how the servlet will integrate the LDAP code

[j.gohel]

Hello all,
I have a code that adds the entries to the LDAP directory server and this code is in JAVA
But this code does compile but when i run it it gives Runtime error as
::::: Invalid credentials::::::

The server is running when the code is run. for this do i need to specify certain schema in the .CONF file or anything else
How to integate this code into the servlet????

The server I am using is OpenLDAP for Windows and Netscape directory SDK for JAVA

plz tell me about some another server available for LDAP support(free version) with JAVA (For Windows)
Plz tell me about the server and other information about LDAP Directory server so that i could find support for it easily

The code is as below::::::::::::::::::

import netscape.ldap.*;
import java.util.*;

public class Add {
    public static void main( String[] args )
	{
		/* Specify the DN we're adding */
		//String nickname = rock.nickname;
		String dn = "uid=ac" ;

		/* Specify the attributes of the entry */
		String objectclass_values[] = { "top",
										"person",
										"organizationalPerson",
										"inetOrgPerson" };
		

		LDAPAttributeSet attrs = new LDAPAttributeSet();
		LDAPAttribute attr = new LDAPAttribute( "objectclass" );
		for( int i = 0; i < objectclass_values.length; i++ ) {
			attr.addValue( objectclass_values[i] );
		}
		attrs.add( attr );

		
		attrs.add( new LDAPAttribute( "uid", "wbjensen" ) );

		/* Create an entry with this DN and these attributes */
		LDAPEntry myEntry = new LDAPEntry( dn, attrs );

		LDAPConnection ld = null;
		int status = -1;
		try {
			ld = new LDAPConnection();
			/* Connect to server */
			String MY_HOST = "localhost";
			int MY_PORT = 389;
			ld.connect( MY_HOST, MY_PORT );

			/* Authenticate to the server as directory manager */
			String MGR_DN = "dc=monarch,dc=com";
			String MGR_PW = "ali";
			ld.authenticate( MGR_DN, MGR_PW );
			System.out.println("Entry established");

			/* Now add the entry to the directory */
			ld.add( myEntry );
			System.out.println( "Entry added"  );
			System.out.println("Entry established1111");
		}
		catch( LDAPException e ) {
			if ( e.getLDAPResultCode() == LDAPException.ENTRY_ALREADY_EXISTS )
				System.out.println( "Error: Entry already present" );
			else
				System.out.println( "Error: " + e.toString()+"AA che error" );
		}

		/* Done, so disconnect */
		if ( (ld != null) && ld.isConnected() ) {
			try {
			    ld.disconnect();
			} catch ( LDAPException e ) {
				System.out.println( "Error: " + e.toString() );
			}
		}
		System.exit(status);
    }
}

Regards
Jignesh

[Belisarius]

Wow, I didn't think anyone other than legacy maintainers used the Netscape LDAP packages, I'm not even sure if they're still maintained . . . I think there was a bug in the last version I used. If it's possible, you really should switch over to JNDI, as it's part of the Java SDK, so it's more widely used and will probably be supported as long as Java is used.

As for another LDAP server, you might be able to find trial versions, but for an absolutely free version OpenLDAP is pretty much it.

Now, I don't think you're actually connecting as a user, although I'm a bit rusty so I could be wrong. Is "dc=monarch,dc=com" the actual DN of a user in the directory? Further, does this user have the permissions to perform the operations you have requested? The error message pretty clearly indicated that you've failed to authenticate, so you need to concentrate on that.

Man, it's been a while since I worked with LDAP. I love that protocol . . .

[j.gohel]

Hello
Thanks for the reply
Now i have dc=monarch,dc=com as the authId so it could perform all the operations and moreover i wanted to ask that if i wanted to add the entry the DN should have the BaseDN as the suffix is it so??

And if u know how to add the entries using jndi then plz let me know

Thanks
Regards
Jignesh

[Belisarius]

Sun has a tutorial on using JDNI. Here is another tutorial you can look through, as it might be a little easier to follow.

Basically, I don't think you're connecting as a priviledged user. "dc=monarch,dc=com" is the suffix of the directory, or the top, but it's not a root DN. You need to create a root DN underneath this suffix in OpenLDAP and make sure it has administrative privledges.

[j.gohel]

Hello
thanks for your reply. I had modified the authid and now i can authenticate witht the ldap server but there is an Operation error

That occurs while the entries are added to the directory
What must be the cause looking at the code i had written

anything else or schema needs to be changed to add the entries

Plz reply
Regards

Jignesh

[j.gohel]

Hello

I am able to connect to the ldap server by calling the Add.java class into any .java class and it connects successfully but the entry is not added
The code for the Add.java is being checked standalone also only it does not run with the servlet.

But when i call the same code within the servlet it does not show the result
The log file within the container od the servlet shows

LDAPException not found in doPost() method

Here is my servlet code

package com.chat.java;

import netscape.ldap.*;
import netscape.ldap.util.*;
import netscape.ldap.controls.*;
import java.io.*;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import javax.swing.*;
import netscape.ldap.LDAPConnection;

import com.chat.ChatRoomList;
import com.chat.ChatRoom;
import com.chat.Add;



public class LoginServlet extends HttpServlet
{	LDAPConnection ld ;
	boolean flag = false;
	String s1,s2;
	int i = 1800;


    public void doGet(HttpServletRequest req, HttpServletResponse res)
	        throws ServletException, IOException
	 {
		 doPost(req,res);
	 }
    public void doPost(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
        throws ServletException, IOException
    {

        String s = "jdbc:odbc:chat";
        contextPath = httpservletrequest.getContextPath();

        s1 = httpservletrequest.getParameter("nickname");
        s2 = httpservletrequest.getParameter("pwd");


        s1 = s1.trim().toLowerCase();

        if(s2.length() > 0)
            s2 = s2.trim().toLowerCase();

        try
        {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            Connection connection = DriverManager.getConnection(s);
            Statement statement = connection.createStatement();
            for(ResultSet resultset = statement.executeQuery("select * from Login"); resultset.next();)
            {

                String s3 = resultset.getString(1);
                String s4 = resultset.getString(2);

               if(s1.equals(s3) && s2.equals(s4))
                {
                    flag = true;
             	}

			}
		  }//try ends here

		 catch(SQLException sqlexception)
		 {
		     System.out.println("Error...." + sqlexception);
		 }
		 catch(ClassNotFoundException classnotfoundexception)
		 {
		     System.out.println("Error...." + classnotfoundexception);
         }

          if(flag=true)
		  {
				try
			    {



			  	     ChatRoomList chatroomlist = (ChatRoomList)getServletContext().getAttribute("chatroomlist");

			         boolean flag1 = chatroomlist.chatterExists(s1);

                 // THIS IS THE PLACE WHICH DOES NOT HAPPEN
                // THE OBJECT IS NOT CREATED 
                // EXECUTION AFTER IT STOPS 
           
			        Add add = new Add();
			        System.out.println("After add");


			 	     if(flag1)
			   	     {
			   	            JOptionPane.showMessageDialog(null,"U have already Login......","Information",JOptionPane.INFORMATION_MESSAGE);
			   	     }
			   	     else
			   	     {

			   	          	HttpSession httpsession = httpservletrequest.getSession(true);

    	    	          	int i = 1800;

    	    	          	String s2 = getServletContext().getInitParameter("sessionTimeout");

							if(s2 != null)
    	    	          	   try
    	    	                {
    	    	                    i = Integer.parseInt(s2);
    	    	                    i *= 60;
    	    	                }
    	    	                catch(NumberFormatException numberformatexception)
    	    	                { }

    	    				httpsession.setMaxInactiveInterval(i);

    	            		httpsession.setAttribute("nickname", s1);

					}

			   }//try ends
					catch(Exception exception)
					 	{
					      	    System.out.println("Exception thrown in LoginServlet: " + exception.getMessage());
					       	    exception.printStackTrace();
					   	}
				}//if ends here
				else
				{
					JOptionPane.showMessageDialog(null,"Server is saying that Invalid User","Information",JOptionPane.INFORMATION_MESSAGE);
				}

    }//do post ends here

    private final void _mththis()
    {
        contextPath = "";
    }

    public LoginServlet()
    {
        _mththis();
    }

    private String contextPath;
    ObjectOutputStream out=null;

}

Please help

Regards
Jignesh

[Belisarius]

The problem, I think, is still authentication. With LDAP, authentication and connection are really two different steps. When you connect to LDAP, and pass it a set of credentials, you could fail and be allowed in as an anonymous user. I can't remember if the Netscape LDAP packages threw an exception for a failed login or not. But, because you're not authenticated as a user with sufficent rights to actually modify anything, when you try to add an entry it will fail.

As for the Servlet, the problem obviously lies in Add(). We'd best debug that first before you add layers on top of it.

[j.gohel]

Hello
thanks for the reply. I have tested the code and the Add.java works quite fine it is when it enters the servlet the problem starts.
/But if u know about the jndi concept then please let me know

Thanks
Regards
Jignesh

[Belisarius]

but the entry is not added

I was under the impression that you wanted it to add, so there was still a problem.

Anyways, you never declared a constructor for Add, that might be a problem as well.

As for JNDI, see the links I provided earlier.

[j.gohel]

Hello
I have ran the whole code to add the entries standalone and the entries are added

But when i did it using servlet the servlet does not execute any line of the code even no print statement I could see on the console of the web server
I suppose the whole code is being bypassed coz theres no error in the log file

Plz help
Jignesh

[Belisarius]

Well, if you're using the Add that you posted up at the top, it won't do anything because you never defined a constructor.

[j.gohel]

Hello
I have made the necessary changes that u had told me but the servlet is not being able to retrieve the LDAP classes or I could say it is not able to recognize the package

import netscape.ldap.*;

this is not found by the servlet

So do I need to place it in the container all the classes that this package includes

Please reply

Regards
Jignesh

[Belisarius]

Yes, the container won't be using your classpath, so you need to put the Netscape LDAP packages in WEB-INF/classes if they're just .class files, or WEB-INF/lib if they're jars.

[j.gohel]

Hello
thanks for the reply. actually the jars are being placed in the lib itself then also the servlet is unable to find the package netscape.ldap.* and not a single class of the LDAP add functionality is able to create an object

What might be the case now

Thanks
Regards
Jignesh

[Belisarius]

What do you mean by "the lib itself"?