MVP event generation

Hello ,

I am working on a MVP project. I want to generate an event when the
user clicks on the FlexTable cell. So using the MVP pattern i have
created a event class and its corresponding handler interface in the
event package. And the following way i fired the event. I want anyone
of you to tell me is this the correct way of generating events and i
am getting exceptions when i am implementing some "what to do" code on
the successful event generation

The code below shows the event firing when the user clicks on the
cell of the FlexTable

table.addTableListener(new TableListener() {

@Override
public void onCellClicked(SourcesTableEvents sender, int row, int
cell) {

eventBus.fireEvent(new ChartEvent());

}

});

Suppose i want to generate a chart when the user clicks on the
cell ,i would be writing the code for that like this

eventBus.addHandler(ChartEvent.TYPE, new
ChartEventHandler() {

@Override
public void ChartEvent(ChartEvent event) {
Window.alert("event created" );

DialogBox db=new DialogBox();

db.setWidget( (IsWidget) new
ChartGenericPresenter(rpcService,eventBus,new LineView()));

db.show();

}
});

}

Where ChartGenericPresenter is the presenter and LineView() is its
view. I am getting the following exception while i am using this

com.google.gwt.event.shared.UmbrellaException: One or more exceptions
caught, see full set in UmbrellaException#getCauses
at
com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:
129)
at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:124)
at
com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:
116)
at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:
172)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1321)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1277)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:
167)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:
326)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
207)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
132)
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:214)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:
167)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
281)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
531)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
352)
at java.lang.Thread.run(Unknown Source)
Caused by: com.google.gwt.event.shared.UmbrellaException: One or more
exceptions caught, see full set in UmbrellaException#getCauses
at
com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:
129)
at com.dotentreprise.pulsev1.client.view.SystemStatusDisplay
$1.onCellClicked(SystemStatusDisplay.java:96)
at com.google.gwt.user.client.ui.ListenerWrapper
$WrappedTableListener.onClick(ListenerWrapper.java:713)
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.GwtEvent.dispatch(GwtEvent.java:1)
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.HandlerManager.fireEvent(HandlerManager.java:
127)
at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:124)
at
com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:
116)
at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:
172)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1321)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1277)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:
167)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:
326)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
207)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
132)
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:214)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:
167)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
281)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
531)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
352)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException:
com.dotentreprise.pulsev1.client.presenter.ChartGenericPresenter
cannot be cast to com.google.gwt.user.client.ui.IsWidget
at com.dotentreprise.pulsev1.client.AppController
$1.ChartEvent(AppController.java:62)
at
com.dotentreprise.pulsev1.client.event.ChartEvent.dispatch(ChartEvent.java:
22)
at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
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.HandlerManager.fireEvent(HandlerManager.java:
127)
at com.dotentreprise.pulsev1.client.view.SystemStatusDisplay
$1.onCellClicked(SystemStatusDisplay.java:96)
at com.google.gwt.user.client.ui.ListenerWrapper
$WrappedTableListener.onClick(ListenerWrapper.java:713)
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.GwtEvent.dispatch(GwtEvent.java:1)
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.HandlerManager.fireEvent(HandlerManager.java:
127)
at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:124)
at
com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:
116)
at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:
172)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1321)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1277)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:
167)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:
326)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
207)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
132)
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:214)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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:
167)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
281)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
531)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
352)
at java.lang.Thread.run(Unknown Source)

Can anyone tell me why this exception occurring ? or is this the right
method of generating and handling an event in MVP. If not give me a
right solution .

Thanks in advance

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