javax.ejb.Stateless : Stateless « javax.ejb « Java by API

1. Java by API
2. javax.ejb
3. Stateless

javax.ejb.Stateless

  


File: Employee.java

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

@Entity

public class Employee implements java.io.Serializable {
  private int id;

  private String firstName;

  private String lastName;

  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }


  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getFirstName() {
    return firstName;
  }

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

  public String getLastName() {
    return lastName;
  }

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


File: EmployeeService.java

import javax.ejb.Stateless;
import javax.transaction.TransactionManager;

@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeService() {
  }

  
  @JndiInjected("java:/TransactionManager")
  TransactionManager tm;
  public void doAction() throws Exception {

    System.out.println("Is there a transaction: " + (tm.getTransaction() != null));

  }
}


File: EmployeeServiceLocal.java



import java.util.Collection;

import javax.ejb.Local;

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


}



File: EmployeeServiceRemote.java




import java.util.Collection;

import javax.ejb.Remote;

@Remote
public interface EmployeeServiceRemote{
  public void doAction()  throws Exception;  

}



File: JndiInjected.java


import java.lang.annotation.*;

@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface JndiInjected {
   String value();
}


File: JndiInjector.java


import java.lang.reflect.*;

import javax.ejb.*;
import javax.interceptor.*;
import javax.naming.*;
import javax.annotation.PostConstruct;

public class JndiInjector {

   @PostConstruct
   public void jndiInject(InvocationContext invocation) {
      Object target = invocation.getTarget();
      Field[] fields = target.getClass().getDeclaredFields();
      Method[] methods = target.getClass().getDeclaredMethods();

      // find all @JndiInjected fields methods and set them
      try {
         InitialContext ctx = new InitialContext();
         for (Method method : methods) {
            JndiInjected inject = method.getAnnotation(JndiInjected.class);
            if (inject != null) {
               Object obj = ctx.lookup(inject.value());
               method.setAccessible(true);
               method.invoke(target, obj);
            }
         }
         for (Field field : fields) {
            JndiInjected inject = field.getAnnotation(JndiInjected.class);
            if (inject != null) {
               Object obj = ctx.lookup(inject.value());
               field.setAccessible(true);
               field.set(target, obj);
            }
         }
         invocation.proceed();
      } catch (Exception ex) {
         throw new EJBException("Failed to execute @JndiInjected", ex);
      }
   }
}


File: Main.java

import java.util.Date;

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("EmployeeService/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






   
    
  

EJB-ThrowExceptionOutofEjbMethod.zip( 4,491 k)

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