EJB Field Injection : Injection « EJB3 « Java Tutorial

1. Java Tutorial
2. EJB3
3. Injection

File: AnotherEJBLocal.java

import javax.ejb.Local;

@Local
public interface AnotherEJBLocal {
  public void doAnother();


}

File: EmployeeBean.java

import javax.annotation.Resource;
import javax.ejb.EJB;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

@Stateless

public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName = "EmployeeService")
  private EntityManager manager;


  @EJB AnotherEJBLocal audit ;
  public void doAction() {
    
    audit.doAnother();

  }
}

File: EmployeeServiceLocal.java

import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void doAction();

}

File: EmployeeServiceRemote.java

import javax.ejb.Remote;


@Remote
public interface EmployeeServiceRemote {
  public void doAction();
}

File: AnotherEJB.java

import javax.ejb.Stateless;

@Stateless
public class AnotherEJB implements AnotherEJBLocal {

  public void doAnother(){
    System.out.println("AnotherEJB");

  }

}

File: Customer.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
public class Customer implements java.io.Serializable {
  private String firstName;

  private String lastName;
  @Id
  private long ssn;

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }


  public String getLastName() {
    return lastName;
  }

  public void setLastName(String lastName) {
    this.lastName = lastName;
  }


  public long getSsn() {
    return ssn;
  }

  public void setSsn(long ssn) {
    this.ssn = ssn;
  }

}

File: Main.java

import javax.ejb.EJB;
import javax.naming.InitialContext;



public class Main {

  public static void main(String[] a) throws Exception {

    EmployeeServiceRemote service = null;

    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");

    // service = (HelloService)new
    // InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");


    service.doAction();
    


  }

}

File: jndi.properties

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

27.6.Injection
	27.6.1.	Inject Session Context
	27.6.2.	Inject EJB With EJB Annotation
	27.6.3.	Setter Injection
	27.6.4.	EJB Field Injection