One more thing I forgot to mention. You have to add an init-param to
the requestFactoryServlet to identify your implementation class for
the user information class. (This is in your web.xml). Mine looks
like this.
<servlet>
<servlet-name>requestFactoryServlet</servlet-name>
<servlet-
class>com.google.gwt.requestfactory.server.RequestFactoryServlet</
servlet-class>
<init-param>
<param-name>userInfoClass</param-name>
<param-value>com.eatrightapp.server.domain.GaeUserInformation</
param-value>
</init-param>
</servlet>
Without that specified, your login widget will always show the user as
"Dummy User" and the logout link will not be functional. Now that all
this is in place, mine is completely working as expected.
Thanks,
Nick
On Nov 18, 6:18 pm, Nicholas <[email protected]> wrote:
> Richard, I was missing that initialization to requestFactory as well.
> I had to add that, and I had to add the following sections to my
> web.xml:
>
> <servlet>
> <servlet-name>requestFactoryServlet</servlet-name>
> <servlet-
> class>com.google.gwt.requestfactory.server.RequestFactoryServlet</
> servlet-class>
> </servlet>
>
> <servlet>
> <servlet-name>remoteapi</servlet-name>
> <servlet-
> class>com.google.apphosting.utils.remoteapi.RemoteApiServlet</servlet-
> class>
> </servlet>
>
> <servlet-mapping>
> <servlet-name>remoteapi</servlet-name>
> <url-pattern>/remote_api</url-pattern>
> </servlet-mapping>
>
> <servlet-mapping>
> <servlet-name>requestFactoryServlet</servlet-name>
> <url-pattern>/gwtRequest</url-pattern>
> </servlet-mapping>
>
> In addition, I added the appengine-tools-api.jar files to my web-inf/
> lib folder.
>
> I had to add the following to my apps gwt.xml file:
>
> <inherits name='com.google.gwt.json.JSON'/>
>
> Finally, I added json.jar to my web-inf/lib folder. I'm not sure
> where this file originated, but I finally tracked down a copy
> at:http://google-web-toolkit.googlecode.com/svn-history/r7687/trunk/bike...
>
> Now the app seems to be running without any errors. I think some of
> this needs to go into the RequestBuilder/MVP documentation. If it's
> there I completely overlooked it.
>
> Nick
>
> On Nov 18, 2:05 pm, Richard Berger <[email protected]> wrote:
>
>
>
>
>
>
>
> > As is typical - after working on this for hours, I think I found my
> > problem 10 minutes after posting. Since I am trying to avoid MVP (for
> > now, until the brain cell count improves), I had not initialized my
> > RequestFactory. Adding:
> > final EventBus eventBus = new SimpleEventBus();
> > requestFactory.initialize(eventBus);
> > has moved me past my NPE. Into other errors of course...
>
> > Thanks for listening....
>
> > RB
>
> > On Nov 18, 11:50 am, Richard Berger <[email protected]> wrote:
>
> > > I am having a very similar problem - NullPointerException when I call
> > > fire() (the NPE is in AbstractRequestContext.doFire()). So I am
> > > wondering if you have found a solution to your problem.
>
> > > The code with the fire() is:
> > > CommitmentSystemRequestFactory requestFactory =
> > > GWT.create(CommitmentSystemRequestFactory.class);
> > > requestFactory.commitmentRequest().countCommitments().fire(
> > > new Receiver<Long>() {
> > > @Override
> > > public void onSuccess(Long response) {
> > > Window.alert("Done!");
> > > }
> > > });
>
> > > My CommitmentRequest class has:
> > > @Service (Commitment.class)
> > > public interface CommitmentRequest extends RequestContext {
> > > Request<Long> countCommitments();
>
> > > My Commitment.java class has:
> > > public static long countCommitments() {
> > > ....
> > > }
>
> > > Some other notes...
> > > * I have also been going through the Expenses sample app, both the
> > > description
> > > at:http://code.google.com/webtoolkit/doc/latest/DevGuideRequestFactory.h...
> > > and the sample code.
> > > * I am NOT using JPA. My first learning project for GWT/GAE was with
> > > JPA, but now I wanted to try the RequestFactory and then add
> > > Objectify.
> > > * I am NOT using MVP. I just don't yet have the critical mass of
> > > brain cells necessary.
>
> > > Thanks for any updates or advice...
> > > RB
>
> > > On Nov 18, 9:05 am, Nicholas <[email protected]> wrote:
>
> > > > Thanks, you got me on the right rack. I didn't realize that more
> > > > information on the exceptions was available in the dev mode console of
> > > > eclipse. My domain entity objects had some Boolean accessors which I
> > > > had named isProperty() instead of getProperty(). I changed all of
> > > > those, and also made the domain service methods 'static' like you
> > > > suggested.
>
> > > > Now the application is running, but when it fires a request for
> > > > UserInformation, I get a null pointer exception. After debugging, it
> > > > gets into AbstractRequestContext.doFire(receiver) method, which
> > > > attempts to call requestFactory.getRequestTransport().send(...).
> > > > requestFactory.getRequestTransport() returns NULL so it throws a Null
> > > > Pointer Exception. Do I need to configure the transport somewhere? I
> > > > didn't see anything in the documentation or the Expenses sample app.
>
> > > > The portion of my code that is initiating this is (~ line 60)
> > > > in:http://code.google.com/p/eatright/source/browse/trunk/EatRightApp/src...
>
> > > > On Nov 17, 6:28 pm, Thomas Broyer <[email protected]> wrote:
>
> > > > > On 17 nov, 21:06, Nicholas <[email protected]> wrote:
>
> > > > > > I am working on a small GWT app (I have used GWT in the past but it
> > > > > > was a while ago), trying to learn the new MVP and RequestFactory. I
> > > > > > am not sure if I am just approaching this wrong, or have some error
> > > > > > I
> > > > > > can't spot. When I add a call to instantiate my app's
> > > > > > RequestFactory,
> > > > > > it no longer runs. It gives me "Deferred Binding Failed" for my
> > > > > > request factory.
>
> > > > > > I went back and double-checked the domain / entity objects and I
> > > > > > think
> > > > > > I have the required pattern in place (implicit no-arg constructor,
> > > > > > getId(), findEntity(id) and getVersion()).
>
> > > > > > Some of the relevant code:
>
> > > > > > Domain
> > > > > > objects:http://code.google.com/p/eatright/source/browse/#svn/trunk/EatRightAp...
>
> > > > > > EntityRequest and Proxy
> > > > > > objects:http://code.google.com/p/eatright/source/browse/#svn/trunk/EatRightAp...
>
> > > > > > This class instantiates the RequestFactory (line 35) and passes it
> > > > > > to
> > > > > > the Activity (line
> > > > > > 41)http://code.google.com/p/eatright/source/browse/trunk/EatRightApp/src...
>
> > > > > > This class is where I have a method utilizing the request factory.
> > > > > > (~
> > > > > > line
> > > > > > 49)http://code.google.com/p/eatright/source/browse/trunk/EatRightApp/src...
>
> > > > > >http://code.google.com/p/eatright/source/browse/trunk/EatRightApp/src...
>
> > > > > > Any ideas?
>
> > > > > Your "service methods" in your domain objects aren't static, but
> > > > > aren't declared as InstanceRequest in your RequestContext.
> > > > > (don't you have more specific errors than "deferred binding failed"?)
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