Hi,
I always get the exception: "java.lang.IllegalStateException: This
widget's parent does not implement HasWidgets" while trying to use a
Composite which wraps a PopupPanel.
A simple example:
// The main application window
public class AppWindow extends Composite {
private final PopupPanel panel = new PopupPanel(true);
public AppWindow() {
initWidget(panel);
}
public void show() {
panel.setSize("300px", "300px");
panel.add(new Label("Application Window"));
panel.show();
}
}
// A button to trigger the application window
public class AppButton extends Composite {
private final Button button = new Button("App");
private final AppWindow window;
public AppButton(AppWindow window) {
this.window = window;
button.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
AppButton.this.window.show();
}
});
initWidget(button);
}
}
// Entry
public class Ping implements EntryPoint {
@Override
public void onModuleLoad() {
AppWindow window = new AppWindow();
AppButton button = new AppButton(window);
RootPanel.get().add(button);
}
}
Now click the button I always get the expected exception :) . It's the
same if the trigger is done via an event bus (i.e., the AppButton
fires an event, the AppWindow catchs the event and show it self).
Note that it's ok if AppWindow does NOT extend Composite.
Could someone explain please?
The stack trace:
00:29:42.628 [ERROR] [ping] Uncaught exception escaped
java.lang.IllegalStateException: This widget's parent does not
implement HasWidgets
at
com.google.gwt.user.client.ui.Widget.removeFromParent(Widget.java:127)
at
com.google.gwt.user.client.ui.ComplexPanel.add(ComplexPanel.java:84)
at
com.google.gwt.user.client.ui.AbsolutePanel.add(AbsolutePanel.java:75)
at com.google.gwt.user.client.ui.PopupPanel
$ResizeAnimation.onInstantaneousRun(PopupPanel.java:311)
at com.google.gwt.user.client.ui.PopupPanel
$ResizeAnimation.setState(PopupPanel.java:208)
at
com.google.gwt.user.client.ui.PopupPanel.setState(PopupPanel.java:
1374)
at com.google.gwt.user.client.ui.PopupPanel.show(PopupPanel.java:
969)
at com.oneo.ping.client.test.AppWindow.show(AppWindow.java:18)
at com.oneo.ping.client.test.AppButton$1.onClick(AppButton.java:
17)
at
com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:
54)
at
com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:1)
at com.google.gwt.event.shared.HandlerManager
$HandlerRegistry.fireEvent(HandlerManager.java:65)
at com.google.gwt.event.shared.HandlerManager
$HandlerRegistry.access$1(HandlerManager.java:53)
at
com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:
178)
at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:52)
at
com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:
116)
at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:
100)
at
com.google.gwt.user.client.ui.Composite.onBrowserEvent(Composite.java:
54)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1307)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1263)
at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)
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:
157)
at
com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:
1713)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
165)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
120)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:
507)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:
264)
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:188)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)
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:
157)
at
com.google.gwt.dev.shell.BrowserChannel.reactToMessages(BrowserChannel.java:
1668)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
401)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
222)
at java.lang.Thread.run(Thread.java:619)
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