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
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