Injection of EntityManager or CDI Bean in FacesConverter

Seam3 Persistence Module along with Faces Module  helps in enabling CDI injection in FacesConverter belonging to JSF. Example below.

@FacesConverter(value = "questionTagConverter", forClass = QuestionTag.class)
public class QuestionTagConverter implements Converter{
   
   @Inject
   EntityManager entityManager;
  
    @Override
    public Object getAsObject(FacesContext fc, UIComponent uic, String string) {
        return entityManager.find(QuestionTag.class, Integer.parseInt(string));
    }

    @Override
    public String getAsString(FacesContext fc, UIComponent uic, Object o) {
        return ((QuestionTag)o).getId().toString();
    }
   
}

The Java class which produces the EntityManager is as below.

import javax.enterprise.context.ConversationScoped;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import org.jboss.seam.solder.core.ExtensionManaged;

public class EntityMgrProducer {

    @ExtensionManaged
    @Produces
    @PersistenceUnit(name = "PU_NAMEHERE")
    @ConversationScoped
    EntityManagerFactory entityManager;
}

The related jars should be added to your web application. If you use Maven use the dependencies below.

      <dependency>
            <groupId>org.jboss.seam.faces</groupId>
            <artifactId>seam-faces</artifactId>
            <version>3.0.2.Final</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.seam.persistence</groupId>
            <artifactId>seam-persistence</artifactId>
            <version>3.0.0.Final</version>
        </dependency>

Example Usage - xhtml file

<h:panelGrid columns="2">
                     <p:selectOneMenu value="#{searchMultipleChoiceQuestionAction.questionDataModel.selTag}" converter="questionTagConverter">
                    <f:selectItems value="#{searchMultipleChoiceQuestionAction.tags}" var="qt" itemLabel="#{qt.qtag}" itemValue="#{qt}"/>
                </p:selectOneMenu>
                    <p:commandButton update="searchresult" action="#{searchMultipleChoiceQuestionAction.search()}" value="Search"/>
 </h:panelGrid>