Get-And-Use-Invocation-Context


            File: EmployeeBean.java
 
import javax.ejb.Stateless;
import javax.interceptor.Interceptors;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService") private EntityManager manager;
  
  @Interceptors(Profiler.class)
  public void doAction(){
    Customer cust = new Customer();
    cust.setLastName("Bond");
    cust.setSsn(1L);
    manager.persist(cust);
    
    System.out.println("Saved");
    
    cust = manager.find(Customer.class,1L);
    System.out.println(cust.getLastName());
    
    cust.setLastName("new name");
    
    manager.persist(cust);
    
    cust = manager.find(Customer.class,1L);
    System.out.println(cust.getLastName());
    
    manager.remove(cust);
    
  }
} 
File: EmployeeServiceLocal.java
 
import javax.ejb.Local;
import javax.jws.WebParam;
@Local
public interface EmployeeServiceLocal {
  public void doAction();
} 
File: EmployeeServiceRemote.java
 
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
  public void doAction();
} 
File: Profiler.java
 
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
public class Profiler {
  @AroundInvoke
  public Object profile(InvocationContext invocation) throws Exception 
  {
     long startTime = System.currentTimeMillis();
     try 
     {
        return invocation.proceed();
     } 
     finally 
     {
        long endTime = System.currentTimeMillis() - startTime;
        System.out.println("Method " + invocation.getMethod()
                           + " took " + endTime + " (ms)");
     }
  }
} 
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
EJB3 Java Tutorial
