GWT NoSuchElementException with HTMLPanel and addAndReplaceE

Question

这里有一些解释。

如果我的 HTML 页面包含 ：

<div id="cancel_date">
  <h3 id="cancel_date_title"></h3>
  <table align="center">
    <tr>
      <td id="cancel_date_labelDetailService"></td>
      <td id="cancel_date_detailService"></td>
    </tr>
  </table>
</div>

如果我的代码包含

HTMLPanel container = HTMLPanel.wrap(Document.get().getElementById("cancel_date"));
public void init(){
 container.add(getMyWidget(), "cancel_date_detailService");
}
public void reload(){
container.addAndReplaceElement(getService(), "cancel_date_detailService");
}

第一次加载页面时，我使用 init（） 方法初始化它。第二次和之后，我调用方法 reload（）。我第一次调用方法reload（），一切正常。但是之后，我有一个像这样的NoSuchElementException：

ERROR: Uncaught exception escaped
com.google.gwt.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
    at com.google.gwt.event.shared.EventBus.castFireEvent(EventBus.java:69)
    at com.google.gwt.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:57)
    at be.mims.bookme.client.gui.component.MyCellTableFuturDates$7.onSuccess(MyCellTableFuturDates.java:134)
    at be.mims.bookme.client.gui.component.MyCellTableFuturDates$7.onSuccess(MyCellTableFuturDates.java:1)
    at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:232)
    at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
    at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
    at sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.util.NoSuchElementException: cancel_date_detailService
    at com.google.gwt.user.client.ui.HTMLPanel.addAndReplaceElement(HTMLPanel.java:224)
    at be.mims.bookme.client.gui.FactoryCancelDate.showCancelDate(FactoryCancelDate.java:128)
    at be.mims.bookme.client.BookMe.show(BookMe.java:277)
    at be.mims.bookme.client.event.StateEvent.dispatch(StateEvent.java:31)
    at be.mims.bookme.client.event.StateEvent.dispatch(StateEvent.java:1)
    at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
    at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)
    at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
    at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
    at com.google.gwt.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:52)
    at com.google.gwt.event.shared.EventBus.castFireEvent(EventBus.java:67)
    at com.google.gwt.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:57)
    at be.mims.bookme.client.gui.component.MyCellTableFuturDates$7.onSuccess(MyCellTableFuturDates.java:134)
    at be.mims.bookme.client.gui.component.MyCellTableFuturDates$7.onSuccess(MyCellTableFuturDates.java:1)
    at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:232)
    at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
    at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
    at sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Thread.java:722)

如果我进入 SimpleEventBus 类，哪里有例外：

java.util.NoSuchElementException: cancel_date_detailService
at com.google.gwt.user.client.ui.HTMLPanel.addAndReplaceElement(HTMLPanel.java:224)
at be.mims.bookme.client.gui.FactoryDetailRdv.showDetailsDate(FactoryDetailRdv.java:72)
at be.mims.bookme.client.BookMe.show(BookMe.java:228)
at be.mims.bookme.client.event.StateEvent.dispatch(StateEvent.java:31)
at be.mims.bookme.client.event.StateEvent.dispatch(StateEvent.java:1)
at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)
at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
at com.google.gwt.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:52)
at com.google.gwt.event.shared.EventBus.castFireEvent(EventBus.java:67)
at com.google.gwt.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:57)
at be.mims.bookme.client.gui.component.MyCellTableFuturDates$7.onSuccess(MyCellTableFuturDates.java:130)
at be.mims.bookme.client.gui.component.MyCellTableFuturDates$7.onSuccess(MyCellTableFuturDates.java:1)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:232)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.GeneratedMethodAccessor174.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
at sun.reflect.GeneratedMethodAccessor166.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Thread.java:722)

我使用 GWT 2.4.0

非常感谢您的帮助!!

Answer 1

顾

名思义，addAndReplaceElement找到元素并将其替换为给定的小部件。一旦你为一个元素调用了一次addAndReplaceElement，那个元素就消失了，所以第二次调用显然找不到它，导致你看到NoSuchElementException。

如果你想用另一个小部件替换你的小部件，那么你需要把它包装在一个元素中（即调用add而不是addAndReplaceElement），并使用remove删除以前的小部件。

Answer 2

如果不看一下你的getService（）方法，很难说，但我最好的猜测是，在你第一次调用reload（）之后，它正在寻找的元素被替换了。 每隔一段时间，要替换的块不再存在，引发异常。