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我正在尝试创建一个Lift应用程序，可以在App Engine上运行，并使用sbt管理项目。我有web.xml和appengine-web.xml在src/main/webapp/WEB-INF和包装项目与sbt project。根据previous SO quesiton，这应该是我需要的。不过，我得到这个：App Engine没有在WAR中找到WAR中创建的WEB-INF
$ dev_appserver.sh target/scala_2.8.1/
2011-02-06 13:37:45.763 java[20355:903] [Java CocoaComponent compatibility mode]: Enabled
2011-02-06 13:37:45.765 java[20355:903] [Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000
Feb 6, 2011 12:37:47 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
com.google.apphosting.utils.config.AppEngineConfigException: Supplied application has to contain WEB-INF directory.
at com.google.appengine.tools.development.JettyContainerService.determineAppRoot(JettyContainerService.java:319)
at com.google.appengine.tools.development.JettyContainerService.initContext(JettyContainerService.java:145)
at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:146)
at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219)
at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:164)
at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)
at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)
任何想法为什么？谢谢。