2024-04-24 14:31
One of the most essential parts of Spring MVC is the @Transactional annotation, which provides support for transaction management and allows developers to concentrate on coding business logi… Read More
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Blog about Java programming language, FIX Protocol, Tibco RV
2024-04-23 15:09
The heap dump is a great source of information on identifying memory related issues on Java application e.g. web and application servers like Tomcat, WebLogic, JBoss, WebSphere and IDEs lik… Read More
2024-04-22 04:42
There is no doubt that the Spring Framework is one of the most popular Java frameworks and makes it really easy to create real-world, enterprise-grade Java applications easy by providing fe… Read More
2024-04-19 15:35
Hello guys, Spring Security is one of the most popular security frameworks in the Java world and I strongly believe that every experienced Java developer should learn it. Because of its popu… Read More
2024-04-12 02:10
The @RequestMapping annotation is one of the most important annotation of Spring MVC which provides mapping of HTTP requests to controller methods, I mean Java methods on Controller class f… Read More
2024-04-10 15:25
If you don't know, Spring security can limit the number of sessions a user can have in a Java web application. If you are developing a web application especially a secure web applicat… Read More
2024-04-10 10:03
Hello guys, if you are a beginner looking for a job as Java developer but not sure you should know then you have come to the right place. I get fresh computer engineers from colleges, intern… Read More
2024-04-09 04:54
In the last article, I have taught you how to enable Http basic authentication in Spring security-based Java application, and now we'll go one step further to understand how exactly ht… Read More
2024-04-09 04:45
Today one of my readers asked about what is the latest OCPJP or Oracle Java exams available and is there a Java certification available for Java SE 19 and Java SE 17?. This prompte… Read More
2024-04-09 04:40
Hello guys, if you are struggling to solve Exception in thread "main" java.util.ConcurrentModificationException" error in Java and wondering why this error comes even if you are not using mu… Read More
2024-04-08 15:07
I know how frustrating is to see "Exception in thread "main" java.lang.NoClassDefFoundError" while running your Java application. This is one of the dreaded problem in Java whic… Read More
2024-04-08 09:04
In the last article, I have shown you how to sort a Map in Java 8 by keys, and today, I'll teach you how to sort a Map by values using Java 8 features e.g. lambda expression, method referen… Read More
2024-04-08 09:01
Being the author of a Java blog and a certified Java programmer, I receive lots of questions about the usefulness of Java certifications like SCJP, now known as OCJP or OCPJP. Questions lik… Read More
2024-04-08 08:57
One of the most common SQL interview questions is to find the Nth highest salary of employees, where N could be 2, 3, 4 or anything e.g. find the second highest salary in SQL. Sometimes thi… Read More
2024-04-08 04:58
Hello guys, I have read many books on data structures and algorithms like Introduction to Algorithms by Thomas H. Corman and Algorithm design manual by Steve S. Skiena, so when I come… Read More
2024-04-08 04:49
Hello guys, are you looking for a simple example of how to use SELF JOIN in SQL? If yes, then you have come to the right place. This article will show you how to use Self join in solving in… Read More
2024-04-06 07:45
Hello friends, in last a couple of years, I have seen an increase in coding problems where interviewer expect you to solve using functional programming concepts and particularly map() and f… Read More
![For Gumroad Day, My Java, SQL, And Spring Books Are 'Pay What You Want', $1 Minimum [TODAY ONLY]](https://cdn.blogarama.com/images/posts_thumbs_site_id/2140/214035-1860880833.w320.jpg "For Gumroad Day, My Java, SQL, And Spring Books Are 'Pay What You Want', $1 Minimum [TODAY ONLY]")
2024-04-04 08:11
Hello guys, just wanted to write a short post about the Gumroad Day sale and the once-in-a-lifetime opportunity to buy my books for just 1$ (minimum). Yes, Gumroad Day is back and its… Read More
2024-03-31 10:40
Hello guys, Cloud Computing is a great skill to learn in 2024 as more and more companies are moving to Cloud. and Azure is a cloud computing offered by the gain Microsoft for deploying your… Read More
2024-03-19 04:46
In some cases while using Hibernate for object-relational mapping, you will encounter the N+ 1 select problem. That is, Hibernate will execute (n+1) queries to populate a list of records of… Read More
2024-03-17 14:57
The Apache Tomcat is one of the most popular web server used to deploy Java web application comprising HTML, JavaScript, Servlet and JSP. If you have ever worked in a Java web application y… Read More
2024-03-14 14:04
A good knowledge of HTTP protocol is must for a RESTful Web Service developer because REST uses HTTP principles and a good portion of its popularity is due to HTTP itself. One of the importa… Read More
2024-03-09 10:05
The Gson library is a gift from Google to Java developers. It provides the simplest but powerful mechanism to deal with JSON documents in Java. By using Gson library, you can parse JSON Str… Read More
2024-03-07 13:41
Servlet and Filter are two of the essential concepts defined in Servlet specification. They are core of any web application because most of the request will pass through them. This is why t… Read More
2024-03-03 14:03
Hello guys, parsing and creating JSON is a very common task in any Java application, particularly spring based application and that's why its important for a Java developer to not just under… Read More
2024-03-02 03:18
If you have used SSH to login into remote host in Linux, you might have come across these two files stored under the .ssh directory in your home directory e.g. ~/.ssh. Both files are used in… Read More
2024-03-02 02:30
You can use the split() method of java.lang.String class to split a string based on the dot. Unlike comma, colon, or whitespace, a dot is not a common delimiter to join String, and that's w… Read More
2024-02-29 10:31
The ContextLoaderListener is one of the important component of Spring MVC framework. It is like any listener defined by Servlet specification and specified in web.xml using tag. It is loade… Read More
2024-02-01 03:59
No doubt that Generics is one of the most confusing topics in Java and you can easily forget concepts and rules, especially, if you don't code Java everyday. For example, both List> and… Read More
2024-01-23 04:23
Hello guys, I have been talking about AWS certifications for quite some time now and in the past shared how to prepare for AWS Cloud Practitioner, AWS Developer Associate, and AWS Solution… Read More
2024-01-13 06:58
Time is changing and so is Java interviews. Gone are the days, when knowing the difference between String and StringBuffer can help you to go through the second round of interview, questions… Read More
2024-01-08 14:57
As I have said before, Practice tests and exam dumps play an important role in not just passing the AWS Certified Cloud Practitioner certification (CLF-C02) but also achieving a high s… Read More
2024-01-07 14:25
Hello guys, If you want to learn regular expression better in Java, you must remember meaning of all the special characters. They are the one, which makes a regular expression complex, but… Read More
2024-01-07 06:45
Hello guys, It seems everyone is over the cloud nowadays. Wherever I go people talk about Cloud computing and cloud platforms like AWS, Azure, Google Cloud, Digital Ocean, etc. And, there i… Read More
2024-01-05 07:28
Hello guys, Microsoft Azure a cloud-based service that serves as a framework for businesses to manage their services and applications, amongst other things that enable them to run a success… Read More
2024-01-04 15:01
Hello guys, being a Java blogger, many Java developers ask me questions like "I am learning Java, should I also learn Maven or Gradle?" or "Is it mandatory to learn Maven to get a job as a J… Read More
2024-01-04 14:51
Hello guys, based on the new Azure role-based certification path, the Microsoft AZ-305 exam is the primary step towards becoming a Microsoft Certified Azure Solutions Architect. Earlier, I… Read More
2024-01-04 07:26
Hello there, if you are preparing for Microsoft Azure Fundamentals or AZ-900 certification exam and looking for some practice test to check your knowledge, then you have come to the right p… Read More
2024-01-03 14:13
Hello guys, if you want to learn Artificial Intelligence, Generative AI, and Prompt Engineering then you are thinking on right direction. More and more companies are asking their workforce t… Read More
2024-01-01 14:52
The database administrator is one of the most in-demand jobs nowadays since companies need someone who manages and maintains the infrastructure of their database where they store all their… Read More
2023-12-18 07:11
In last article, I have shared thoughts on how to enable Spring Security on Java Web application, where my reader also shown interest to know how to configure/enable Spring MVC in Java web… Read More
2023-12-11 09:48
One of the common requirement of secure Java application is to show and hide content based upon role of current user. For example, a logged in user can see his name e.g. Welcome User1 but t… Read More
2023-12-06 12:56
Hello guys, if you are looking for cloud certifications in 2024 then Microsoft Azure Cloud certifications can be a great addition to your profile. Azure certifications are one of the top cl… Read More
2023-12-04 14:07
If you an experienced programmer and know how to write SQL queries and database fundamentals but want to take your SQL and database skills to the next level then you have a come to the righ… Read More
2023-12-04 10:20
One of the common task while using Spring Security in a Java web application is getting the username of currently logged in user. Sometime, you need that in your controller class and someti… Read More
2023-11-27 15:55
Data Structure and Algorithm is one of the essential topics for programmers, both to get a job and do well on Job. Good knowledge of data structure and algorithm is the foundation of writin… Read More
2023-11-27 04:44
Hello guys, In last a couple of articles, we have learned how Spring MVC framework works and what is the role of DispatcherServlet in Spring MVC. We have briefly touched another frequently… Read More
2023-11-20 09:32
One of the Spring security question asked to me on a recent interview was about is it enough to hide portions of JSP to protect a URL from unauthorized access in Spring security? First of a… Read More
2023-11-13 09:55
One of the common feature of secure Java web application to show the username as link on the top right corner of web application once user successfully logged in. Some application also show… Read More
2023-11-06 07:41
In last article, I have showed you how to update value in HashMap and today we'll learn about how to update value in a ConcurrentHashMap. Some of you may question, can we use the same techn… Read More
2023-10-30 10:21
More and More companies are adopting Microservices architecture e.g. Uber and Netflix already uses it and many startups I know is choosing REST and MicroService as the standard way to… Read More
2023-10-23 07:41
Hello guys, if you have learned Java in early 2000 then there is good chance that you must have written your first Java code using System.out.println(). For a long time, I have no ide… Read More
2023-10-16 04:40
Coding is an integral part of Programming, and we all somehow learned to code by following examples here and there. Yes, I am talking about both self-taught programmer and Computer Science… Read More
2023-10-10 15:05
If you are running Java program in Eclipse and ever tried playing with -Xmx parameter you know about those virtual machine initialization error e.g. "“Error occurred during initializat… Read More
![How To Fix Java.net.SocketException: Connection Reset By Peer: Socket Write Error? [Solved]](https://cdn.blogarama.com/images/posts_thumbs_site_id/2140/214035-659072238.w320.jpg "How To Fix Java.net.SocketException: Connection Reset By Peer: Socket Write Error? [Solved]")
2023-10-09 15:13
"Exception in thread "main" java.net.SocketException: Software caused connection abort: socket write error" comes when you are writing into a connection which is already closed by your… Read More
2023-10-08 13:33
You can remove blanks for whitespaces from a Java String by using the trim() method of java.lang.String class of JDK API. Unlike SQL Server which have LTRIM() and RTRIM() methods to remove… Read More
2023-10-07 04:29
In the last article, You have learned how to enable the remember-me functionality in Spring security and today you will learn how does Remember Me work under the hood. So far, you know… Read More
2023-10-04 15:21
There are many ways to sort an ArrayList in Java 8; for example. you can use the old but still rocking way to sort a List by using Collections.sort() method, or you can use the newly added… Read More
2023-10-03 15:05
Hello guys, most of the web application has login or authentication functionality where user need to enter their username and password to access functionalities provided by application. Thi… Read More
2023-10-02 09:09
Hello guys, if you are preparing for System design interview then you must have come across System Design Interview - An Insider's Guide by Alex Xu, one of the most popular book on System De… Read More
2023-10-01 15:22
Hello guys, if you are preparing for coding interview and wondering whether the classic Cracking the Coding Interview book by Gayle Laakmann McDowell still worth it in 2023 then you have com… Read More
2023-09-30 09:30
The java.lang.UnsupportedClassVersionError is a quite common error after NoClassDefFoundError or ClassNotFoundException they all seems to related to class files but they all are diff… Read More
2023-09-30 09:25
How to solve java.lang.NoSuchMethodError: main Exception in thread "main"
java.lang.NoSucMethodError comes when Java code tries to call a method that does not exist on a class, this coul… Read More
2023-09-29 14:57
Hello guys, If you are new to Java or Object oriented programming and wondering what is Polymorphism and Inheritance and what are their use then you have come to the right place. Polymorphis… Read More
2023-09-29 04:47
java.net.ConnectException: Connection refused: connect is one of the most common networking exceptions in Java. This error comes when you are working with client-server architecture and tr… Read More
2023-09-29 04:45
How to fix java.util.NoSuchElementException in Java
java.util.NoSuchElementException is a RuntimeException that can be thrown by different classes in Java like Iterator, Enumerator, Scann… Read More
2023-09-28 14:48
Hello guys, DevOps, a combination of software development and IT operations, has become a widely adopted approach in the modern software industry. It emphasizes collaboration, automation, a… Read More
2023-09-27 14:09
Concurrency is a fundamental aspect of modern software development, and Java provides a variety of tools and classes to help developers manage shared resources and coordinate the behavior o… Read More
2023-09-26 10:26
Hello guys, Concurrency in Java can be a challenging aspect of software development. As applications become more multithreaded and concurrent, Java developers often face issues related to t… Read More
2023-09-25 04:28
Hello guys, you can sort an ArrayList in Java without using the sort() method from the Collections class or the List interfaces' sort() method by implementing your own sorting algorith… Read More
![How To Fix Class File Has Wrong Version 61.0, Should Be 53.0 Error In Spring Boot? [Solved]](https://cdn.blogarama.com/images/posts_thumbs_site_id/2140/214035-3625968190.w320.jpg "How To Fix Class File Has Wrong Version 61.0, Should Be 53.0 Error In Spring Boot? [Solved]")
2023-09-24 08:33
Hello guys, The "class file has wrong version" error typically occurs when you're trying to run a Java application compiled with a higher Java version than the one supported by your current… Read More
2023-09-24 07:51
How to convert a string to long in Java is one of those frequently asked questions by a beginner who has started learning Java programming language and is not aware of how to convert from… Read More
2023-09-23 08:18
One of my reader was struggling with debugging a Java web application, containing Servlet and JSP in Eclipse with Tomcat. While helping him, I realized that I have not written anything abou… Read More
2023-09-23 07:39
float and double are two data type which is used to store floating-point values in Java and we often need to convert String to float in Java and sometimes even a Float object or float primi… Read More
2023-09-22 15:04
As a Java programmer, you've likely encountered the term "Dependency Injection" (DI) in your development journey. Dependency Injection is more than just a buzzword; it's a design principle t… Read More
2023-09-22 03:53
How to check if an integer number is a power of 2 in Java is one of the popular programming interview questions and has been asked in many interviews. Surprisingly, this problem which look… Read More
2023-09-22 03:50
How to find the factorial of a number in Java in both recursive and iterative ways is a common Java interview question mostly asked at the fresher level. It’s not just popular in Jav… Read More
2023-09-21 14:15
One of the key skill of a Java programmer is his mastery over Collection framework, he must know when to use which collection class in Java. He must remember that Map is for key value pair… Read More
2023-09-21 04:53
Write a Java program to find if a number is odd or even is one of the basic programming exercises, and anyone will be happy to see this in actual Java Interviews, wouldn't you? By the wa… Read More
2023-09-21 04:52
How to print Prime numbers in Java or how to check if a number is prime or not is classical Java programming questions, mostly taught in Java programming courses. A number is called a prim… Read More
2023-09-19 14:39
Write a Java program to check if two String is an anagram of each other, is another good coding question asked at fresher level Java Interviews. This question is on a similar level of find… Read More
2023-09-19 14:35
What is ClassNotFoundException in Java ClassNotFoundException is one of Java nightmare every Java developer face in there day to day life. java.lang.NoClassDefFoundError and java.lang.Clas… Read More
2023-09-19 14:29
This is another post of my tibco tutorial series , if you want to read more about tibco rv or tibco ems please read there. in this post I am sharing you great tool to solve tibco rv relate… Read More
2023-09-18 13:48
Hello guys, its been a long time since I shared any FIX protocol tutorial, I think almost 12 years but today is the day. If you are using FIX Protocol to create derivative trading systems
in… Read More
2023-09-18 04:38
Hello guys, if you're wondering what is atomic operator in Java and how Atomic variable works then you have come to the right place. Earlier, I have shared difference between atomic, volatil… Read More
2023-09-17 15:51
Any enterprise program that deals with data storage and retrieval must incorporate transaction management. Annotations like @Transactional and @EnableTransactionManagement in Spring make it… Read More
2023-09-17 10:05
You can also solve the producer-consumer problem by using a new lock interface and condition variable instead of using the synchronized keyword and wait and notify methods. The lock p… Read More
2023-09-16 15:40
Many Java programmers think that a += b is just a shortcut of a = a + b, which is only half correct. Though it expands exactly like that and in many cases it produce same result, especially… Read More
2023-09-16 06:31
The thread is one of the important Classes in Java and multithreading is the most widely used feature, but there is no clear way to stop Thread in Java. Earlier there was a stop method tha… Read More
2023-09-16 04:55
ReentrantLock in Java is added on java.util.concurrent package in Java 1.5
along with other concurrent utilities like CountDownLatch, Executors, and CyclicBarrier. ReentrantLock is one of… Read More
2023-09-16 04:51
Multithreading and synchronization are a very important topic for any Java programmer. Good knowledge of multithreading, synchronization, and thread-safety can put you in front of other d… Read More
2023-09-16 04:42
Most of the Java developers know that wait(), notify(), and notifyAll() methods of object class must have to be called inside synchronized method or synchronized block in Java but how many… Read More
2023-09-15 15:47
Well, this is absolute beginner post in Java and Why I am writing this? because of a question, which actually confused me? Do you know what is the size of boolean variable in Java? Does it t… Read More
2023-09-15 15:37
What is CountDownLatch in Java
CountDownLatch in Java is a kind of synchronizer which allows one Thread to wait for one or more Threads before starts processing. This is a very cruc… Read More
2023-09-15 15:36
Surprisingly "Difference between transient and volatile keyword in Java" has asked many times on various java interviews. volatile and transient are two completely different keywords from… Read More
2023-09-15 14:24
Think about a scenario where you would have to find at the run time whether a Java thread has a lock on a particular object e.g. find out whether thread NewsReader has a lock on a &helli…Read More
2023-09-15 07:58
Blocking methods in Java are those methods that block the executing thread until their operation is finished. A famous example of the blocking method is the InputStream read() method w… Read More
2023-09-15 07:54
The Producer-Consumer Design pattern is a classic concurrency or threading pattern which reduces coupling between Producer and Consumer by separating Identification of work with Execution o… Read More
2023-09-14 14:32
Every Java programmer wants to code fast and this is important because Java is more verbose than some of the cool scripting languages e.g. Python. Eclipse Code templates can help you to wri… Read More
2023-09-14 14:18
Books are essential to learning something new, and despite being in the electronic age, where books have lost some shine to the internet and blogs, I still read and recommend them to get co… Read More
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