Java Naming and Directory Interface (JNDI) FAQ From jGuru Generated Sep 13, 2005 1:47:06 PM

Location: http://www.jguru.com/faq/JNDIOwnership: http://www.jguru.com/misc/user-agree.jsp#ownership.

Does JMS require the Java Naming and Directory Interface (JNDI)? Location: http://www.jguru.com/faq/view.jsp?EID=778 Created: Nov 10, 1999 Modified: 1999-11-10 16:23:38.421Author: Jerry Smith (http://www.jguru.com/guru/viewbio.jsp?EID=9)

No, but... JNDI provides network-oriented look-up services for distributed objects (among other things). It's possible to implement, as well as use, JMS software without JNDI. In general, however, JNDI provides critical services for JMS-based software because it's important to be able to locate (programmatically) JMS services implemented in objects called factories.

For example, applications that communicate via JMS must set up communication pathways that involve destinations (topic areas and queues), connections, sessions, and so on. JNDI makes it easy for an application to locate, for example, a connection factory for the appropriate vendor's JMS middleware, which can then provide a connection, which can provide a session, and so on, all relative to the JMS server that's associated with that connection factory.

What is JNDI?Location: http://www.jguru.com/faq/view.jsp?EID=10852 Created: Feb 2, 2000 Modified: 2000-02-02 05:25:14.381Author: Richard Monson-Haefel (http://www.jguru.com/guru/viewbio.jsp?EID=16)

The Java Naming and Directory Interface (JNDI) is an application programming interface (API) for accessing different kinds of naming and directory services. JNDI is not specific to a particular naming or directory service, it can be used to access many different kinds of systems including file systems; distributed objects systems like CORBA, Java RMI, and EJB; and directory services like LDAP, Novell NetWare, and NIS+.

JNDI is similar to JDBC in that they are both Object-Oriented Java APIs that provide a common abstraction for accessing services from different vendors. While JDBC can be used to access a variety of relational databases, JNDI can be used to access a variety of of naming and directory services. Using one API to access many different brands of a service is possible because both JDBC and JNDI subscribe to the same architectural tenet: Define a common abstraction that most vendors can implement. The common abstraction is the API. It provides an objectified view of a service while hiding the details specific to any brand of service. The implementation is provided by the vendor, it plugs into the API and implements code specific to accessing that vendor's product.

JNDI provides two APIs and one SPI. JNDI has a naming API that allows Java applications to access naming systems like CORBA's Naming services and a directory API that extends the naming service to provide access to directory services like LDAP. JNDI also has a SPI (Service-Provider Interface) which is a programming model that vendors use to write JNDI plug-ins or implementations for their specific product. Each

vendor's plug-in is called a service-provider. A service-provider implements the JNDI APIs so that a Java application can access that vendor's product. For the most part, JNDI hides the implementation details of the a service-provider so that Java developer that uses JNDI can use the same objects and method regardless of the brand of naming or directory service accessed. This is the real power behind APIs like JDBC and JNDI: They provide one programming model for accessing many different products; there is no need to learn a different programming model every time a different product is used.

Comments and alternative answers

its good Author: srinivas kumar (http://www.jguru.com/guru/viewbio.jsp?EID=1100681), Jul 10, 2003this page is highly informative and can be easily understood

What mailing lists are available for JNDI discussion? Location: http://www.jguru.com/faq/view.jsp?EID=11934 Created: Feb 6, 2000 Modified: 2000-03-16 23:40:38.213Author: John Zukowski (http://www.jguru.com/guru/viewbio.jsp?EID=7)

Sun manages the JNDI-INTEREST mailing list. A searchable archive of this list can be found at http://archives.java.sun.com/archives/jndi-interest.html. There is also a link on that page which lets you join or leave the mailing list.

Are there any other FAQs on JNDI?Location: http://www.jguru.com/faq/view.jsp?EID=11935 Created: Feb 6, 2000 Modified: 2000-02-07 06:25:06.375Author: John Zukowski (http://www.jguru.com/guru/viewbio.jsp?EID=7)

Sun's JNDI FAQ is available from http://java.sun.com/products/jndi/faq.html.

Are there any books that provide decent JNDI coverage?Location: http://www.jguru.com/faq/view.jsp?EID=12029 Created: Feb 7, 2000 Modified: 2000-05-02 23:54:34.883Author: Richard Monson-Haefel (http://www.jguru.com/guru/viewbio.jsp?EID=16) Question originally posed by John Zukowski PREMIUM (http://www.jguru.com/guru/viewbio.jsp?EID=7

There are no books at this time that cover JNDI exclusively. There are, however, two books that include some coverage of JNDI as well as other Enterprise Java subjects -- they are listed below.

Java Enterprise in a Nutshell (O'Reilly) Professional Java Server Programming (Wrox Press) LDAP Programming with Java (Addison-Wesley)

Comments and alternative answers

See also Implementing LDAP by Mark Wilcox. Author: Taruvai Subramaniam (http://www.jguru.com/guru/viewbio.jsp?

EID=43495), May 2, 2000See also Implementing LDAP by Mark Wilcox.

Note that there is now a true JNDI book. Check out... Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4), May 17, 2000Note that there is now a true JNDI book. Check out What books cover JNDI?

Note that the book recommended above called "LDAP... Author: Tony Sheehan (http://www.jguru.com/guru/viewbio.jsp?EID=37355), Jun 16, 2000Note that the book recommended above called "LDAP Programming with Java (Addison-Wesley)" does not make use of JNDI but rather Netscape's implementation (Directory SDK).

What's a Naming System or Service?Location: http://www.jguru.com/faq/view.jsp?EID=14444 Created: Feb 15, 2000 Modified: 2000-03-16 23:42:15.702Author: Richard Monson-Haefel (http://www.jguru.com/guru/viewbio.jsp?EID=16)

A naming system associates names with addresses. A phone book is a perfect example of a naming system that associate people's names with phone numbers and addresses. Naming systems are used in computing to make it easier for user to locate and utilize software that is addressable. A software system that exposes a naming system to other software is called a naming service.

A prefect example of a naming service is the Domain Name System (DNS) used by everyone on the World Wide Web. Internet Protocol (IP) addresses are made up of a series of digits separated by "dots" ('.'). The address of jGuru.com, for example, is 216.217.9.172. IP address are great for routing messages among the millions of computers on the Internet, but its not very user friendly. The DNS associates names with these IP addresses so that it's easier for humans to remember addresses of their favorite sites and access them on the Internet.

The rules that govern association of names with IP addresses are called the Domain Naming System. The Berkley Internet Name Domain (BIND) server, which is a type of server used to resolve names into IP addresses using DNS, is an example of a of a naming service.

Naming services are common place in computing. The OS file system on a computer is a type of naming service that associates the addresses of data blocks on a disk drive with file and directory names. Network file systems are also naming services and some, like NIS+ and Novell Netware are an advanced naming service called a directory service.

What's the format of an LDAP URL?Location: http://www.jguru.com/faq/view.jsp?EID=16059 Created: Feb 19, 2000 Modified: 2000-02-21 05:17:23.234Author: John Zukowski (http://www.jguru.com/guru/viewbio.jsp?EID=7)

RFC 2255 defines the basic structure of the LDAP URL. Its basic definition is: "ldap://" [host [":" port] ] ["/" [dn ["?" [attributeList] ["?" [scope] ["?" [filterString] ["?" extensions]]]]]

host and port specify where the LDAP server is located dn is the LDAP Distinguished Name to search for attributeList is a comma-delimited list of what to retrieve scope is either base, one, or sub [base is the default if unspecified] filterSearch is the search filter extensions is a comma-delimited list of extensions

What is an LDAP Distinguished Name?Location: http://www.jguru.com/faq/view.jsp?EID=17639 Created: Feb 24, 2000 Modified: 2000-02-25 05:06:20.193Author: Madhusudan Chaganthi (http://www.jguru.com/guru/viewbio.jsp?EID=1416) Question originally posed by John Zukowski PREMIUM (http://www.jguru.com/guru/viewbio.jsp?EID=7

Distinguished name is a unique name for an entry in the Directory Service.

A directory service has entries that are similar to the UNIX file structure. For e.g., in Unix we have /etc/bin/usr/bin/usr/local

In a LDAP directory service, we can have the distinguished name:

cn=John Zukowski, ou=FAQ Guru, o=JGuru

Where:o is Organizationou is the Organizational Unitcn is the Common Name

In the same LDAP service we can have the distinguished name:cn=John Zukowski, ou=FAQ Member, o=JGuru

Both of these entries relate to same person (John Zukowski), but in different sub-trees (ou). One entry might have different permissions, rights, etc. when compared to the other. So the only way we can distinguish these two entries is by using their Distinguished names.

What's the relationship between LDAP and JNDI?Location: http://www.jguru.com/faq/view.jsp?EID=17763 Created: Feb 24, 2000 Modified: 2000-02-25 05:10:11.085Author: neal ravindran (http://www.jguru.com/guru/viewbio.jsp?EID=17737) Question originally posed by John Zukowski PREMIUM (http://www.jguru.com/guru/viewbio.jsp?EID=7

JNDI has classes provided by Sun that will help your application interact with an LDAP server. JNDI applications work similarly to JDBC applications....Write an application

once and be free to use "drivers" from different vendors. Sun provides the "driver" that will help interact with the LDAP server. Sun also provides "drivers" for other naming services(like CORBA, Netscape)

What Sun has not written is a driver to interact with ADSI(win 2000)

Comments and alternative answers

Java/ADSI? Author: David Pratt (http://www.jguru.com/guru/viewbio.jsp?EID=453513), Jul 11, 2001Are there any solutions for connecting to Active Directory via Java?

I need to know this as well! Author: keith gomoll (http://www.jguru.com/guru/viewbio.jsp?EID=588788), Dec 18, 2001I would really like to know this i am having a hard time here

I need to know this as well! Author: keith gomoll (http://www.jguru.com/guru/viewbio.jsp?EID=588788), Dec 18, 2001I would really like to know this i am having a hard time here

Re: I need to know this as well! Author: maximili malir (http://www.jguru.com/guru/viewbio.jsp?EID=795566), Mar 13, 2002dEFINITELY INTERESTED ALSO , SINCE I DO NOT WASNT TO WRITE IT IN .NET.

Re: I need to know this as well! Author: maximili malir (http://www.jguru.com/guru/viewbio.jsp?EID=795566), Mar 13, 2002dEFINITELY INTERESTED ALSO , SINCE I DO NOT WASNT TO WRITE IT IN .NET.

Can I mix JNDI v1.1 with JNDI v1.2?Location: http://www.jguru.com/faq/view.jsp?EID=25307 Created: Mar 16, 2000 Modified: 2000-03-16 23:59:54.397Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

It depends. Check out JNDI 1.2 Compatibility with JNDI 1.1 page.

Where is the official documentation for JNDI?Location: http://www.jguru.com/faq/view.jsp?EID=25310 Created: Mar 16, 2000 Modified: 2000-03-17 00:00:20.539Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

Check out the JNDI Documentation page.

What's new in JNDI v1.2?Location: http://www.jguru.com/faq/view.jsp?EID=25311 Created: Mar 16, 2000 Modified: 2000-03-17 00:00:50.011Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

Check out the new JNDI features summary.

Where can I get the JNDI reference implementation?Location: http://www.jguru.com/faq/view.jsp?EID=25312 Created: Mar 16, 2000 Modified: 2000-03-17 00:01:14.433Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

From the JNDI download page.

Can I redistribute Sun's JNDI software?Location: http://www.jguru.com/faq/view.jsp?EID=25313 Created: Mar 16, 2000 Modified: 2000-03-17 00:01:43.025Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

The redistribution terms are discused in the JNDI license.

How do you add an entry to an LDAP server using JNDI?Location: http://www.jguru.com/faq/view.jsp?EID=38293 Created: Apr 20, 2000 Modified: 2000-04-21 00:20:54.886Author: Jonathan Bruce (http://www.jguru.com/guru/viewbio.jsp?EID=38290) Question originally posed by Tony Sheehan (http://www.jguru.com/guru/viewbio.jsp?EID=37355

You should take a look here first ... http://java.sun.com/products/jndi/tutorial/ldap/index.html

And then take a look in the 'examples' diretory of the JNDI download.

Comments and alternative answers

There is no example to add a new entry. Author: Alex Surkov (http://www.jguru.com/guru/viewbio.jsp?EID=1036616), Dec 11, 2002There is only example to add new attributes.

There is no example to add a new entry. Author: Alex Surkov (http://www.jguru.com/guru/viewbio.jsp?EID=1036616), Dec 11, 2002There is only example to add new attributes.

Re: There is no example to add a new entry. Author: Jim Werwath (http://www.jguru.com/guru/viewbio.jsp?EID=1146147), Feb 13, 2004I found an example at http://www.openldap.org/lists/openldap-software/200010/msg00342.html

Are there any JNDI tutorials?Location: http://www.jguru.com/faq/view.jsp?EID=50797 Created: May 17, 2000 Modified: 2000-05-17 14:07:17.49Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

Yes, check out The JNDI Tutorial online and/or buy a copy of it here.

What books cover JNDI (Java Naming and Directory Interface)? Location: http://www.jguru.com/faq/view.jsp?EID=50819 Created: May 17, 2000 Modified: 2000-05-17 14:17:58.483Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

Check out The JNDI Tutorial. It's also available on the web.

For other books that are relevant to JNDI, check out Are ther any books that provide decent JNDI coverage?.

How do you use the JNDI ENC to access JavaMail?Location: http://www.jguru.com/faq/view.jsp?EID=75066 Created: Jun 14, 2000 Modified: 2000-06-14 07:30:41.03Author: Steven Lau (http://www.jguru.com/guru/viewbio.jsp?EID=72026) Question originally posed by Se Hee Lee (http://www.jguru.com/guru/viewbio.jsp?EID=21287

First of all, you have to create a javax.mail.Session like you would in accessing other resources such as JDBC connections:

InitialContext ctx = new InitialContext();Session session = (Session) ctx.lookup("java:comp/env/TheMailSession");After that, everything else is the same:

Message msg = new MimeMessage(session);......Depending on the application server you're using, you'll have different ways in setting up the ENC.

What is LDAP (Lightweight Directory Access Protocol)? Location: http://www.jguru.com/faq/view.jsp?EID=109929 Created: Jul 24, 2000 Modified: 2000-07-24 13:11:31.212Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4) Question originally posed by Deepak Kalra (http://www.jguru.com/guru/viewbio.jsp?EID=99188

LDAP is the "Lightweight Directory Access Protocol" and is defined by RFC 2251. Very basically, LDAP is a simpler take on the X.500 directory access protocol.

How can I use a database connection pool within a servlet or JSP page?Location: http://www.jguru.com/faq/view.jsp?EID=112097 Created: Jul 26, 2000 Modified: 2001-02-13 12:32:02.875Author: Ken Young (http://www.jguru.com/guru/viewbio.jsp?EID=58585) Question

originally posed by arun suresh (http://www.jguru.com/guru/viewbio.jsp?EID=110596

If you are using a J2EE Server, you should be able to access a connection pool via JNDI and retreive the a connection. If you are not using a J2EE Server, you can download (or write) a connection pool, and install it into your JSP/Servlet application, and share it via the application space.Comments and alternative answers

See also How do I access a database from my servle... Author: Alex Chaffee (http://www.jguru.com/guru/viewbio.jsp?EID=3), Aug 14, 2000See also How do I access a database from my servlet?

One Connection Pooler Author: Nate McMorris (http://www.jguru.com/guru/viewbio.jsp?EID=929030), Jun 26, 2002A simple and functional and free Connection Pooler is the DbConnectionBroker from javexchange (http://www.javaexchange.com). However... Almost no documentation. So here's what I found. 1) Start really simple, just create the broker object and NOTHING ELSE first. 2) When catching exceptions, use the method catching syntax ( public void method() throws Exception {...} ) rather than using a "try {} catch(){}" clause. 3) You must create your log file first. The Broker won't create it if it doesn't exist. 4) If you're running this inside a JSP/Servlet container, you can't rely on the container's class loader to find the database driver or any other classes you need from the DbConnectionBroker class; you need to make sure the DB Driver etc. is somewhere in your $CLASSPATH. 5) I needed to get this to work inside TOMCAT, and without using Servlets, so I create the broker between the <jsp:useBean...> and </jsp:useBean> tags, then I load that instance into a bean with an "application" cope. Then I can call that bean from any page where I need a connection. 6) Lastly, I couldn't get some of the methods (like idOfConnection() ) to work, so try the methods out one by one to see if they work. -

Re: One Connection Pooler Author: Shane Word (http://www.jguru.com/guru/viewbio.jsp?EID=68418), Jul 1, 2002Another Free DB Connection Pool that has pretty good Documentation is at: http://sourceforge.net/projects/esw/ Its pretty easy to use with a convenience method to load the driver and a single line to get the connection pool.

What special characters do I have to encode for an LDAP name? Location: http://www.jguru.com/faq/view.jsp?EID=113588 Created: Jul 29, 2000 Modified: 2000-07-29 02:46:51.43Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

For LDAP providers, you must encode a space character at the beginning or end of the string, a sharp ("#") character at the beginning of the string, and all of: """, ",", "\", "+", "<", ">", and ";" by preceding the special character using a backslash ("\").

For a more complete scoop on this, check out Handling Special Characters from the JNDI API tutorial.

How do I use JNDI to locate the home interface of an EJB running on a different host? My client's InitialContext doesn't seem to know where the server is.Location: http://www.jguru.com/faq/view.jsp?EID=116655 Created: Aug 1, 2000 Modified: 2001-10-09 23:26:36.597Author: Robert Castaneda (http://www.jguru.com/guru/viewbio.jsp?EID=4362) Question originally posed by Puneet Sachdeva (http://www.jguru.com/guru/viewbio.jsp?EID=28785

This depends on which EJB container / JNDI implementation that you are using.

For example, in WebLogic, you set the javax.naming.Context.PROVIDER_URL property to be the host and port, for example "t3://hostname:7001"

Using the Inprise Application Server, it will do this automatically if you are within the same subnet using the Smart Agent, or you can pass a command-line parameter into the virtual machine.

You should refer to the documentation for the implementation that you are using for the exact specifics.

Comments and alternative answers

How do I use JNDI to locate the home interface of an EJB running on a different host? Author: Sribha Jain (http://www.jguru.com/guru/viewbio.jsp?EID=484436), Aug 27, 2001How do we do this using J2EE server and where is this property specified?

Re: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: James Chiang (http://www.jguru.com/guru/viewbio.jsp?EID=341533), Aug 29, 2001Setting the following env. when instantiating InitialContext: Properties env = new Properties();env.put("java.naming.factory.initial", "com.sun.jndi.cosnaming.CNCtxFactory");env.put("java.naming.provider.url", "iiop://hostname:1050");InitialContext jndiCtx = new InitialContext(env);

Re: Re: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: Sribha Jain (http://www.jguru.com/guru/viewbio.jsp?EID=484436), Aug 29, 2001Thanks, James...but will this work for all application servers...i am using J2EE

server currently. And how do we know whether our iiop port is 1050(as u have given in code).

Re: Re: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: Sribha Jain (http://www.jguru.com/guru/viewbio.jsp?EID=484436), Aug 29, 2001I tried it out but it gives following error on running the client. javax.naming.NameNotFoundException. Root exception is org.omg.CosNaming.NamingC ontextPackage.NotFound at org.omg.CosNaming.NamingContextPackage.NotFoundHelper.read(Unknown So urce) at org.omg.CosNaming.NamingContextPackage.NotFoundHelper.extract(Unknown Source) at org.omg.CosNaming._NamingContextStub.resolve(Unknown Source) at com.sun.jndi.cosnaming.CNCtx.callResolve(Unknown Source) at com.sun.jndi.cosnaming.CNCtx.lookup(Unknown Source) at com.sun.jndi.cosnaming.CNCtx.lookup(Unknown Source) at javax.naming.InitialContext.lookup(Unknown Source) at ConverterClient.main(ConverterClient.java:27)

Re: Re: Re: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: James Chiang (http://www.jguru.com/guru/viewbio.jsp?EID=341533), Aug 29, 2001It's indeed port 1050 for SUN's j2ee RI server. You can type "j2ee -verbose" to find the naming service port. As to solve NotFoundException, just copy j2ee.jar (located at %J2EE_HOME%\lib) to the client end and set into classpath.

Re: Re: Re: Re: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: Sribha Jain (http://www.jguru.com/guru/viewbio.jsp?EID=484436), Aug 29, 2001I have already done that, but the problem persists...

Re: Re: Re: Re: Re: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: moiroux matthieu (http://www.jguru.com/guru/viewbio.jsp?EID=540275), Nov 6, 2001i've just try it and it work tx !

Re[2]: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: Vassilis Mokas (http://www.jguru.com/guru/viewbio.jsp?EID=855498), Apr 26, 2002Can you please tell me the corresponding code for Borland Application Server

4.5 or 5 ? I just want to locate an EJB in BAS using a servlet in Tomcat.

Re[3]: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: Laurent Mihalkovic (http://www.jguru.com/guru/viewbio.jsp?EID=407112), Jul 17, 2002Hi

I was just going through the same discovery process with the Borland AppServer, and found myself at the same place you must have been a while ago...

I found the following document in the Google search cache.

I found it very interesting as it explains some of the basic mechanisms of the Borland Naming service. One thing for sure, Borland uses Corba/IIOP as its underlying communication layer. And unlike LDAP for example, or ven the SUN reference j2ee server, there does not seem to be syntax for specifying a Context.PROVIDER_URL property. However, I found the following bit of code that shows some of the other properties that can be used:

javax.naming.Context context;

// get a JNDI context using the Naming service Hashtable env = new Hashtable(); env.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY, "com.inprise.j2ee.jndi.CtxFactory"); env.put(javax.naming.Context.URL_PKG_PREFIXES, "com.inprise.j2ee"); context = new javax.naming.InitialContext(env);

The documentation states that URL_PKG_PREFIXES is necessary to support the standard java:comp namespace.

Borland uses a runtime discovery mechanism to identify the servers, and in all of the examples, a simple ctx = new InitialContext() does the job of identifying the server dynamically at run-time. My understanding is that there must be a command line parameter for specifying a specific server when more than one is present on the network.

Cheers,laurent

Re[2]: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: test sherchan (http://www.jguru.com/guru/viewbio.jsp?EID=962675),

Jul 24, 2002I am getting the same problem and i am using J2EE server. Can u tell me plz how to set that env.

Re[3]: How do I use JNDI to locate the home interface of an

EJB running on a different host? Author: frank xing (http://www.jguru.com/guru/viewbio.jsp?EID=918691), Oct 23, 2002The way to use JNDI to locate a home interface of an EJB on remote host differs among different application servers. As I am using WebLogic6.1, the steps are as follows: 1. at the client side, set the weblogic.jar in your classpath.

2. You have to prepare a Properties object for initialContext, that is: Properties p = new Properties(); //weblogic's JNDI driver(provider) p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory"); //URL which located the remote server p.put(Context.PROVIDER_URL,"t3://192.168.153.101:7001"); whereas 192.168.153.101 is my remote server's IP address. 3.Then you construct the InitialContext object Context ctx = new InitialContext(p); 4.lookup your EJBHome interface: Object objref = ctx.lookup("com.***.ejb.session.User"); whereas "com.***.ejb.session.User" is your EJB Home interface's JNDI name 5. narrow to the EJBHome return PortableRemoteObject.narrow(objref, UserHome.class); that's all you need to do on WebLogic.

And for other application servers, you need to obtain the corresponding JNDI provider(driver) as step1, set the INITIAL_CONTEXT_FACTORY and PROVIDER_URL as step2 and then follow step 3, 4, 5.

Hope this will be help.

Re: Re[3]: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: Srinivas Tati (http://www.jguru.com/guru/viewbio.jsp?EID=1022849), Nov 7, 2002how can I achieve the same result if i dont want to hard code the hostname . Is there some way of passing the hostname as a parameter ?

Re: Re[3]: How do I use JNDI to locate the home interface of an EJB running on a different host? Author: leena sharma (http://www.jguru.com/guru/viewbio.jsp?EID=1030690), Nov 26, 2002

But if my client application is not using weblogic then also I have to include weblogic.jar. Is there some other way to lookup the bean deployed under weblogic server.

Re: How do I use JNDI to locate the home interface of an EJB running on a different host? [JBoss] Author: Edison Wang (http://www.jguru.com/guru/viewbio.jsp?EID=1149288), Feb 25, 2004I was about to post a new thread on the forums when I see this one... I sort of understood how the looking up to another host is now, but which namespace should I put in for this line? I'm also not sure whether the IIOP for JBoss is on port 1050. env.put("java.naming.factory.initial", "com.sun.jndi.cosnaming.CNCtxFactory");

Lookup for jndi resources on different app/ldap servers Author: Java Developer (http://www.jguru.com/guru/viewbio.jsp?EID=1042536), Jan 2, 2003Take this scenario: I am using iPlanet's app server. My jndi provider is using LDAP in the background. Now I have multiple ejbs each on a different appsever say EJB1 is deployed on AppServer1 EJB2 is deployed on AppServer2 (and essentially different ldap server)

EJB1 uses EJB2 and so does a lookup of EJB2. In the implementation how do I seamlessly lookup EJB2 on AppServer2 ? By seamlessly I mean, is there a configuration in jndi, which does the lookup on a primary server for a resource and not finding it there does a lookup on a secondary ldap server ?

How do I create an authenticated session to an LDAP server?Location: http://www.jguru.com/faq/view.jsp?EID=117303 Created: Aug 2, 2000 Modified: 2000-08-07 10:08:58.382Author: Steve Czulewicz (http://www.jguru.com/guru/viewbio.jsp?EID=117296) Question originally posed by John Zukowski PREMIUM (http://www.jguru.com/guru/viewbio.jsp?EID=7

The authentication is provided when you create the InitialDirContext. Take a look at the snippet below...

private Hashtable _env = new Hashtable();private InitialDirContext _ctx = null;

// Authentication is controlled by the following environment// All values are Strings// Refer to javax.naming.Context

// Authentication method. May also be 'none' or 'Strong'

_env.put(Context.SECURITY_AUTHENTICATION, "simple");

// Distiguished name of user to authenticate_env.put(Context.SECURITY_PRINCIPAL, "cn=username,ou=orgunit,o=company");

// Password or certificate signature_env.put(Context.SECURITY_CREDENTIALS, "myPassword");

this._ctx = new InitialDirContext(this._env);Comments and alternative answers

Can't cn=username,ou=orgunit,o=company go very deep? Author: neal ravindran (http://www.jguru.com/guru/viewbio.jsp?EID=17737), Mar 5, 2003Can't cn=username,ou=orgunit,o=company go very deep? Say for example it could gocn=username,ou=orgunit,ou=anotherOrgUnit,ou=subAnotherOrgUnit, o=company

How would I use that in a corporate env were different users are in different levels? Iow, how would I be able to write a login program capable of being used by any user?

Re: Can't cn=username,ou=orgunit,o=company go very deep? Author: Michael Glasson (http://www.jguru.com/guru/viewbio.jsp?EID=1137313), Jan 15, 2004If you do not know how to form a DN from the user's login name, you first have to perform a directory search using the login name. Then you can get the DN from the search result. This implies either that the directory permits anonymous searches or your search process has authenticated with its own account which is permitted to perform the search.

When (manually) deploying an EJB where do you specify the JNDI name that the bean is bound to in the JNDI tree? Location: http://www.jguru.com/faq/view.jsp?EID=132923 Created: Aug 23, 2000 Modified: 2000-08-24 18:56:25.582Author: satyanarayana sairam (http://www.jguru.com/guru/viewbio.jsp?EID=132906) Question originally posed by Henrik Buch (http://www.jguru.com/guru/viewbio.jsp?EID=121686

[Questioner continues: According to the EJB1.1 spec there is no relation between the <ejb-name> tag in the deployment descriptor (or assembly descriptor) and the JNDI name. I can see that a client can use a "logical" name that can be mapped via vendor specific deployment info (e.g. orion-application-client.xml).]

When you are deploying the application in using Web Logic 4.5.1 server, in the deployment wizard you can specify the JNDI name and using the same name you can look up from the client.

[Is there any standard way to do it? If not, can someone give feedback with info for other servers? -Alex]

Where can I find the API documentation of the Java Naming and Directory Interface (JNDI)?Location: http://www.jguru.com/faq/view.jsp?EID=134137 Created: Aug 24, 2000 Modified: 2000-08-28 19:11:08.331Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

They are available from Sun's J2EE API documentation page. Comments and alternative answers

I've found the O'Reilly book Java Enterprise in a ... Author: Michael Dalrymple (http://www.jguru.com/guru/viewbio.jsp?EID=201651), Sep 9, 2000I've found the O'Reilly book Java Enterprise in a Nutshell to be a great desktop resource for JNDI. It has the standard Nutshell API docs as well as a good overview of how the API is used.

How does one abandon a directory search before completion?Location: http://www.jguru.com/faq/view.jsp?EID=201813 Created: Sep 10, 2000 Modified: 2000-09-11 15:59:21.056Author: Robert Castaneda (http://www.jguru.com/guru/viewbio.jsp?EID=4362) Question originally posed by John Zukowski PREMIUM (http://www.jguru.com/guru/viewbio.jsp?EID=7

To cancel a search, you simply need to close the NamingEnumeration that is returned from the context.search() method.

NamingEnumeration enum = ctx.search( "ou=People", attributes );if ( enum.hasMore() ) {//cancel search by closing Naming Enumeration enum.close();}

Comments and alternative answers

This does not really 'abandon' a search. In LDAP t... Author: Vikram Rajan (http://www.jguru.com/guru/viewbio.jsp?EID=5140), Nov 14, 2000This does not really 'abandon' a search. In LDAP terminology, 'abandon' is a protocol operation which stops the search on the LDAP directory. In this case, the search has already been completed and only the search result enumeration is being

closed.

Where can I get a JNDI provider for NetWare?Location: http://www.jguru.com/faq/view.jsp?EID=217160 Created: Sep 27, 2000 Modified: 2000-10-10 15:49:02.867Author: John Zukowski (http://www.jguru.com/guru/viewbio.jsp?EID=7)

You can pick this up with the rest of the Novell Class Libraries for Java from the Novell Developer Portal.

Are there any complete JNDI service provider (SPI) examples that use federation?Location: http://www.jguru.com/faq/view.jsp?EID=223319 Created: Oct 5, 2000 Modified: 2000-10-05 13:32:13.127Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4) Question originally posed by Shane Jarych (http://www.jguru.com/guru/viewbio.jsp?EID=130672

Hmm... I don't know if this is "complete" enough for you or not but as part of the Building a Service Provider section of Sun's JNDI API Tutorial and Reference there is a lesson which covers Adding Federation Support.

Can I have my JSP container access JSP pages which are not present in a local file system by doing a JNDI lookup?Location: http://www.jguru.com/faq/view.jsp?EID=231498 Created: Oct 18, 2000 Modified: 2001-02-13 12:30:53.181Author: Serge Knystautas (http://www.jguru.com/guru/viewbio.jsp?EID=100012) Question originally posed by Dmitri Paltchoun (http://www.jguru.com/guru/viewbio.jsp?EID=41856

There is nothing in the specification that would prevent you from doing this. The specification defines how requests should get mapped to resources, the syntax and API for JSPs and servlets, and the internal dispatching of requests within a container. It does not address where these are stored, whether the servlets come from a remote class loader or if the JSPs are stored in an LDAP server or other remote location. In fact, the Tomcat project has toyed with the idea of supporting JSPs that come from a database.

The problem you will face though is that there are no implementations available yet that support this. Nonetheless, there are open source projects (such as Tomcat) that I'm sure would be happy to accept code or a patch that had this functionality where you to write it.

How can I configure JNDI to use SSL to connect to an LDAP server?Location: http://www.jguru.com/faq/view.jsp?EID=235601 Created: Oct 24, 2000 Modified: 2000-10-24 16:03:22.526Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4) Question originally posed by John Prout (http://www.jguru.com/guru/viewbio.jsp?EID=49355

Check out Sun's JNDI Tutorial's Security chapter, particularly the SSL and Custom Sockets section.

When using JNDI with LDAP, how can I get the DN (Distinguished Name) from a DirContext?Location: http://www.jguru.com/faq/view.jsp?EID=260006 Created: Nov 22, 2000 Modified: 2000-11-30 19:24:03.068Author: Fdo J. Rendón Quiles (http://www.jguru.com/guru/viewbio.jsp?EID=142691) Question originally posed by Michael Dalrymple (http://www.jguru.com/guru/viewbio.jsp?EID=201651

If you get the DN for a DirContext you have to use the method, getNameInNamespace(). This method retrieves the full name of this context within its own namespace. For example: DirContext ctx;// ...ctx.getNameInNamespace();Comments and alternative answers

Did not work ! Author: Ayman Mahfouz (http://www.jguru.com/guru/viewbio.jsp?EID=286051), Mar 21, 2002i tried that and it printed out an empty String regards

Did not work Author: Ayman Mahfouz (http://www.jguru.com/guru/viewbio.jsp?EID=286051), Mar 21, 2002i tried that and it printed out an empty String

Re: Did not work Author: mos mos (http://www.jguru.com/guru/viewbio.jsp?EID=1111000), Aug 26, 2003You have to use getName(). Like so ...: NamingEnumeration results = ctx.search(LDAPConnectionValues.SEARCHBASE, cn, constraints); if(results != null && results.hasMore()) { SearchResult si = (SearchResult)results.next(); dn = si.getName()+","+LDAPConnectionValues.SEARCHBASE; }

Re: Did not work Author: mos mos (http://www.jguru.com/guru/viewbio.jsp?EID=1111000), Aug 26, 2003You have to use getName(). Like so ...: NamingEnumeration results = ctx.search(LDAPConnectionValues.SEARCHBASE, cn, constraints); if(results != null && results.hasMore()) { SearchResult si = (SearchResult)results.next(); dn = si.getName()+","+LDAPConnectionValues.SEARCHBASE; }

Re[2]: Did not work Author: Philip Stockwell (http://www.jguru.com/guru/viewbio.jsp?EID=1181536), Jun 25, 2004Thanks for that, been trying to get the DN for ages.

Re[2]: Did not work Author: Philip Stockwell (http://www.jguru.com/guru/viewbio.jsp?EID=1181536), Jun 25, 2004Thanks for that, been trying to get the DN for ages.

Re[2]: Did not work Author: Philip Stockwell (http://www.jguru.com/guru/viewbio.jsp?EID=1181536), Jun 25, 2004Thanks for that, been trying to get the DN for ages.

How can I obtain a JNDI Context from inside an applet?Location: http://www.jguru.com/faq/view.jsp?EID=288164 Created: Dec 28, 2000 Modified: 2000-12-28 14:05:24.874Author: John Zukowski (http://www.jguru.com/guru/viewbio.jsp?EID=7) Question originally posed by Remith Raghavan (http://www.jguru.com/guru/viewbio.jsp?EID=222896

To get an initial context from an applet, you need to pass the InitialContext constructor a Hashtable with the Context.APPLET property ("java.naming.applet") set: Hashtable hash = new Hashtable()// this is a reference to the applethash.put(Context.APPLET, this);Context ctx = new InitialContext(hash);The following JNDI parameters would then be read from the APPLET parameters:

java.naming.factory.initial java.naming.factory.object java.naming.factory.state java.naming.factory.control java.naming.factory.url.pkgs java.naming.provider.url java.naming.dns.url

as in <param name="java.naming.factory.initial" value="com.sun.jndi.ldap.LdapCtxFactory">

How can I use LDAP with JSP? Location: http://www.jguru.com/faq/view.jsp?EID=292931 Created: Jan 4, 2001 Modified: 2001-02-13 12:29:40.267Author: Jorge Jordão (http://www.jguru.com/guru/viewbio.jsp?EID=275762) Question originally posed by Maher Arif (http://www.jguru.com/guru/viewbio.jsp?EID=289570

To use LDAP within Java (JSP or not), you must use JNDI (Java Naming and Directory Interface).

A bit like JDBC, JNDI consists of

A list of packages: javax.naming, javax.naming.directory, javax.naming.event and javax.naming.ldap, all included with JDK 1.3 and also available separately at java.sun.com.

Service providers (instead of drivers) that actually implement a given naming or directory service (LDAP, DNS, File system, etc).

Check out the JNDI Tutorial for more information.

Comments and alternative answers

Actually there 2 ways to access LDAP from JSP. You... Author: mark wilcox (http://www.jguru.com/guru/viewbio.jsp?EID=344899), Mar 5, 2001Actually there 2 ways to access LDAP from JSP. You can use JNDI or you can use the Directory SDK for Java from Netscape (www.mozilla.org/directory). The Wrox book, Professional JSP contains a section on LDAP and JSP (or you can download the code from www.wrox.com).

Re: Actually there 2 ways to access LDAP from JSP. You... Author: jsp learner (http://www.jguru.com/guru/viewbio.jsp?EID=890223), Jun 27, 2002Hi, I am trying to access an ldap server for authentication from a jsp page. I am able to make the commandline version work, but jsp is giving me the error ClassDefinitionNotFound Error. So I am guessing it is a configuration issue. I am using the netscape ldap sdk. What do I have to configure for a Tomcat webserver for it to recognise this sdk?

Any help would be greatly appreciated.

Thanks.

Re[2]: Using LDAP to authenticate JSP in Tomcat Author: carl ogden (http://www.jguru.com/guru/viewbio.jsp?EID=947580), Jul 12, 2002Thats actualy a complicated question. First you need to set up a Realm in $Tomcat_Home/conf/server.xml that looks something like this:<Realm className="org.apache.catalina.realm.JNDIRealm" debug="99"connectionName="cn= 2queryldap,cn= Users,dc= warn,dc= com"connectionPassword="above_users_password"connectionURL="ldap://server.dns.name:389"userPattern="cn={0},ou=employees,dc=warn,dc=com" roleBase="cn=users,dc=warn,dc=com"roleName="cn"roleSearch="(member={0})"userPassword="givenName" <-- what field usersPassword is stored inroleSubtree="false" />

This assumes the password you want to use is stored in plain text or in digest format that java can work with. How Tomcat currently works is it grabs the password from ldap either in plain text or in a digest password, then it compares the user submited password witht the retrieved password if they match then it goes and looks to see if what groups (roles) the user is in. This only works if:1) The LDAP server is using a common Digest like SHA or MD52) The userPassword field isn't write_only, which it is in Microsoft Active Directory.Tomcat's JNDIRealm doesn't use a traditional ldap approach of trying to bind to the directory to validate a user. If you want or need to do it this way it gets more complicated.

To make all this work you must have JNDI setup and on the classpath somewhere and the ldap.jar that comes with jndi somewhere on the classpath, if you really want to use netscape's ldapjdk it gets alot more complicated.

if the above does all work for you then you need to tell tomcat what to protect per container. So in the: $Tomcat_Home/webapps/app_name/WEB-INF/web.xml create something like this:<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app><security-constraint><web-resource-collection><web-resource-name>Entire Application</web-resource-name><url-pattern>/*</url-pattern></web-resource-collection><auth-constraint><role-name>PUT_GROUP_NAME_HERE</role-name></auth-constraint></security-constraint><login-config><auth-method>BASIC</auth-method><realm-name>My Secure Realm</realm-name></login-config>

</web-app>

any changes to theese file requires a restart. LDAP debug information can be found in:$Tomcat_home/logs/catalina_log.2002-07-12.txt for what ever day it is.

once the user is authenticated you can get information about the user from the supplied request object:request.getUserPrincipal();request.isUserInRole("some group name");request.getUserPrincipal().getName();

If you want/need to use the Netscape ldapjdk.jar or you need to bind to the ldap directory because of a non standard digest format or userPassword is a write_only then you need do the following.

1)Create a new realm there is no documentation to do this so you got to go to the tomcat source, the easyiest way is to make a copy of org.apache.catalina.realm.JNDIRealm.java leave it in the same package, if you want to use Netscape's ldapjdk you need to change:contextFactory = "com.sun.jndi.ldap.LdapCtxFactory";with the contextFactory="com.netscape.jndi.ldap.LdapContextFactory"and put ldapsp.jar on the classpath

to make it use the more common bind technique for authentication you need to rewrite/modify theprotected String getUserDN(DirContext dircontext, String s, String s1) funtions = username from browsers1 = password user typedFunction needs to return users Full DN if authenticated or null if not.

compile your new class and put it in:$Tomcat_home/server/classes/org/apache/catalina/realmchange your server.xml className="org.apache.catalina.realm.JNDIRealm" to match your new class name and restart.

its easyer than it sounds.

Carl

Re[3]: Using LDAP to authenticate JSP in Tomcat Author: Michael Glasson (http://www.jguru.com/guru/viewbio.jsp?EID=1137313), Jan 15, 2004Carl said, "How Tomcat currently works is it grabs the password from ldap either in plain text or in a digest password, then it compares the user submited password witht the retrieved password..." This is not actually true. The JNDI Realm happily uses the bind method, at least the one in Tomcat 5 does.

Re[3]: Using LDAP to authenticate JSP in Tomcat Author: José Miguel Loor (http://www.jguru.com/guru/viewbio.jsp?EID=1143982), Feb 5, 2004Hi: I tryed your realm configuration XML Object but everytime i stop / start the service and opens an Browser window with http://localhost:8080/ the Apache Service stops. It just hangs up What can i be doing wrong ? Thanks

Re[4]: Using LDAP to authenticate JSP in Tomcat Author: Ken Young (http://www.jguru.com/guru/viewbio.jsp?EID=901514), Apr 30, 2004Did you check the error logs?

Re[3]: Using LDAP to authenticate JSP in Tomcat Author: M. Saquib Kazi (http://www.jguru.com/guru/viewbio.jsp?EID=1221778), Jan 18, 2005Can u please provide some specifications for using the same code on JRun Server

Re[3]: Using LDAP to authenticate JSP in Tomcat Author: Egon Müller-Lüdenscheid (http://www.jguru.com/guru/viewbio.jsp?EID=1238196), Apr 13, 2005Hello Carl , You wrote : "LDAP debug information can be found in: $Tomcat_home/logs/catalina_log.2002-07-12.txt" . I read that file , and it contains one line for JNDIRealm: "JNDIRealm[Jira-engine]: Connecting to URL ...." . I had expected to find more information about the many steps in Tomcat evaluating & executing the many attributes of the <Realm> element . I had expected to find lines like lookupUser... ...successfully authenticated returning 1 role ... What exactly do I have to configure in order to get these debug messages ? Regards , Egon

In using DirContext.search() and using the password field as a filter, I'm getting a NamingException with "no such algorithm" as the message. What does that mean? Location: http://www.jguru.com/faq/view.jsp?EID=316475 Created: Jan 30, 2001 Modified: 2001-02-13 17:08:02.962Author: Nicholas Whitehead (http://www.jguru.com/guru/viewbio.jsp?EID=1260) Question originally posed by Tony Karam (http://www.jguru.com/guru/viewbio.jsp?EID=305982

I suspect that what your JNDI provider is telling you is that it cannot decrypt the password in order to compare it to the value that you have supplied. I would cease using the password as a filter.

How can I get the cleartext version of a password through JNDI? Location: http://www.jguru.com/faq/view.jsp?EID=344900 Created: Mar 5, 2001 Modified: 2001-03-15 15:51:05.691

Author: mark wilcox (http://www.jguru.com/guru/viewbio.jsp?EID=344899) Question originally posed by Kunwar Asheesh Saxena (http://www.jguru.com/guru/viewbio.jsp?EID=324415

You can't, unless the password is stored in cleartext in the directory (which would be a bad idea). The passwords are encrypted using a strong 1-way hash function such as MD5 or SHA1 (SHA1 being the most common and preferred function).

Are there any JNDI service providers which support Micrsoft's Windows security/authentication services?Location: http://www.jguru.com/faq/view.jsp?EID=344902 Created: Mar 5, 2001 Modified: 2001-03-15 15:50:20.522Author: mark wilcox (http://www.jguru.com/guru/viewbio.jsp?EID=344899) Question originally posed by John Mitchell PREMIUM (http://www.jguru.com/guru/viewbio.jsp?EID=4

Microsoft's sytsems can be broken down into 5 discrete areas: 1. Messaging -- Exchange has a quite capable LDAP interface 2. NT Domains -- There's no way to get access to NT domains from JNDI currently 3. ActiveDirectory -- Active Directory is an LDAP capable system 4. Windows 2000 Authentication -- Win2K authentication via ActiveDirectory is

through Kerberos. So JNDI isn't valid here, that's a JAAS issue. 5. Windows 2000 DNS -- You should be able to manage Windows 2000 DNS

system either from LDAP through AD or via the JNDI DNS provider.

Comments and alternative answers

Is there any source code to access MS Active Directory? Author: kvu kle (http://www.jguru.com/guru/viewbio.jsp?EID=460337), Jul 30, 2001Is there any source code to access MS Active Directory? or Exchange. I'm trying to create email accounts through Exchange server. Can this be done through JNDI.

Re: Is there any source code to access MS Active Directory? Author: Brandon Smith (http://www.jguru.com/guru/viewbio.jsp?EID=872401), May 9, 2002

I too am looking for some code to access AD using jndi. If you have solved this it would be helpful! Sorry I can't answer. Thanks

Re[2]: Is there any source code to access MS Active Directory? Author: Balla Niang (http://www.jguru.com/guru/viewbio.jsp?EID=875338), May 12, 2002hi here is a simple code example. Customize it to your system /* Retourne des attributs bien determiner d'un objet apres l'avoir chercher en fournissant certains de ces attributs. */ import javax.naming.*; import javax.naming.directory.*; import java.util.Hashtable; public class Search

{ public static void printSearchEnumeration(NamingEnumeration enum) { try { while (enum.hasMore()) { SearchResult sr = (SearchResult)enum.next(); System.out.println(">>>" + sr.getName()); GetattrsAll.printAttrs(sr.getAttributes()); } } catch (NamingException e) { e.printStackTrace(); } } public static void main(String[] args) { // rechargement de l'environnement de l'initialisation du context Hashtable env = new Hashtable(11); env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory"); env.put(Context.PROVIDER_URL, "ldap://digactive:389/dc=intraucad,dc=ucad,dc=sn"); env.put(Context.SECURITY_AUTHENTICATION,"simple"); env.put(Context.SECURITY_PRINCIPAL,"cn=administrateur,cn=users,dc=intraucad,dc=ucad,dc=sn"); // specify the username env.put(Context.SECURITY_CREDENTIALS,"digactive"); // specify the password try { // Crer le context initial DirContext ctx = new InitialDirContext(env); // Specifie les ids des attributs à retourner String[] attrIDs = {"sn", "telephonenumber", "mail"}; // Specifie les attributs que doit avoir l'objet // cherché ici l'attribut ("sn") // avec la valeur "titi" // et un attribut "mail" . Attributes matchAttrs = new BasicAttributes(true); // ignore case matchAttrs.put(new BasicAttribute("sn", "titi")); matchAttrs.put(new BasicAttribute("mail")); // Cherche parmi les objets de "toto" ceux ayant de tels attribut NamingEnumeration answer = ctx.search( "ou=toto",matchAttrs, attrIDs); // Imprimer la reponse printSearchEnumeration(answer); // Clore le context ctx.close(); } catch (Exception e) { e.printStackTrace(); } } }

Where can I find a JNDI service provider which uses an SQL database as its backing store? Location: http://www.jguru.com/faq/view.jsp?EID=344908 Created: Mar 5, 2001 Modified: 2001-03-15 15:47:01.873Author: mark wilcox (http://www.jguru.com/guru/viewbio.jsp?EID=344899) Question originally posed by Fredrik Hultkrantz (http://www.jguru.com/guru/viewbio.jsp?EID=265955

The answer to your question will depend upon what you're trying to do. If you're looking for a LDAP server with a SQL server, then you should probably check out Oracle's OID system which is Oracle's LDAP server. Most directory servers don't use SQL because SQL is ineffecient for LDAP and unecessary. Most people believe you need an SQL server for transactions to keep things stable. But there are several flavors of embedded databases like Sleepycat's Berkeley Database (used by IPlanet among others) which provides for large databases that are extremely quick and still provide thing like transaction support (IPlanet uses this feature) so your directory server can recover its databases from a crash.

Next, SQL is a relational model, while JNDI supports a heiararchical model. Perhaps the better question is there an Object Database that supports JNDI? (And the answer is not that I know of, but they *could* exist)

If you're looking for a better object support for your Java applications from your databases, then you you should be looking into an object database or an API that allows object wrappers around JDBC ops.

Comments and alternative answers

Regarding better object support for accessing pers... Author: David Smiley (http://www.jguru.com/guru/viewbio.jsp?EID=347254), Mar 16, 2001Regarding better object support for accessing persistent information... isn't JNDI the closest J2EE standard that does this? For this reason I am considering making a JDBC SPI. The only down side I see is that there would be another object wrapping layer. -- David Smiley MITRE

Re: Regarding better object support for accessing pers... Author: David Sanders (http://www.jguru.com/guru/viewbio.jsp?EID=237928), Aug 25, 2001Will you share your JDBC SPI with me? I want to do simple lookups. I want something simple. I could use an RMI SPI but there is no persistence if the RMI registry or its host fails.

Re: Re: Regarding better object support for accessing pers... Author: David Smiley (http://www.jguru.com/guru/viewbio.jsp?EID=347254), Aug 25, 2001I said that I considering building one; I didn't :-/

Is there a JNDI service provider for NIS+? Location: http://www.jguru.com/faq/view.jsp?EID=351568 Created: Mar 15, 2001 Modified: 2001-03-15 14:45:15.031Author: raghavendra ghorpade (http://www.jguru.com/guru/viewbio.jsp?EID=344479) Question originally posed by Anthony Ng (http://www.jguru.com/guru/viewbio.jsp?EID=294982

As for now there is no sevice provider for NIS+ but there is JNDI sevice provider for NIS that is -- com.sun.jndi.nis.nisctyfactory.

How can I retrieve the results of a LDAP search in pages and also define number of entries on each page?Location: http://www.jguru.com/faq/view.jsp?EID=353054 Created: Mar 16, 2001 Modified: 2001-03-16 10:02:36.425Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4) Question originally posed by venkat ravula (http://www.jguru.com/guru/viewbio.jsp?EID=279259

Set the Context.BATCHSIZE property before you create the context: // Set the batch size to 25...env.put ("java.naming.batchsize", "25");

DirContext dc = new InitialDirContext (env);//...

What's the difference between JNDI lookup(), list(), listBindings(), and search()? Location: http://www.jguru.com/faq/view.jsp?EID=353071 Created: Mar 16, 2001 Modified: 2001-03-16 10:07:33.094Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

lookup() attempts to find the specified object in the given context. I.e., it looks for a single, specific object and either finds it in the current context or it fails.

list() attempts to return an enumeration of all of the NameClassPair's of all of the objects in the current context. I.e., it's a listing of all of the objects in the current context but only returns the object's name and the name of the class to which the object belongs.

listBindings() attempts to return an enumeration of the Binding's of all of the objects in the current context. I.e., it's a listing of all of the objects in the current context with the object's name, its class name, and a reference to the object itself.

search() attempts to return an enumeration of all of the objects matching a given set of search criteria. It can search across multiple contexts (or not). It can return whatever attributes of the objects that you desire. Etc. It's by far the most complex and powerful of these options but is also the most expensive.

Comments and alternative answers

Help Author: Stefano Balloni (http://www.jguru.com/guru/viewbio.jsp?EID=1112879), Sep 4, 2003I need a method to extract every deployed ejb because if i try to lookup my ejb i receive an error. It says that the name of the ejb that i serch for is wrong. I'm sure that the name is rigth... how can i get all the names of my deployed ejb? List() method requires a string but i don't know what he want!! Help please!

Where can I learn (more) about Application Servers?Location: http://www.jguru.com/faq/view.jsp?EID=431183 Created: May 30, 2001 Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

Check out the jGuru AppServer FAQ.

Where can I learn (more) about Java's EJB (Enterprise JavaBeans)? Location: http://www.jguru.com/faq/view.jsp?EID=431189 Created: May 30, 2001 Modified: 2001-06-15 23:12:08.671Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

Check out the jGuru EJB FAQ.

Where can I learn (more) about sending email in Java and the JavaMail library? Location: http://www.jguru.com/faq/view.jsp?EID=431202

Created: May 30, 2001 Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

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Where can I learn (more) about Sun's Jini network technology? Location: http://www.jguru.com/faq/view.jsp?EID=431208 Created: May 30, 2001 Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

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Where can I learn (more) about Java's support asynchronous and publish/subscribe messaging using JMS (Java Message Service)? Location: http://www.jguru.com/faq/view.jsp?EID=431210 Created: May 30, 2001 Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

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Where can I learn (more) about Java's support for transaction processing?Location: http://www.jguru.com/faq/view.jsp?EID=431948 Created: May 31, 2001 Author: John Mitchell (http://www.jguru.com/guru/viewbio.jsp?EID=4)

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How do I initiate a JNDI lookup from an applet?Location: http://www.jguru.com/faq/view.jsp?EID=739382 Created: Jan 29, 2002 Author: Luigi Viggiano (http://www.jguru.com/guru/viewbio.jsp?EID=101985) Question originally posed by Sanjit Singh (http://www.jguru.com/guru/viewbio.jsp?EID=533804

First, in the jar file of your applet you will need followin classes included: 1. Classes from the jar with the client portion of your specific jndi provider

classes 2. Classes from the the jar containing javax.naming standard extensions. 3. Classes from the jar containing javax.rmi.PortableRemoteObject (only if the

retrieved object are CORBA objecs) 4. The classes you want to lookup.

Then, the host where the lookup has to be done must be the same from wich your applet has been downloaded (otherwise the applet must be signed).The client browser must be able to open a connection to the port of where the naming service is listening (be sure about proxy settings etc.). The client browser must have Java 2 (Java Plugin 1.2.x) Then the code is always the same:

Properties props = new Properties();props.setProperty("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory" );props.setProperty("java.naming.provider.url", "codebaseurl:1099");

Context ctx = new InitialContext(props);Object ref = ctx.lookup("jndi_name");Note: it's generally avoided to use applet working on remote object, for such many difficulties and for applet security limitations, so it's better to think about applet asking services to server object thru servlets.