Guice assisted inject

Question

I'm new at Guice, so I'm trying to understand AssistedInject. I have very simple project:

Class that I want to Inject:

public class I1 {
}

Class with assisted injection:

public interface ICla {
}

public class Cla implements ICla{
    public Integer t;
    public I1 i;

    @Inject
    public Cla(Integer t, @Assisted I1 i) {
        this.t = t;
        this.i = i;

    }
}

Factory

public interface IClaFactory {
    Cla create(Integer t);
}

And the Main class:

public class Main {
    public static void main(String[] args) {
        Injector injector = Guice.createInjector(new Module());

        IClaFactory factory = injector.getInstance(IClaFactory.class);
    }

    private static class Module extends AbstractModule {
        protected void configure() {
            install(new FactoryModuleBuilder()
                .implement(ICla.class, Cla.class).build(IClaFactory.class));
        }
    }
}

But it still doesn't work and I don't understand, where I'm wrong?

Exception in thread "main" com.google.inject.CreationException: Unable to create injector, see the following errors:

1) No implementation for ru.test.factory.I1 annotated with @com.google.inject.assistedinject.Assisted(value=) was bound.
  while locating ru.test.factory.I1 annotated with @com.google.inject.assistedinject.Assisted(value=)
    for parameter 1 at ru.test.factory.Cla.<init>(Cla.java:11)
  at ru.test.factory.IClaFactory.create(IClaFactory.java:1)
  at com.google.inject.assistedinject.FactoryProvider2.initialize(FactoryProvider2.java:660)
  at com.google.inject.assistedinject.FactoryModuleBuilder$1.configure(FactoryModuleBuilder.java:335) (via modules: ru.test.Main$Module -> com.google.inject.assistedinject.FactoryModuleBuilder$1)

2) Could not find a suitable constructor in java.lang.Integer. Classes must have either one (and only one) constructor annotated with @Inject or a zero-argument constructor that is not private.
  at java.lang.Integer.class(Integer.java:52)
  while locating java.lang.Integer
    for parameter 0 at ru.test.factory.Cla.<init>(Cla.java:11)
  at ru.test.factory.IClaFactory.create(IClaFactory.java:1)
  at com.google.inject.assistedinject.FactoryProvider2.initialize(FactoryProvider2.java:660)
  at com.google.inject.assistedinject.FactoryModuleBuilder$1.configure(FactoryModuleBuilder.java:335) (via modules: ru.test.Main$Module -> com.google.inject.assistedinject.FactoryModuleBuilder$1)

Answer 1

You're @Assisted-ing the wrong parameter: the parameter to "assist" with is the parameter that is defined in the factory interface. In this case, it's your Integer, not your I1.

This will work:

@Inject
public Cla(I1 i, @Assisted Integer t) {
    this.t = t;
    this.i = i;

}