如何摆脱java.lang.RuntimeException:无法在Eclipse Helios中找到App Engine代理？

Question

   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.DevAppServerMain$StartAction.apply(DevAppServerMain.java:154)
at com.google.appengine.tools.util.Parser$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)
  Caused by: java.lang.NoClassDefFoundError: com/google/appengine/tools/development/agent/AppEngineDevAgent
at com.google.appengine.tools.development.DevAppServerFactory.testAgentIsInstalled(DevAppServerFactory.java:98)
... 6 more
   Caused by: java.lang.ClassNotFoundException:    com.google.appengine.tools.development.agent.AppEngineDevAgent
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 7 more

我在google上搜索,他们要求更改VM Argument.那些答案与我的日食无关.可能是因为那些答案是旧版本的eclipse.任何人都可以帮助我吗？

提前致谢.

Answer 1

转到项目属性> java构建路径>编辑应用引擎sdk并进行配置.在那里添加最新的sdk,问题就解决了.

Answer 2

我碰巧一遍又一遍地遇到这个问题,因为我的项目运行配置一直忘记-javaagent VM参数.在Eclipse中,在菜单栏中选择Run - > Run Configurations ... - > Web Application(blue Google-g) - >选择出现问题的运行配置.选择Tab"Arguments".在"VM参数"文本框中,添加以下条目,将其配置为您的唯一路径和唯一的Eclipse GAE SDK版本:
- javaagent:C:\path-to-your-eclipse\plugins\com.google.appengine.eclipse.sdkbundle_1.6.4.v201203300216r37\appengine-java-sdk-1.6.4\lib\agent\appengine-agent.jar
单击"应用",然后尝试"运行".