Wednesday, January 31, 2018

Top 5 Free Git Courses for Programmers to Learn Online - Best of Lot

One of my goals in 2018 is to learn and master Git and I have been searching some good tutorials and courses to start with. The Internet is full of git tutorials and a simple Google search will leave you thousands of tutorials but the big question mark is where do you start? It's easy to pick a tutorial or a blog post if you have some background about what is Git, what it does? and how to use it but if you don't have much background then you need a course which can tell you all the information from the ground up. I personally like learning from a book or an online course before moving to blog posts as they were often well structured. When you search for Git courses in popular online course websites e.g. Udemy, Pluralsight or Coursera, you will find some good courses e.g. Git Complete: The Definitive Guide on Udemy and Git Fundamentals from Pluralsight which will teach you everything about Git step by step. These are excellent resources to start with Git.

Tuesday, January 30, 2018

Top 5 Hibernate and JPA Courses for Java Developers to Learn Online

Hibernate is one of the essential frameworks for Java and Java EE or JEE programmers, especially if you are working on the server side of a Java web development project. It's an ORM tool or a framework which allows you to deal with only objects while Hibernate takes care of your data on your behalf. For example, instead of writing classes with SQL to load, save, and update data using DAO design pattern, you can simply use Hibernate framework in your project. It will allow you to deal with just objects while it will load, save, and update data in the background. Instead of you loading and saving data to/from the database and then populating objects, Hibernate just give you a readymade object and also takes care of updating data when the state of object changes. Btw, this is just one benefit of using Hibernate, another one is that it provides inbuilt caching.

Monday, January 29, 2018

7 Reasons to Use Spring to develop RESTful Web Services in Java

REST has now become a standard way to develop web services and when it comes to Java, there are many frameworks and library available e.g. JAX-RS, Restlet, Jersey, RESTEasy, Apache CFX etc, but I encourage Java developers to use Spring framework to develop RESTful web services. But, some of you might ask, why use Spring Framework to develop RESTful web services in Java? What is the advantage and why it's better than other frameworks and libraries available out there? Well, the most important reason I think to use Spring for developing RESTful web service is that you can use your Spring MVC experience to develop RESTful web services.

Sunday, January 28, 2018

How to deal with ConcurrentModificationException in Java? Beware while removing elements from ArrayList in loop

One of the common problem while removing elements from an ArrayList in Java is the ConcurrentModificationException. If you use classical for loop with the index or enhanced for loop and try to remove an element from the ArrayList using remove() method, you will get the ConcurrentModificationException but if you use Iterator's remove method or ListIterator's remove() method, then you won't get this error and be able to remove the element. It's an unwritten rule in Java that while looping through the list, you should not add() or remove() elements until the collection supports fail-safe Iterator e.g. CopyOnWriteArrayList, which operate on a copy of list rather than the original list.

Saturday, January 27, 2018

10 Unit Testing and Integration Tools and Libraries for Java Developers

In last a couple of weeks, I have written some articles about what Java developer should learn in 2018 e.g. programming languages, libraries, and frameworks, but if you have just one thing to improve or learn then that must be your automation testing skills. Testing is one of the disciplines which separates professional developers with amateur ones. It's not about following TDD, BDD, or whatever testing methodologies but at the very minimum level, you must write code to test your code automatically. Many Java developers write unit tests and integration tests which automatically run during build time, mostly by using continuous integration tools like Jenkins or TeamCity.

Thursday, January 25, 2018

3 Ways to Learn Spring Core, Spring MVC, Spring Security, and Spring Boot Framework

If you are a Java developer and wants to learn Spring framework then you have come to the right place. In this article, I will share three ways to learn Spring framework, but before that let's understand what is a spring framework and why Java developers should learn Spring framework? Well, Spring is a framework which assists you to develop Java application by following some best practices, particularly the principle of dependency injection and inversion of control. As per this principle, instead of class asking for its dependency, the framework provides them at runtime.  Following these principles improves your code quality because it reduces coupling between different part of your applications e.g. between modules and classes, which makes them easier to test and develop.

Wednesday, January 24, 2018

10 Tools Every Software Developer/Programmer should know

Every trade has their tools and software development is no different. A good programmer or software developer generally know their tools better than others and also have access to more powerful and advanced tools than a average programmer, but there are certain tools which you expect every software developer should know and this list is all about such tools. In this list, I am going to share 10 essential tools, which I believe every programmer or software developer should know and know well.

Monday, January 22, 2018

10 reasons to Learn Scala Programming Language

One of the questions my reader often ask me is, shall I learn Scala? Does Scala has better future than Java, or why Java developer should learn Scala and so on. Well, there can be many reasons for learning Scala e.g. you are forced to learn because it been used in the new company you joined or your solution architect decided to use it, but that's a different story. Here, we'll talk about reasons which encourage Java developers to learn Scala.  Scala has emerged as one the most powerful Java alternative in recent times. It's been the JVM language of choice, leaving Groovy and Clojure way behind, and preferred as the language people want to write most code in.

Saturday, January 20, 2018

Top 5 Free Data Structure and Algorithm Courses for Java and C Programmers

Data Structure and Algorithm is one of the essential topics for programmers, both to get a job and do well on Job. A good knowledge of data structure and algorithm is the foundation of writing good code. If you are familiar with essential data structures e.g. array, string, linked list, tree, map and advanced data structure e.g. tries, AVL trees etc and know when to use which data structure and compute the CPU and memory cost of your code in terms  Even though you don't need to write your own array, linked list or hashtable, given every major programming SKD provides them e.g. JDK or C++ STL library, you will need to understand them so that you can use them in right place. Using a right data structure can drastically improve the performance of an algorithm.

Friday, January 19, 2018

How Http Basic Authentication works in Spring Security?

In the last article, you have learned how to enable Http basic authentication in Spring security based Java application and now we'll go one step further to understand how exactly http basic authentication works in Spring security. If you remember, when you use HTTP Basic for authentication purpose the client e.g. browser or a rest client sends login credentials in http request header. The header is aptly named as "Authorization" and it contains based 64 encoded string which is created by concatenating username and password using a colon. For example, if the username is "johnsmith" and password is "JOHN3214" then they will be concatenated as "johnsmith:JOHN3214" before encoded using base 64 encoding algorithms.

Thursday, January 18, 2018

What is a Functional interface in Java 8? @Functional Annotation and Examples

The functional interface is one of the most important concepts of Java 8 which actually powers lambda expression but many developers don't put enough effort to understand it and spend time learning lambda expression and Stream API without first understanding the role of functional interface in Java 8. Unless you know what is a functional interface and how lambda is related to it, you can't use powerful features of Java 8 e.g. lambda expression and stream API. Without knowledge of functional interface, you won't be able to understand where you can use a lambda in the code but also you will struggle to write lambda expression the method is expecting, hence, it's important to have a good understanding of functional interface in Java 8.

Wednesday, January 10, 2018

Top 20 Libraries and APIs Java Developer should know

One of the traits of a good and experienced Java developer is the extensive knowledge of API, including JDK and third-party libraries. I spent a good deal of time learning API, especially after reading Effective Java 3rd Edition, where Joshua Bloch has advised to use existing API for development rather than writing new pieces of code for common stuff. That advise making sense to me because of the testing exposure these 2nd party libraries get. In this article, I am going to share some of the most useful and essential libraries and API, a Java developer should be familiar with. Btw, I am not including frameworks e.g. Spring and Hibernate because they are pretty well known and have specific features.