It's a bit verbose, but I read the properies in the module
constructor, save them to member fields, then bind them in the
Module#bind method. Then if the setting doesn't exist, the constructor
throws a ConfigurationException. This has the benefit of making the
configuration options quite explicit and allows you to have another
constructor that just takes all the settings as parameters, useful for
testing.
For example
public class AModule extends AbstractModule {
}
On Mar 24, 8:11 pm, Martin <[email protected]> wrote:
> Hi All,
>
> I'm using Guice 2.0 to inject a class with values from a properties
> file using the @Named annotation with Names.bindProperties() as well
> as static injection using binder.requestStaticInjection() to wire
> Guice.
>
> As an example my static class "Properties" with property keys contains
> inject bindings as follows
>
> private static final String DEFAULT_COMPONENT_VERSION =
> "2.0";
>
> @Inject(optional = true)
> @Named("version")
> public static String PROP_COMPONENT_VERSION =
> DEFAULT_COMPONENT_VERSION;
>
> The problem I am having is with exceptions. If I don't use
> (optional=true) and my property is not defined inside the properties
> file, Guice will throw a CreationException. I've been trying to catch
> this exception around binder.requestStaticInject() without success
> since a exception is throw within the Properties file.
>
> I would like to know how i can accomplish the continuation of the
> program flow and simple notify the user on start-up using log("using "
> +DEFAULT_COMPONENT_VERSION) instead of a CreationException that Guice
> throws which halts everything.
>
> With (optional=true) i never actually know if the Guice bindings fail
> or not. If they do then Guice just ignores and continues.
>
> Thanks,
> Martin
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