Use Context To Lookup Another Ejb


File: AnotherBean.java

import javax.ejb.Stateless;

@Stateless
public class AnotherBean implements AnotherBeanLocal {

  public void doAnother(){
    System.out.println("from another bean");
  }

}


File: AnotherBeanLocal.java


public interface AnotherBeanLocal {

  public void doAnother();

}


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: EmployeeBean.java

import javax.ejb.EJB;
import javax.ejb.EJBException;
import javax.ejb.Stateless;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

@Stateless
@EJB(name = "audit", beanInterface = AnotherBeanLocal.class)
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }

  public void doAction() {
    System.out.println("doAction");
    try {
      Context ctx = new InitialContext();
      AnotherBeanLocal a = (AnotherBeanLocal) ctx.lookup("java:comp/env/audit");
      a.doAnother();
    } catch (NamingException e) {
      throw new EJBException(e);
    }
  }

}


File: EmployeeServiceLocal.java

import java.util.Map;

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: 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


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();

  }

}

EJB-UseContextToLookupAnotherEjb.zip( 4,489 k)

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1.	Initialize javax.naming.InitialContext with System.getProperties
2.	Context Injection
3.	Explicityly Set Context with JNDI

Use Context To Lookup Another Ejb : Context « EJB3 « Java

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