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The Apache HTTP Server, also known as httpd , has been the most popular web server on the Internet since April of 1996. It is both free and robust and that's the reason that almost half of the world's websites runs on Apache HTTP web server, ranging from small hobby websites to huge e-commerce giants and big banks. There are also many companies which use Apache and Tomcat to host Java web application. In a typical setup, Apache web server receives the HTTP request and depending upon the URL it either route to Tomcat or serve the static files directly from the file system. These questions are based mostly on that experience. Though Apache is not just famous in Java world it is even more popular with other web technologies e.g. Perl, PHP, and MySQL. It's one of the powerful and secure web servers so anyone can use it to handle HTTP traffic. It supports both HTTP and HTTPS . It's worth noting that Apache is also an HTTP/1.1 compliant web server. Read more �

If you are working in Java, you might have heard about Scala, Groovy, and Closure. Out of these three Groovy seems to be gaining a place in Java projects more rapidly than others. Groovy is a Scripting language but runs on Java virtual machine. Every Java program can run on Groovy platform. As per official Groovy website, "Apache Groovy is a powerful, optionally typed and dynamic language, with static typing and static compilation capabilities, for the Java platform aimed at improving developer productivity thanks to a concise, familiar and easy to learn syntax". I think, they have highlighted the key capabilities of Groovy very well in that sentence. It basically further reduce the burden from Java developer with respect to coding. Now, you can put more focus on business logic and get your work done quickly without wasting time on writing more code. Read more �

If you are preparing for Programming Job interviews and looking for some of the best books for programming questions then you have come to the right place. In this article, I am going to share a couple of good books to prepare coding, software design, and data structure algorithm questions, which are essential for any coding interviews. Though a programming interview also explores other areas of software development e.g. the programming language you would be mainly using in your project e.g. C++ or Java. The database and SQL based questions, the operating systems and UNIX related questions, some of the software design and object oriented design pattern questions and much more, but coding based questions forms the core of programming interviews. Read more �

Hi Guys, Here is one of the classical programming questions asked to me first time on an interview with multinational Investment bank. After that, this question has been asked to me on several occasions in other programming job interviews as well. What makes this question interesting is that Java developers are not that great with the data structure as compared to C++ developer which is obvious because of the fundamental difference between these two languages. The C++ is more of system programming language while Java is more on application programming , also a rich set of Java API allows the programmer to skip this kind of basic programming techniques. Read more �

These Google interview questions are some of my favorites collected from different sources. Every Programmer knows that Google is one of the best technology company and its dream for many software developers to work for google, but at same time interview process at google is very tough and only a few genuine intelligent programmers get through their interview process . Google interview questions have always been a good topic of discussion when few young software developer gathered around, I can still remember when one of my friends got a call from google for an interview then how the whole bunch was got excited. We have searched a lot on the internet on google interview questions and answers for him and us and then make a note of some of the best questions for preparation. I am listing down some google interview questions from that list. Read more �

RESTful web services heavily rely on HTTP by design. They use different HTTP methods to perform their job and uses HTTP response code to inform clients about success or failure of a particular request. REST stands for Representational State transfer and it uses HTTP to allow two systems to communicate via remote calls. RESTFul web services is a collection of REST URI which points to resources. These URI can point to a single resource of a collection of resource. For example, you would expect /employee/101 to contain details employee with 101 and /employees to return a list of all employees. In RESTFul web service, HTTP request types signify the action to take for the resource. Read more �

XML Interview questions are very popular in various programming job interviews, including Java interviews for web developer . XM L is a matured technology and often used as standard for transporting data from one platform other. XML Interview questions contains questions from various XML technologies like XSLT which is used to transform XML files, XPATH , XQ uery and fundamentals of XML e.g. DTD or Schema . In this article we will see 10 frequently asked XML Interview questions and answers from above topics. These questions are mostly asked in various Java interviews but they are equally useful in ot her programming interviews like C, C++, Scala or any other programming language. Since XML is not tied with any programming language and like SQL its one of the desired skill in programmer, it make sense to practice some XML questions before appearing in any technical job interview Read more �

How to find second highest or second maximum salary of an Employee is one of the most frequently asked SQL interview question similar to finding duplicate records in table and when to use truncate vs delete . T here are many ways to find second highest salary based upon which database you are using as different database provides different feature which can be used to find second maximum or Nth maximum salary of employee. Well this question can also be generalized with other scenario like finding second maximum age etc. In this SQL tutorial we will see different example of SELECT SQL query to find second highest salary independent of databases or you may call in ANSI SQL and other SQL queries which uses database specific feature to find second maximum salary. Read more �

JSTL foreach loop in JSP JSTL foreach tag is pretty useful while writing Java free JSP code. JSTL foreach tag allows you to iterate or loop Array List , HashSet or any other collection without using Java code. After introduction of JSTL and expression language(EL) it is possible to write dynamic JSP code without using scriptlet which clutters jsp pages. JSTL foreach tag is a replacement of for loop and behaves similarly like foreach loop of Java 5 but still has some elements and attribute which makes it hard for first-timers to grasp it. JSTL foreach loop can iterate over arrays, collections like List , Set and print values just like for loop. In this JSP tutorial we will see couple of example of foreach loop which makes it easy for new guys to understand and use foreach loop in JSP. By the way this is our second JSP tutorial on JSTL core library, in last tutorial we have seen How to use core <c:set> tag in JSP page . Read more �

Save vs saveOrUpdate vs persist in Hibernate What is difference between save and saveOrUpdate or Difference between save and persist are common interview question in any Hibernate interview, much like Difference between get and load method in Hibernate . Hibernate Session class provides couple of ways to save object into database by methods like save , saveOrUpdate and persist . You can use either save() , saveOrUpdate() or persist() based upon your requirement for persisting object into Database . Along with Spring framework Interview questions , Hibernate questions are also quite popular on J2EE interviews because of its status as leading ORM. It�s good to prepare some questions from Hibernate before appearing in any J2EE interviews . One of them is Difference between save , saveOrUpdate and persist , which we will see in this Hibernate article. Read more �

Deleting empty file and directory in Unix Many times we need to find and delete empty files or directories in UNIX/Linux. Since there is no single command in Unix/Linux which allows you to remove empty files or empty directories rather we need to rely on find command and xargs command . In this UNIX and linux example we will see How to delete empty files and directories. Before removing empty files and directories we need to find those files and there are lots of option available to search for empty directories like find , grep , awk etc. You just need to know correct option. Like in any other operating system empty files and directories in Unix are those whose size is zero. Empty files doesn't contains any content while empty directories does not contain anything at all e.g files or sub-directories. As discussed in previous post 10 frequently used find command examples we can also use find command to search and delete empty files and directories as it provides searching files b...

What is JSESSIONID in JSP-Servlet JSESSIONID is a cookie generated by Servlet containers like Tomcat or Jetty and used for session management in J2EE web application for HTTP protocol. Since HTTP is a stateless protocol there is no way for Web Server to relate two separate requests coming from the same client and Session management is the process to track user session using different session management techniques like Cookies and URL Rewriting . If a Web server is using a cookie for session management it creates and sends JSESSIONID cookie to the client and then the client sends it back to the server in subsequent HTTP requests . JSESSIONID and session management is a not only a popular Servlet interview question but also appear in various JSP interviews . Along with What is JSESSIONID interviewer are also interested in when and how JSESSIONID is created in Servlet and JSP which we will see in next section. Read more �