Objectify上下文未开始/ ObjectifyFilter缺失

App Engine(突然间)告诉我,我的Objectify设置不正确.据工作之前,我做在我的web.xml中的客体筛选.

这是我日志中的完整堆栈跟踪:

javax.servlet.ServletContext log: unavailable
java.lang.IllegalStateException: You have not started an Objectify context.
                                 You are probably missing the ObjectifyFilter.
                                 If you are not running in the context of an http request, see the ObjectifyService.run() method.
    at com.googlecode.objectify.ObjectifyService.ofy(ObjectifyService.java:44)
    at com.mydomain.gae.defaultmodule.MyObject.loadEverything(MyObject.java:21)
    at com.mydomain.gae.defaultmodule.MyServlet.init(MyServlet.java:40)
    at javax.servlet.GenericServlet.init(GenericServlet.java:212)
    at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:206)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:179)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:136)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:469)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:437)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:444)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:256)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:308)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:300)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:441)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)
    at java.lang.Thread.run(Thread.java:745)

这是我的web.xml:

    
        
            com.mydomain.gae.defaultmodule.Initializer
        
    

    
        MyServlet
        com.mydomain.gae.defaultmodule.MyServlet
        1
    
    
        MyServlet
        /*
    

    
        ObjectifyFilter
        com.googlecode.objectify.ObjectifyFilter
    
    
        ObjectifyFilter
        /*
    

......然后这是代码:

public class Initializer implements ServletContextListener {

    @Override
    public void contextInitialized(@Nonnull final ServletContextEvent SCE) {
        ObjectifyFactory oFactory = ObjectifyService.factory();
        oFactory.register(MyEntity.class);
        oFactory.register(MyOtherEntity.class);
        oFactory.begin();
    }
}

public final class MyServlet extends HttpServlet {

    private MyObject = myObj;

    @Override
    public void init() throws ServletException {
        myObj = new MyObject();
        myObj.loadEverything();
    }
}

public class MyObject extends MyOtherObject {

    public void loadEverything() {
        for (MyEntity me : ofy().load().type(MyEntity.class).list()) {
            // Do very important things.
        }
    }
}

该IllegalStateException是尽快,因为它得到抛出ofy().load().type(MyEntity.class).list().此代码以前有效.我不知道为什么这个突然爆炸了,因为这里所分享的代码都没有在爆炸之前被改变.

如果有人有任何想法可能让我朝着正确的方向前进,我对听到他们100%感兴趣.

过滤器适用于请求.您的servlet init方法未在请求的上下文中调用,因此ObjectifyFilter未运行 - 请注意它不在您的堆栈跟踪中.

摆脱oFactory.begin()你的contextInitialized(),这不是正确使用那种方法.

如果要在servlet中使用Objectify init(),请在ObjectifyService.run()以下位置运行代码:

ObjectifyService.run(new VoidWork() {
    public void vrun() {
        myObj = new MyObject();
        myObj.loadEverything();
    }
});

这将以与过滤器相同的方式设置和拆除Objectify上下文.