Java – Glassfish 4, simple example in CDI fails with WELD-001408 Unsatisfied dependencies

cdidependency-injectionglassfishjakarta-eejava

I am a very newbie in CDI. This is my FIRST example and I am trying to run it. Having searched the internet I wrote the following code:
Class that I want to be injected

public class Temp {

public Temp(){

}

public String getMe(){
    return "something";
}
}

Servlet

@WebServlet(name = "NewServlet", urlPatterns = {"/NewServlet"})
public class NewServlet extends HttpServlet {

@Inject
public Temp temp;

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    try (PrintWriter out = response.getWriter()) {
        out.println("<body>");
        out.println("<h1> Here it is"+temp.getMe()+ "</h1>");
        out.println("</body>");
    }
}
...

But I have to following error in glassfish 4:

org.jboss.weld.exceptions.DeploymentException: WELD-001408 Unsatisfied
dependencies for type [Temp] with qualifiers [@Default] at injection
point [[BackedAnnotatedField] @Inject private
xxx.example.NewServlet.temp]

What am I doing wrong?

Best Answer

Either no beans.xml exists within WEB-INF or the file requires changing bean-discovery-mode="annotated" to bean-discovery-mode="all".

<?xml version="1.0" encoding="UTF-8"?>
<beans
  xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
                  http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"
  bean-discovery-mode="all">
</beans>

Explanation

The recommended value "annotated" only recognizes annotated CDI managed beans. Beans without any annotation are ignored. As your Temp class is not CDI bean, so recommendation is not applicable in your case.

Using bean-discovery-mode="annotated"

To work with annotated, annotate the class with @RequestScoped:

// Import only this RequestScoped
import javax.enterprise.context.RequestScoped;

@RequestScoped
public class Temp {

    public Temp() { }

    public String getMe() {
        return "something";
    }
}

This RequestScoped will convert your Temp class to CDI bean and will be work with bean-discovery-mode="annotated".

Related Solutions

WELD-001408 Unsatisfied dependencies when injecting EntityManager

I just had the same problem, I fixed this by adding this class to my project

import java.util.logging.Logger;

import javax.enterprise.context.RequestScoped;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.faces.context.FacesContext;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

/**
 * This class uses CDI to alias Java EE resources, such as the persistence context, to CDI beans
 * 
 * <p>
 * Example injection on a managed bean field:
 * </p>
 * 
 * <pre>
 * &#064;Inject
 * private EntityManager em;
 * </pre>
 */
public class Resources {
   // use @SuppressWarnings to tell IDE to ignore warnings about field not being referenced directly
   @SuppressWarnings("unused")
   @Produces
   @PersistenceContext
   private EntityManager em;

  // @Produces
  // public Logger produceLog(InjectionPoint injectionPoint) {
   //   return Logger.getLogger(injectionPoint.getMember().getDeclaringClass().getName());
  // }

   @Produces
   @RequestScoped
   public FacesContext produceFacesContext() {
      return FacesContext.getCurrentInstance();
   }

}

Java – WELD-001408 Unsatisfied dependencies for type … with qualifiers [@Default] at injection point

How do you inject your bean? Like that?

@Inject
private FWHandlerSqrMind handler;

If so could you try to inject it like that:

@Inject
private FWInterface handler;