Dear all,
I am having problems with a GWT program (it is not pure GWT but it makes
use of SmartGWT framework) developed using a MVP approach and I need your
support: I have created dedicated classes for each window that I want to
render; every time I want to switch between "pages" I call destroy method
to the "page" that I want to close (i.e. I call destroy method on Layout
object) and I launch a custom event in order to load the new "page". The
problem is that sometimes (I was not able to find a predefined pattern) the
method MyCurrentLoadedLayout.destroy(), called from my current loaded
layout, throws an exception and the program crash.
This is the exception that has been launched:
java.lang.ClassCastException: null
at java.lang.Class.cast(Class.java:2990)
at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:169)
at
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:57)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:299)
at
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
at com.smartgwt.client.widgets.BaseWidget.destroy(BaseWidget.java)
at com.myTestClass.myTestLayout.destroyLytMain(myTestLayout.java:867)
[...]
I am sure that the Layout class is not null because, as I wrote, the major
of the time the code works correctly.
This strange behavior happens, randomly, also when I try to launch an event
via EventBus:
com.google.gwt.event.shared.UmbrellaException: Exception caught: null
at com.google.gwt.event.shared.EventBus.castFireEvent(EventBus.java:69)
at
com.google.gwt.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:57)
at com.myTestClass.myTestLayout$10.onSuccess(myTestLayout.java:842)
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.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
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:172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)
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:242)
at sun.reflect.GeneratedMethodAccessor139.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:172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Thread.java:680)
Please could you help me understanding which is the problem? What can I do
in order to figure out what is the cause?
Thank you vey much for your help and best Regards,
Marco.
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