Comment by ljh552:
{{{I am not sure I understand the need for this code:
@Inject Injector injector;
It seems to me that this is field injection to inject the Injector's
dependencies ? I would think the injector would be bootstrapped and
provided as a static reference for the entire application. So only one
instance containing all the configuration is initialized once and
broadcasted by one single static helper. I was also doing some testing and
noticed that when I omitted the @Inject on the RealBillingService??????, my
client code worked just fine when I ran the Junit. I thought that it
wouldn't be able to find the dependencies of the constructor's args but it
looks like that it did. That confuses me. Note that however, I put the
TransactionLog??????, CreditCardProcessor?????? interfaces and their
implementations in the same package and JAR as the RealBillingService??????
client. Could this be why Guice is able to find the proper constructor's
args dependencies without the @Inject ?}}}
Why I cannot, If I don't have the @Inject The system will throw exception
and tell me cannot find the proper constructor.
PS: I tested that only the constructor without the parameters and you
declared obviously in the class will not need the annotation @Inject. This
is the default constructor that GUICE invoke.
PS2: my all the class is in the same package too!
For more information:
http://code.google.com/p/google-guice/wiki/GettingStarted
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