Binding Generic class object in Google guice

Question

I have the following config file..

*.*.HM.Evaluation.Types = { "key1" = "value1"; "key2" = "value2"; "key3" = "value3"; };

I have the following constructor injection...

@Inject public myConstuctor(@NonNull @Named("HM.Evaluation.Types") final Map<String , String> myMap) { ... }

This Works when I run my code using

Properties myProperties = new Properties().load(new FileReader("myConfig.properties")); Names.BindProperties(Binder() , myProperties);

When I test my code using JUnits, I am not able to bind a

Map< String,String> class

The following code

Injector injector = Guice.CreateInjector((AbstractModule) -> { bind(Map.class) .annotatedWith(Names.named("HM.Evaluation.Types")).toInstance(DUMMP_MAP); });

gives me the following a google guice error

no implementation for java.lang.map< string , string> is found for the value Named(value = "HM.Evaluation.Types")

Is there a work around for this?

Olivier Grégoire · Accepted Answer · 2018-04-04 10:36:36Z

You can bind generics

Using a provider method (personal favorite)

class MyModule extends AbstractModule { ... @Provides @Singleton @Named("HM.Evaluation.Types") Map<String,String> provideDummpMap() { return DUMMP_MAP; } }

Alternatively you can use TypeLiteral:

bind(new TypeLiteral<Map<String,String>>(){}) .annotatedWith(Names.named("HM.Evaluation.Types")) .toInstance(DUMMP_MAP);

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