Guice 3 in Struts2

Question

I'm trying to integrate Guice 3 into my Struts application. This is what I did : Interface:

public interface PersonDAO{
    void addPerson(String username);
}

Implementation:

@Singleton
public Class PersonDAOImpl implements PersonDAO{
    void addPerson(String username){
        // Implementation
    }
}

I created the Guice module :

public class ServiceInjector extends AbstractModule {    
    @Override
    protected void configure() {
      bind(PersonDAO.class).to(PersonDAOImpl.class);
    }
}

Then I use it like this in my Action:

@Inject
private PersonDAO personDAO;

The problem is that personDAO is always null.

Question : how can I properly integrate Guice to my application ?

Regards.

Answer 1

Never tried, but:

1. include in your project a Struts2 plugin written to interact with Guice (the Guice-Struts2 plugin);
   for example, with Guice 4 and Maven, in your pom.xml it would be:

   <dependency>
       <groupId>com.google.inject.extensions</groupId>
       <artifactId>guice-struts2</artifactId>
       <version>4.1.0</version>
   </dependency>
   

2. Then, in your struts.xml, specify that the ObjectFactory is guice:

   <constant name="struts.objectFactory" value="guice" />
   

It should be enough.