0 2011-07-14 10:40:51.555 !MESSAGE Unhandled event loop exception !STACK 0 java.lang.LinkageError: loader constraint violation: when resolving method "com.google.gdt.eclipse.login.LoginCallbackServer.addServlet(Ljava/lang/String;Ljavax/servlet/Servlet;)V" the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current class, com/google/gdt/eclipse/login/LoginCallbackServer, and the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) for resolved class, com/google/gdt/eclipse/login/LoginCallbackServer, have different Class objects for the type javax/servlet/Servlet used in the signature at com.google.gdt.eclipse.login.LoginCallbackServer.<init>(LoginCallbackServer.java:137) at com.google.gdt.eclipse.login.GoogleLogin.logIn(GoogleLogin.java:403) at com.google.appengine.eclipse.core.deploy.ui.DeployProjectHandler.execute(DeployProjectHandler.java:51) at com.google.appengine.eclipse.core.deploy.ui.DeployProjectAction.run(DeployProjectAction.java:13) I did my best to figure out how to resolve the conflict by loading various versions of the servlet-api.jar ahead of the version in the App Engine SDK, but no joy. I don't know who could best resolve this the Genuitec or the Google plugin team, but I couldn't figure it out in the time I devoted to it. I finally did a fresh install of the basic (not MyEclipse) Eclipse Java (time to try Indigo anyway) and added the Google plugins and SDKs and deployed to App Engine from there. I now have an Eclipse with just the Android plugins, an Eclipse with App Engine and GWT for App Engine projects and MyEclipse which I use for web projects with GWT (but not deployed on App Engine). It's a bit of a bother, but my experience is that there are always conflicts with Eclipse that can be minimized with this sort of segregation. Not the answer you were looking for, but it's how I got it working. Roland -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/oH89hQAFKpcJ. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
