I'm curious why. "myModule" needs nothing from, and provides nothing to,
the airlinesModule. Why would it also need to be wrapped in a
PrivateModule? The only reason I'm wrapping airlineModule is because I have
a 3rd module I want to add which would have conflicts with airlineModule.
My first step was trying to get airlineModule to work as a PrivateModule
before adding in the complexity of the 3rd module.
On Wednesday, March 23, 2016 at 6:57:11 PM UTC-7, Tavian Barnes wrote:
>
> You have to put both of them in PrivateModules, and export the things you
> need.
>
> On Wednesday, 23 March 2016 13:16:51 UTC-4, Chris Kessel wrote:
>>
>> I must be doing something wrong then. I'm using Dropwizard, which does
>> this behind the scenes:
>> injector =
>> injectorFactory.create(this.stage,ImmutableList.copyOf(this.modules));
>>
>> I'm passing in that list of modules.
>>
>> This works:
>> Arrays.asList(myModule, airlineModule);
>>
>> This fails:
>> Arrays.asList(
>> myModule,
>> new PrivateModule() {
>> protected void configure() {
>> install(airlinesModule);
>> }
>> });
>>
>> It fails with:
>>
>> 1) Unable to create binding for com.kessel.airlines.AirlineCache. It was
>> already configured on one or more child injectors or private modules
>> bound at com.kessel.airlines.AirlineModule.provideAirlineCache() (via
>> modules: com.kessel.MyMain$1 -> com.kessel.airlines.AirlineModule)
>> If it was in a PrivateModule, did you forget to expose the binding?
>>
>> However, the AirlineCache is provided in the AirlineModule. Why is
>> wrapping it in a PrivateModule causing this failure?
>> @Provides
>> @Singleton
>> public AirlineCache provideAirlineCache() {
>> ...
>> }
>>
>> On Tuesday, March 22, 2016 at 4:53:28 PM UTC-7, scl wrote:
>>>
>>> Private modules is the way to go.
>>> A binding in a private module can see all other bindings in the same
>>> private module and all bindings of all non private modules.
>>>
>>>
>>>
>>> On 22.03.2016 21:58, Chris Kessel wrote:
>>>
>>> I'm adding two Guice modules, but they both have an @Provides for the
>>> same item. They're both 3rd party modules, so I can't modify the code. How
>>> do I prevent the collision? I really need each module to use it's own
>>> provided version. I guess the equivalent of each living within it's own
>>> "scope" where it's provided items aren't visible to the other modules.
>>>
>>> Guice.createInjector(Stage.DEVELOPMENT, Arrays.asList(moduleA, moduleB));
>>>
>>> I've tried wrapping them in a PrivateModule, but then they don't seem to
>>> even see their own @Provides...maybe I'm not understanding how to configure
>>> a PrivateModule? I'll actually want expose one specific class from each
>>> module to to my module that I'm developing, but my first step was trying to
>>> get these two other modules to coexist.
>>>
>>> The injector supports creation with multiple modules and it seems like
>>> provider collision would happen now and then, so presumably there's some
>>> way to deal with that I'm not groking...
>>>
>>> Thanks,
>>> Chris
>>>
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