JAVA NAMING DIRECTORY INTERFACE IN JEE IN THIS POST I WROTE HOW TO INSTALL THE WEBLOGIC SERVER AND IN THAT IMPLEMATION OF JNDI

JNDI

Note: JNDI API can be used to access the Directory servers. The directory servers like weblogic,

Web Sphere, oracle application server, jboss, etc.. Provides several facilities. One of the facility provided by these servers is Directory service.

                All the above servers are developed in java language and supports J2EE technologies like servlet /JSP,EJB,JMS etc.. These servers are also called as J2EE servers.

Procedure for setting up weblogic server:

1.        Choose windows Start àAll  programs à BEA Weblogic platformàConfiguration WizardàClick on next.

àClick on next. --> Click on next.

2.        In this provide the username and password and click on the next button.

3.        Click on next.

4.        Provide configuration-name(Domain name) and click on create button.

Note: When the create button is pressed the directory with the name (domain name) will be created under the c:\bea\user_projects\domains\directory and several files will be copied

5.        Click on done.

Procedure to start weblogic server:

1.        Using the cd command move to the directory created by configuration wizard

2.        run startWeblogic.cmd

Procedure for using weblogic console:

1.        Open the browser

2.        Use the url http://localhost:7001/console

3.        Provide the username and password and click on sign in button

In order to see the content of Weblogic directory service:

1.        Choose domainnameàserverà myserver and right click on myserver to get a popup menu.

2.        Click on view JNDI tree.

A java application using jndi api must get the reference of InitialContext object to deal with the directory server.

Note : Getting the reference of IC is equivalent to establishing the connection with JDBC.

In order to get the reference of the IC a set of properties must be used.

Note: We can get the details of the properties from the manuals

Jndi.properties

java.naming.security.principal=ramu

java.naming.security.credentials=dayinaboyina

java.naming.provider.url=t3://localhost:7001

java.naming.Factory.initial=weblogic.jndi.WLInitialContextFactory

JAPP.javaimport javax.naming.*;

import java.io.*;

import java.util.*;

class JApp

{

                public static void main(String ars[]) throws Exception

                {

                                FileInputStream fis=new FileInputStream("jndi.properties");

                                Properties props=new Properties();

                                props.load(fis);

                                Context ic=new InitialContext(props);

                                System.out.println("..........got Ic......");  

                }

}

àWe can use the above code to deal with directory services of other server like JBOSS, Websphere etc.

è  We can create the subcontexts  the InitialContext object by using the following code.

import javax.naming.*;

import java.io.*;

import java.util.*;

class BatchDemo

{

                public static void main(String ars[]) throws Exception

                {

                                FileInputStream fis=new FileInputStream("jndi.properties");

                                Properties props=new Properties();

                                props.load(fis);

                                Context ic=new InitialContext(props);

                                System.out.println("..........got Ic......");  

                                ic.createSubcontext("mbatch");              

                                ic.createSubcontext("abatch");

                                ic.createSubcontext("mbatch/malestudent");

                                ic.createsubContext("mbatch/femalestudent");

                }

}

è  We can manage  the data by using the directory servers( store, retrieve, remove, modify) i.e directory is similar to the database server but directory does not support SQL commands.

è  destroySubcontext method can be used to remove the subcontext.

Ic.destroySubcontext(“abatch”);

Ic.destorySubcontext(“mbatch/malestudent”);

è  While storing an object under a context in a directory server, we must give a name to the object. Giving the name to the object is called as binding the name to the object.

è  Serializable java objects can be stored in a directory server.

è  By using the bind method serializable java objects can be stored under a context.

Integer o1=new Integer(100);

Float  o2=new Float(200.22f);

Double o3=new Double(300.22);

String o4=new String(“Ramu/crl”);

Ic.bind(“none”,o1);

Ic.bind(“ntwo”,o2);

Ic.bind(“nthree”,o3);

Ic.bind(“nfour”,o4);

è  To remove the bound object we can use unbind()

Ic.unbind(“none”);

Ic.unbind(“ntwo”);

è  Rebind method can be used to replace the existing object with a new object

Integer o1=new Integer(100);

Ic.bind(“xxxx”,o1);

Float o2=new Float(1000.11f);

Ic.rebind(“xxxx”,o2);