GWT App引擎错误

Question

我的GWT应用程序出现小问题。

这里是控制台输出：

SEVERE: Received exception processing /Users/je/Documents/HelloWorld/ConnectrStage1/war/WEB-INF/appengine-web.xml 
com.google.apphosting.utils.config.AppEngineConfigException: appengine-web.xml does not contain a <threadsafe> element. 
See http://code.google.com/appengine/docs/java/config/appconfig.html#Using_Concurrent_Requests for more information. 
You probably want to enable concurrent requests. 
    at com.google.apphosting.utils.config.AppEngineWebXmlReader.readAppEngineWebXml(AppEngineWebXmlReader.java:79) 
    at com.google.appengine.tools.development.AbstractContainerService.loadAppEngineWebXml(AbstractContainerService.java:360) 
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:239) 
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:148) 
    at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:97) 
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509) 
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1093) 
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:836) 
    at com.google.gwt.dev.DevMode.main(DevMode.java:311) 
    [ERROR] Unable to start App Engine server 
com.google.apphosting.utils.config.AppEngineConfigException: appengine-web.xml does not contain a <threadsafe> element. 
See http://code.google.com/appengine/docs/java/config/appconfig.html#Using_Concurrent_Requests for more information. 
You probably want to enable concurrent requests. 
    at com.google.apphosting.utils.config.AppEngineWebXmlReader.readAppEngineWebXml(AppEngineWebXmlReader.java:79) 
    at com.google.appengine.tools.development.AbstractContainerService.loadAppEngineWebXml(AbstractContainerService.java:360) 
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:239) 
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:148) 
    at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:97) 
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509) 
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1093) 
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:836) 
    at com.google.gwt.dev.DevMode.main(DevMode.java:311) 
Unable to start embedded HTTP server 
com.google.gwt.core.ext.UnableToCompleteException: (see previous log entries) 
    at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:102) 
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509) 
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1093) 
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:836) 
    at com.google.gwt.dev.DevMode.main(DevMode.java:311) 
[ERROR] shell failed in doStartupServer method 

Answer 1

对于我来说，这是很清楚的

com.google.apphosting.utils.config.AppEngineConfigException: appengine-web.xml does not contain a <threadsafe> element. 

见https://developers.google.com/appengine/docs/java/config/appconfig?hl=fr#Using_Concurrent_Requestsfor更多信息。