JNDI interview questions for fresher/JNDI Interview Questions and Answers for Freshers & Experienced

What is WebLogic JNDI WLInitialContextFactory?


The WLInitialContextFactory creates initial contexts for accessing the WebLogic naming service. It can also be used to create a multitier connection to another naming service through a WebLogic Server. ... INITIAL_CONTEXT_FACTORY, "weblogic. jndi.

What is Jtatransactionmanager?

The Java™ Transaction API (JTA) allows applications to perform distributed transactions, that is, transactions that access and update data on two or more networked computer resources. ... The application. The application server. The transaction manager. The resource adapter.

What does @transactional do in Java?

Transactional annotation provides the application the ability to declaratively control transaction boundaries on CDI managed beans, as well as classes defined as managed beans by the Java EE specification, at both the class and method level where method level annotations override those at the class level.

What is WebLogic JNDI?

The WebLogic Server JNDI Service Provider Interface (SPI) provides an InitialContext implementation that allows remote Java clients to connect to WebLogic Server. ... Enter that name in the JNDI Name attribute field when you create the object. When the object is loaded, JNDI provides a path to the object.

What is JTA and JNDI?

They are three completely different things. JDBC - Java Database Connectivity. JNDI - Java Naming and Directory Interface. JTA - Java Transaction API.

What is difference between JNDI and JDBC?

Well these are two different things. JDBC is Java Database Connectivity API, while JNDI is Java Naming and Directory Interface API. The main thing here is that in a JNDI directory you're actually storing a JDBC DataSource, so, you're simply using JDBC to obtain a Connection via JNDI lookup.

What is JNDI Mcq?

What is JNDI? JNDI stands for Java Naming and Directory Interface. JNDI allows distributed applications to look up services in an abstract, resource-independent way. It is an API that provides naming and directory functionality to applications written using Java.

What is its basic use?

JNDI allows distributed applications to look up services in an abstract, resource-independent way.

JNDI full form in java

The Java Naming and Directory Interface™ (JNDI) is an application programming interface (API) that provides naming and directory functionality to applications written using the Java™ programming language. It is defined to be independent of any specific directory service implementation.

Explain the creation of a thread-safe singleton in Java using double-checked locking.

Singleton is created with the double-checked locking as before Java 5 acts as a broker and it’s been possible to have multiple instances of singleton when multiple threads create an instance of the singleton at the same time. Java 5 made it easy to create thread-safe singleton using Enum. Using a volatile variable is essential for the same.

Compare overloading with overriding.

Overloading refers to the case of having two methods of the same name but different properties; whereas, overriding occurs when there are two methods of the same name and properties, but one is in the child class and the other is in the parent class.

Explain method overloading.

When a Java program contains more than one method with the same name but with different properties, then it is called method overloading.

What Is Xfn And How Does This Relate To Jndi?

XFN is X/Open Federated Naming, a C-based standard for accessing multiple, possibly federated naming and directory services.

A programmer familiar with XFN will find it easy to use JNDI.

How Does Jndi Relate To Omg's Corba Standards For Naming?

A Java CORBA application can use JNDI to access to the CORBA (COS) name service, as well as other naming and directory services.

It offers the application one interface for accessing all these naming and directory services.

Using JNDI also paves the way for Java CORBA applications to use a distributed enterprise-level service like LDAP to store object references.

Who Will Provide Implementations Of Jndi?

At the time of this writing, IBM, Novell, Sun, and WebLogic have produced service providers for JNDI.

Where Is Jndi Being Used In The Java Platform?

HotJava Views 1.1 is using JNDI to access LDAP.

Enterprise APIs such as

<> Enterprise JavaBeans
<> Java Message Service
<> JDBC 2.0

make use of JNDI to for their naming and directory needs.

RMI over IIOP applications can use JNDI to access the CORBA (COS) naming service.

What Is An Ldap Server ? And What Is It Used For In An Enterprise Environment ?

LDAP stands for Lightweight Directory Access Protocol. This is an extensible open network protocol standard that provides access to distributed directory services. LDAP is an Internet standard for directory services that run on TCP/IP. Under OpenLDAP and related servers, there are two servers slapd, the LDAP daemon where the queries are sent to and slurpd, the replication daemon where data from one server is pushed to one or more slave servers. By having multiple servers hosting the same data, you can increase reliability, scalability, and availability.

<> It defines the operations one may perform like search, add, delete, modify, change name
<> It defines how operations and data are conveyed.

LDAP has the potential to consolidate all the existing application specific information like user, company phone and e-mail lists. This means that the change made on an LDAP server will take effect on every directory service based application that uses this piece of user information. The variety of information about a new user can be added through a single interface which will be made available to Unix account, NT account, e-mail server, Web Server, Job specific news groups etc.

When the user leaves his account can be disabled to all the services in a single operation. So LDAP is most useful to provide "white pages" (e.g. names, phone numbers, roles etc) and "yellow pages (e.g. location of printers, application servers etc) like services. Typically in a J2EE application environment it will be used to authenticate and authorize users.

What Is A Jndi Initialcontext ?

All naming operations are relative to a context. The InitalContext implements the Context interface and provides an entry point for the resolution of names.

What Is A Directory Service?

Searching for files and directories done by providing Directory services. A directory service is a set of names. The user and resource information and machine addresses are summarized by directory service. For example, for a given user name, the service returns the attributes of the user such as telephone no, email address etc. A directory service use the databases that specialized and hierarchical in design.

Explain The Importance Of Jndi?

To centralize the information storage the enterprises uses LDAP. The information is of user names, passwords, email addresses, printers, determination of database access. Multiple database management is reduced by centralizing the information.

How can we delete one attribute in LDAP with LDIF?

dn: cn=USER,ou=groups,dc=s2rsolutions,dc=com
changetype: modify
delete: uniqueMember
uniqueMember: cn=jsmith,ou=users,dc=s2rsolutions,dc=com

What Is Xfn And How Does This Relate To Jndi?

XFN is X/Open Federated Naming, a C-primarily based general for having access to more than one, likely federated naming and directory offerings.A programmer acquainted with XFN will locate it clean to apply JNDI.

What is LDIF?

LDIF is used for exchanging data between the LDAP directory servers.The content is represented as a group of attributes, as the records are separated from one another by blank lines while the attributes of the record that are represented as single logical lines.LDIF deploys tools such as Microsoft Windows 2000 Server, Windows 2003 Server, JXplorer, Netscape Communicator, and OpenLDAP.

What is Port Number for LDAP?

Port number for LDAP are LDAP - 389 and LDAPS - 636.

What is XFN and how does this relate to JNDI?

XFN is X/Open Federated Naming, a C-based standard for accessing multiple, possibly federated naming and directory services.
A programmer familiar with XFN will find it easy to use JNDI.

How does JNDI relate to Microsoft's ADSI?

The Java ADSI package allows Java programs to access Active Directory based on the COM model.
Although it can be used to access other directories, it is a Windows-centric solution.
JNDI offers Java applications, regardless of whether they're running on Windows or accessing Active Directory, to access directories using the Java object model.
For example, you can manipulate objects such as AWT and JavaBeans components, bind them into the directory, and look them back up without having to do any translation or deal with data representation issues.

How does JNDI relate to OMG's CORBA standards for naming?

A Java CORBA application can use JNDI to access to the CORBA (COS) name service, as well as other naming and directory services.
It offers the application one interface for accessing all these naming and directory services.
Using JNDI also paves the way for Java CORBA applications to use a distributed enterprise-level service like LDAP to store object references.

How Does Jndi Relate To Netscape's Java Ldap Api?

Netscape's API is LDAP-particular. It is used for low-degree access to LDAP directories. It exposes details about the protocol that applications usually do now not need to realize.

How Does Jndi Relate To Ldap?

JNDI offers an notable object-orientated abstraction of listing and naming. Developers using JNDI can produce queries that use LDAP or other get right of entry to protocols to retrieve results; however, they're now not confined to LDAP nor do they need to expand their packages stressed to LDAP. JNDI supports the key competencies in LDAP v3.

What Protocols Does Jndi Provide An Interface To?

JNDI itself is independent of any precise listing access protocol. Individual provider vendors determine the protocols to guide.There can be issuer implementations for popular protocols, including LDAP, NDS, DNS, and NIS(YP), provided by unique vendors.

Who Will Provide Implementations Of Jndi?

At the time of this writing, IBM, Novell, Sun, and WebLogic have produced carrier providers for JNDI.

Where Is Jndi Being Used In The Java Platform?

HotJava Views 1.1 is using JNDI to get entry to LDAP.Enterprise APIs including Enterprise JavaBeans
Java Message Service
JDBC 2.Zero
make use of JNDI to for their naming and listing wishes.RMI over IIOP programs can use JNDI to get admission to the CORBA (COS) naming service.

Who Should Use Jndi?

Any Java utility that desires to access information about users, machines, networks, and services. User statistics includes protection credentials, smartphone numbers, digital and postal mail addresses, and alertness possibilities. Machine records includes network addresses, gadget configurations, etc. In addition, any Java application that wishes to both export items or get entry to objects exported via other applications and offerings. Examples include printers, calendars, and networked document structures.

So Where Does Jndi Fit Into This Ldap ?

JNDI affords a trendy API for interacting with naming and directory offerings using a provider issuer interface (SPI), which has similarities to JDBC driving force. To connect to an LDAP server, you should acquire a reference to an item that implements the DirContext. In maximum packages, that is executed by means of using an InitialDirContext object that takes a Hashtable as an argument: Hashtable env = new Hashtable();
env.Placed(Context.INITIAL_CONTEXT_FACTORY, "com.Solar.Jndi.Ldap.LdapCtxFactory");
env.Positioned(Context.PROVIDER_URL, "ldap://localhost:387");
env.Put(Context.SECURITY_AUTHENTICATION, "easy");
env.Put(Context.SECURITY_PRINCIPAL, "cn=Directory Manager");
env.Put(Context.SECURITY_CREDENTIALS, "myPassword");
DirContext ctx = new InitialDirContext(env);

Uses of LDAP?

A large no. Of machines can have a common list of login users.

Reading accesses and responsiveness is fast.

LDAP can be used to cluster when failover occurs.

Difference between JNDI list and listBindings method.

list() attempts to return an enumeration of all of the objects in the current context as NameClassPair.

listBindings() attempts to return an enumeration of all the object bindings in the current context.

Why do we need JNDI when communication using LDAP is possible?

JNDI provides lookup of resources like a database or a message queue enabling a uniform way to access directory services.

Components of JNDI.

The JNDI architecture consists of an API and a service provider interface (SPI). Java applications use the JNDI API to access a variety of naming and directory services.

Naming Interface organizes information hierarchically and maps human-friendly names to addresses or objects that are machine-friendly. It allows access to named objects through multiple namespaces.

JNDI includes a directory service interface that provides access to directory objects, which can contain attributes, thereby providing attribute-based searching and schema support.

Service Provider Interface(SPI) supports the protocols provided by third parties.

What is JNDI Lookup?

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

Does JNDI support Security?

Yes. JNDI allows for applications to work in conjunction with directory-specific security systems.

How does JNDI relate to LDAP?

JNDI provides an excellent object-oriented abstraction of directory and naming. Developers using JNDI can produce queries that use LDAP or other access protocols to retrieve results.

What is a directory service?

Searching for files and directories done by providing Directory services. A directory service is a set of names. The user and resource information and machine addresses are summarized by directory service. For example, for a given user name, the service returns the attributes of the user such as telephone no, email address etc. A directory service use the databases that specialized and hierarchical in design.

Explain what is a naming service in JNDI?

Lightweight Directory Access Protocol
Developed by the University of Michigan.
It is a protocol for locating organizations, individuals, and other resources such as files and devices in a network, whether on the public Internet or on a corporate intranet.

Tell me what do you know about LDAP?

Lightweight Directory Access Protocol
Developed by the University of Michigan.
It is a protocol for locating organizations, individuals, and other resources such as files and devices in a network, whether on the public Internet or on a corporate intranet.

What is the importance of JNDI?

To centralize the information storage the enterprises uses LDAP. The information is of user names, passwords, email addresses, printers, determination of database access. Multiple database management is reduced by centralizing the information.

What do you know about the directory service of JNDI?

Searching for files and directories done by providing Directory services. A directory service is a set of names. The user and resource information and machine addresses are summarized by directory service. For example, for a given user name, the service returns the attributes of the user such as telephone no, email address etc. A directory service use the databases that specialized and hierarchical in design.

How to use LDAP to work with a directory service?

An LDAP directory can be distributed among many servers.
Each server can have a replicated version of the total directory that is synchronized periodically.
An LDAP server is called a Directory System Agent (DSA).
An LDAP server that receives a request from a user takes responsibility for the request, passing it to other DSAs as necessary, but ensuring a single coordinated response for the user.

What is JNDI?

JNDI stands for Java Naming and Directory Interface. JNDI allows distributed applications to look up services in an abstract, resource-independent way.

It is an API that provides naming and directory functionality to applications written using Java. It is independent of any specific directory service implementation so it can be accessed in a common way.

It is used to set up a database connection pool on a Java EE application server. Any application that's deployed on that server can gain access to the connections they need using the JNDI name java:comp/env/FooBarPool without having to know the details about the connection.

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