Hello,
I'm using Guice 4.0 beta 2. I have some experience with Guice 3.0 on a
previous project, but no experience with custom scopes.
In my new application I have a Provider for an ApplicationConfigurationobject.
The
Provider selects an ApplicationConfiguration object from the servlet
context, based on information in the HttpServletRequest which is injected
into the Provider.
The binding looks like this:
bind(ApplicationConfiguration.class).toProvider(ApplicationConfigurationProvider.class).in(RequestScoped.class);
So far so good. The Provider correctly provides the
ApplicationConfiguration for each request.
Note that the ApplicationConfiguration is injected into other Providerobjects.
Now, I need to do some processing outside of a servlet request that still
depends on the ApplicationConfiguration object. Specifically, I need to do
some processing that is started from a servlet context listener. The
processing occurs after Guice has been initialized. I have access to the
correct ApplicationConfiguration instance and don't need the Provider to
provide one.
I created a custom scope following the instructions on the "Custom Scopes"
wiki page, and registered the scope and its annotation with Guice.
Since I already have the correct ApplicationConfiguration instance and
don't need a Provider to provide one, I seed the scope with the
ApplicationConfiguration instance. I then try to do something with the
Injector:
SimpleScope scope = ....;
scope.enter();
try
{
scope.seed(Key.get(ApplicationConfiguration.class), appConfig);
//ask the injector for an instance of something....
}
finally
{
scope.exit();
}
It's failing when I ask the injector for something that depends on an
ApplicationConfiguration. Here's part of the error:
1) Error in custom provider, com.google.inject.OutOfScopeException: Cannot
access scoped object. Either we are not currently inside an HTTP Servlet
request, or you may have forgotten to apply
com.google.inject.servlet.GuiceFilter as a servlet filter for this request.
Now, I think it might be failing on another Provider that is also request
scoped, and this Provider has an ApplicationConfiguration injected into it,
but I'm not sure:
bind(EntityManager.class).toProvider(EntityManagerProvider.class).in(RequestScoped.class);
(The EntityManager is picked based on the ApplicationConfiguration)
So, I thought I could scope another Provider that is not in request scope,
but Guice wouldn't let me do that.
Does anybody have any thoughts on what is going wrong? Do I need more or
additional bindings? Am I not seeding the custom scope correctly?
Thank you!!!
-Ryan
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