I just discovered that bindings created with a MapBinder cannot be
overridden. Here's an example:
Module module1 = new AbstractModule() {
@Override
protected void configure() {
MapBinder<String, String> mapBinder =
MapBinder.newMapBinder(binder(), String.class,
String.class);
mapBinder.addBinding("foo").toInstance("foo1");
}
};
Module module2 = new AbstractModule() {
@Override
protected void configure() {
MapBinder<String, String> mapBinder =
MapBinder.newMapBinder(binder(), String.class,
String.class);
mapBinder.addBinding("foo").toInstance("foo2");
}
};
Guice.createInjector(Modules.override(module1).with(module2));
Executing the above code yields the following error in Guice 2.0 and
3.0-rc2:
Exception in thread "main" com.google.inject.CreationException: Guice
creation errors:
1) Map injection failed due to duplicated key "foo"
at com.google.inject.multibindings.MapBinder$RealMapBinder
$1.initialize(MapBinder.java:355)
at spielplatz.TestApp$2.configure(TestApp.java:31)
1 error
at
com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:
416)
at
com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:
175)
at
com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:
109)
at com.google.inject.Guice.createInjector(Guice.java:95)
at com.google.inject.Guice.createInjector(Guice.java:72)
at com.google.inject.Guice.createInjector(Guice.java:62)
at spielplatz.TestApp.main(TestApp.java:36)
Is this intended behavior? It looks like a bug to me, or am I missing
something?
Reinhard
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