I just updated my sdk to 1.2.6 and having the same problem as described in above mail. I'm using Eclipse Galileo. The project that I'm working on was working just fine till day before yesterday.
Thanks. Iqbal Yusuf Dipu Unable to start embedded HTTP server java.lang.RuntimeException: Unable to locate the App Engine agent. Please use dev_appserver, KickStart, or set the jvm flag: "- javaagent:<sdk_root>/lib/agent/appengine-agent.jar" at com.google.appengine.tools.development.DevAppServerFactory.testAgentIsInstalled (DevAppServerFactory.java:102) at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer (DevAppServerFactory.java:77) at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer (DevAppServerFactory.java:38) at com.google.appengine.tools.development.gwt.AppEngineLauncher.start (AppEngineLauncher.java:79) at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365) at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589) at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397) at com.google.gwt.dev.HostedMode.main(HostedMode.java:232) Caused by: java.lang.NoClassDefFoundError: com/google/appengine/tools/ development/agent/AppEngineDevAgent at com.google.appengine.tools.development.DevAppServerFactory.testAgentIsInstalled (DevAppServerFactory.java:98) ... 7 more Caused by: java.lang.ClassNotFoundException: com.google.appengine.tools.development.agent.AppEngineDevAgent at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) ... 8 more --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---