GWT appstats + Gradle 错误

Question

我在一个使用 GWT 和 Google API 引擎的项目中工作。该项目没有依赖管理器，那么我们正在实施 Gradle。

问题是我们在执行过程中遇到了一些错误。基本上和Appstats有关。

这是错误：

FAILED appstats: java.lang.NullPointerException
java.lang.NullPointerException
    at com.google.appengine.labs.repackaged.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:219)
    at com.google.appengine.tools.appstats.Recorder.<init>(Recorder.java:209)
    at com.google.appengine.tools.appstats.Recorder.<init>(Recorder.java:197)
    at com.google.appengine.tools.appstats.AppstatsFilter.init(AppstatsFilter.java:185)
    at org.eclipse.jetty.servlet.FilterHolder.doStart(FilterHolder.java:118)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:763)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:265)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1242)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494)
    at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:541)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
    at org.eclipse.jetty.server.handler.RequestLogHandler.doStart(RequestLogHandler.java:162)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
    at org.eclipse.jetty.server.Server.doStart(Server.java:282)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:740)
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:632)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1054)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:836)
    at com.google.gwt.dev.DevMode.main(DevMode.java:413)
   [WARN] Failed startup of context c.g.g.d.s.j.WebAppContextWithReload{/,file:/home/crosa/work/moto_work/kaiju_gradle/war/},/home/crosa/work/moto_work/kaiju_gradle/war
java.lang.NullPointerException
    at com.google.appengine.labs.repackaged.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:219)
    at com.google.appengine.tools.appstats.Recorder.<init>(Recorder.java:209)
    at com.google.appengine.tools.appstats.Recorder.<init>(Recorder.java:197)
    at com.google.appengine.tools.appstats.AppstatsFilter.init(AppstatsFilter.java:185)
    at org.eclipse.jetty.servlet.FilterHolder.doStart(FilterHolder.java:118)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:763)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:265)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1242)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494)
    at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:541)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
    at org.eclipse.jetty.server.handler.RequestLogHandler.doStart(RequestLogHandler.java:162)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
    at org.eclipse.jetty.server.Server.doStart(Server.java:282)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:740)
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:632)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1054)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:836)
    at com.google.gwt.dev.DevMode.main(DevMode.java:413)
   Resolving com.smartgwt.client.widgets.form.fields.TimeItem
      Found type 'com.smartgwt.client.widgets.form.fields.TimeItem'
         Resolving method setDisplayFormat
            Resolving annotation for java.lang.Deprecated
         Resolving method getDisplayFormat
            Resolving annotation for java.lang.Deprecated
   Started SelectChannelConnector@127.0.0.1:8888

你们中有人以前有过这个错误吗？

Answer 1

com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:740)

该行表示您没有使用 AppEngine“启动器”（开发服务器）。这可能就是 Appstats 不起作用的原因。

Answer 2

您似乎正在使用以下方式启动应用程序：

mvn gwt:run

而不是使用：

mvn appengine:devserver