I did a tiny code test, and it seems like this is already going to fail at
initial start time (note: not compilation time).
object Test {
import net.codingwell.scalaguice.InjectorExtensions._
class FooService
class MyObject @Inject() (foo: FooService)
class InjectionTest @Inject() (inj: Injector) {
def doTest() = inj.instance[MyObject]
}
def main(args: Array[String]): Unit = {
val injector = Guice.createInjector(new ScalaModule() {
override def configure(): Unit = {
binder().requireExplicitBindings()
bind[MyObject]
bind[InjectionTest].asEagerSingleton()
}
})
injector.instance[InjectionTest].doTest()
}
}
The error is this (rightly so):
Exception in thread "main" com.google.inject.CreationException: Guice
creation errors:
1) Explicit bindings are required and Test$FooService is not explicitly
bound.
while locating Test$FooService
for parameter 0 at Test$MyObject.<init>(Test.scala:22)
at Test$$anon$1.bind(Test.scala:27)
Did you test the behavior already, or were you just curious of the
behavior? It seems to work the way you want it to.
On Thu, Oct 2, 2014 at 12:33 AM, Kevin Burton <[email protected]> wrote:
> I'm curious what the best practice is here.
>
> Let's say that deep in your code you wanted to create a new instance of
> MyObject and pass it a FooService...
>
> One could use an injector to do this.. but what if we actually forgot to
> bind anything to FooService?
>
> You would deploy your application, it would be running just fine for
> months, then all of a sudden you would need FooService and your app would
> fail.
>
> How does one avoid that scenario?
>
> If you used explicitly provided dependencies, your app would fail at
> compilation time.
>
> Now we've postponed to fail at run time.. which is not fun.
>
> Any solutions here?
>
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