Java by API/javax.ejb/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