Using DispatchAsync from Legacy Classes

Erez Lirov

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Jan 10, 2013, 5:06:23 PM1/10/13

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Hi! We would like to slowly migrate to GWTP, server-side first. We're trying to take a legacy GWT client side class and change the server RPC call to use GWTP's DispatchAsync mechanism without actually converting any of our legacy client-side code into Presenter objects.

Is it possible to inject a DispatchAsync object into an existing client side GWT class without converting it to a Presenter?

We're trying this:

public class TestUiPanel {

private final DispatchAsync dispatcher;

@Inject

public TestUiPanel(DispatchAsync dispatcher) {

this.dispatcher = dispatcher;

}

with thisL

@GinModules({ VericleGinModule.class })

public interface VericleGinjector extends Ginjector {

public TestUiPanel getTestUiPanel();

}

But we're getting an error trying to gwt compile the project:

Compiling module com.espoc.vericle.gwt.dispatch.DispatchDev

Computing all possible rebind results for 'com.espoc.vericle.gwt.common.client.VericleGinjector'

Rebinding com.espoc.vericle.gwt.common.client.VericleGinjector

Invoking generator com.google.gwt.inject.rebind.GinjectorGenerator

[ERROR] Error injecting com.gwtplatform.dispatch.shared.DispatchAsync: Unable to create or inherit binding: No @Inject or default constructor found for com.gwtplatform.dispatch.shared.DispatchAsync

Path to required node:

com.espoc.vericle.gwt.dispatch.client.uitest.TestUiPanel [com.espoc.vericle.gwt.common.client.VericleGinjector#getTestUiPanel()]

-> com.gwtplatform.dispatch.shared.DispatchAsync [@Inject constructor of com.espoc.vericle.gwt.dispatch.client.uitest.TestUiPanel]

[ERROR] Errors in 'com/espoc/vericle/gwt/dispatch/client/Dispatch.java'

[ERROR] Line 71: Failed to resolve 'com.espoc.vericle.gwt.common.client.VericleGinjector' via deferred binding

Any ideas?

Christian Goudreau

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Jan 13, 2013, 1:12:06 PM1/13/13

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You need to install the dispatch module first and yes it is possible to use Dispatch without the MVP module.

install(new DispatchAsyncModule());

--

--
Christian Goudreau

www.arcbees.com

Erez Lirov

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Jan 14, 2013, 10:27:48 AM1/14/13

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I added the install here:

VericleGinModule.java:

import com.gwtplatform.dispatch.client.gin.DispatchAsyncModule;

import com.gwtplatform.mvp.client.gin.AbstractPresenterModule;

public class VericleGinModule extends AbstractPresenterModule {

@Override

protected void configure() {

install(new DispatchAsyncModule());

}

Then tied this to the Ginjector here:

VericleGinjector.java:

import com.espoc.vericle.gwt.dispatch.client.uitest.TestUiPanel;

import com.google.gwt.event.shared.EventBus;

import com.google.gwt.inject.client.GinModules;

import com.google.gwt.inject.client.Ginjector;

import com.gwtplatform.mvp.client.proxy.PlaceManager;

@GinModules({ VericleGinModule.class })

public interface VericleGinjector extends Ginjector {

PlaceManager getPlaceManager();

EventBus getEventBus();

TestUiPanel getTestUiPanel();

}

Then, tried to get an instance of TestUiPanel like this:

TestUiPanel.java:

class TestUiPanel {

private final DispatchAsync dispatcher;

@Inject

public TestUiPanel(DispatchAsync dispatcher) {

this.dispatcher = dispatcher;

}

private static final VericleGinjector injector = GWT.create(VericleGinjector.class);

private static final TestUiPanel instance = injector.getTestUiPanel();

}

But I'm getting an Uncaught Exception Escaped that looks like it's caused by a missing FactoryModuleBuilder that seems to want to come from Guice instead of Gin. I didn't Guice could run on the client side. I'm guessing I'm doing something really wrong here...

10:23:14.834 [ERROR] [com.espoc.vericle.gwt.dispatch.Dispatch] Uncaught exception escaped

java.lang.ExceptionInInitializerError: null

at com.espoc.vericle.gwt.dispatch.client.Dispatch.setContent(Dispatch.java:113)

at com.espoc.vericle.gwt.dispatch.client.Dispatch.onModuleLoad2(Dispatch.java:83)

at com.espoc.vericle.gwt.dispatch.client.Dispatch$1.execute(Dispatch.java:74)

at com.google.gwt.core.client.impl.SchedulerImpl$Task$.executeScheduled$(SchedulerImpl.java:50)

at com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:228)

at com.google.gwt.core.client.impl.SchedulerImpl.flushPostEventPumpCommands(SchedulerImpl.java:388)

at com.google.gwt.core.client.impl.SchedulerImpl$Flusher.execute(SchedulerImpl.java:78)

at com.google.gwt.core.client.impl.SchedulerImpl.execute(SchedulerImpl.java:138)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

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: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.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

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: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:722)

Caused by: java.lang.RuntimeException: Deferred binding failed for 'com.espoc.vericle.gwt.common.client.VericleGinjector' (did you forget to inherit a required module?)

at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:53)

at com.google.gwt.core.shared.GWT.create(GWT.java:57)

at com.google.gwt.core.client.GWT.create(GWT.java:85)

at com.espoc.vericle.gwt.dispatch.client.uitest.TestUiPanel.<clinit>(TestUiPanel.java:69)