Disclosure: This article may contain affiliate links. When you purchase, we may earn a small commission.

10 Free Courses to Learn System Design and Software Design in 2022 - Best of Lot

Hello guys, if you are preparing for System Design Interview or just want to improve your Software design skills and looking for best free resources like tutorials and free online courses then you have come to the right place. In the past, I have shared best System design coursesbookswebsites, and popular System design questions but a lot of you asked for free resources and that's why I am going to share best free System design courses I found online. These online courses are completely free and provides a diverse knowledge about different System design concepts and process. They are also created by experienced trainers and teacher who has gone through the same process and available on trusted online platforms like Udemy and YouTube. You can join one or more of these free System design courses to not only improve your Software design skill but also to prepare for your next System Design Interview. 

Top 5 Websites to Learn System Design and Software Design in 2022

Hello guys, if you are preparing for System design Interview and looking for best resources to master Software design and System design then you have come to the right place. Earlier, I have shred best System Courses, Books, and System Interview Questions and in this article, I am going to share best places to learn System design in 2022. Before we get to the best websites that will teach you everything you need to know about system design, let me tell you a little bit about what it really is. Systems design is basically the process of defining elements of a system including modules, architecture, components, interface, and data for a system based on a specific set of requirements. It can also refer to the process of defining, developing, and designing systems. These designs have to satisfy the specific needs of a company or an organization.

How to Learn Kubernetes, AWS, Azure, and Google Cloud using Whizlabs Hands-on Labs ?

Hello guys, Cloud computing is rapidly becoming one of the essential skill for all kind of developers and no matter what you will need to learn Cloud Computing if you want to remain marketable. I learned this truth couple of years ago and since then spent a lot of time learning AWS, Azure, Kubernetes, Docker, and Google Cloud Platform. The big problem with learning Cloud computing and different cloud platform like AWS and Azure is that you cannot learn them by reading books or watching course. You need real, hands-on practice which can only be possible by either using the free tier of respective platform or using hands-on labs like the one provided by Whizlabs and QwikLabs.  In this article, I am going to review Whizlab's comprehensive offering of hands-on labs to learn Cloud related technologies like Kubernetes, AWS, Azure, Openshift, Google Cloud Platform and Snowflake better.

Difference between Checked vs Unchecked Exception in Java? Example

Checked and Unchecked Exception is two types of Exception exist in Java. Though there is no difference in functionality and you can very achieve the same thing with either checked Exception or Unchecked Exception, there is some difference on exception handling part. In this Java tutorial we will see what is checked and Unchecked Exception in Java, Examples of Checked and Unchecked Exception and most importantly we will learn when to use Checked Exception and when to use Unchecked Exception in Java and lastly we will see the difference between checked and unchecked exception to understand things better. 

[Solved] How to solve java.lang.UnsatisfiedLinkError: no ocijdbc11 in Java with Oracle 11g, 12c, 19c and 21c

"java.lang.unsatisfiedlinkerror no ocijdbc11 in java.library.path" error comes when you try to connect to Oracle 11g database using OCI (thick) driver by using tns name, but the ocijdbc11.dll file is not available in PATH or java.library.path environment variable. ocijdbc11.dll is a native library and if you know Java searches native library in PATH or a location specified by java.library.path system property, if it doesn't find the dll, then it throws java.lang.unsatisfiedlinkerror no ocijdbc11 in java.library.path error. This dll is usually found in C:\Programs\Oracle\ora11g\bin\ocijdbc11.dll, but it could vary depending upon your Oracle installation.

How to deal with NullPointerException in Java with Examples - java.lang.NullPointerException Guide

The java.lang.NullPointerException or NullPointerException in Java is probably the first error or exception you will face in Java. It is a true nightmare for beginners in Java but pretty easy to solve once you get familiar with Exception handling in Java. What makes NullPointerException a little bit tricky to solve is its name which has a pointer in itself and Java does not support pointers like C++ or C, just like you don't have multiple inheritances in Java. As a Java developer with 20 years of experience, I have solved countless amount of NullPointerException and now I have developed a coding and debugging sense through which I can spot what causing a particular NullPointerException and how to fix it. 

How to use @EnableTransactionManagement in Spring Framework and Spring Boot? Example Tutorial

Spring Boot has a lot many annotations within its framework that a person can use. If you are searching for one, you have come to the right place. Needless to say, these annotations are essential for building a Spring Boot web application. Today we will look at an annotation that is widely used for transaction management in spring. So, what's the wait?! Let's start! But, before jumping into the sea of spring, let's first understand what a transaction means in spring and what it signifies. A transaction is used in Spring JPA which communicates to the database. we all know what a transaction represents on a database level. If not, no worries! let us all recall.

How to Fix 'javac' is not recognized as an internal or external command in Windows and Linux? Example

Hello guys, if you are trying to compile your Java source file and getting "'javac' is not recognized as an internal or external command" in Windows or Linux machine like Windows 10 or Redhat 8 but not sure what to do then you have come to the right place. This is a common Java related error and can occur to an operating system like Windows, Mac or Linux if java is not installed properly like only JRE is installed and JDK is not installed or javac is not added on PATH environment variable. In this article, I will explain what this error is and how you can fix it by following step by step guide I share, but if you still cannot solve this problem on your own then just ask for help in comments. But don't forget to check your PATH environment variable because that's where JDK/bin directory needs to be present, which contains all Java related commands including "javac" and "java" which are used to compile and run Java applications.

[Solved] How to fix VirtualBox - /sbin/mount.vboxsf: mounting failed with the error: Protocol error

Virtual box is a great tool for Java developer to run Docker and Linux on Windows Machine, especiall for them who need to develop and debug Java program in Linux environment. I use Oracle's virtual machine, VirtualBox to run the Linux operating system from my Windows machine. It's the most simple way to have two operating systems on your laptop or PC. Since I run most of the Java programs in Linux, VirtualBox gives me a nice interface to run UNIX commands right from the Windows box. This blog post is about the mounting of a shared folder failed error in Oracle's Virtualbox VM. It was working fine the day before yesterday and now, after I restarted my virtual box and tried to mount my shared folder, I was greeted by this error: "/sbin/mount.vboxsf: mounting failed with the error: Protocol error"

How to fix java.lang.UnsupportedClassVersionError: Bad version number in .class files? Example

How to fix Bad version number in the .class file
"java.lang.UnsupportedClassVersionError: Bad version number in .class file" is a common error in Java programming language which comes when you try to run a Java class file which was compiled by different version of Java compiler than then JRE version you are using to run it. In our last article, we discussed that how to resolve Java.lang.UnSupportedClassVersionError and found that it comes when a major and minor version of the class is not supported by Java virtual machine or JRE running the program. Though "java.lang.UnsupportedClassVersionError: Bad version number in .class file" is a little different than that of its manifestation and Cause, both are related to the mismatch in compiler javac and runtime java version. 

How to Fix Must Override a Superclass Method Error Eclipse IDE Java | @Override annotation with interface methods

One of the annoying error while overriding Java method in Eclipse IDE is must override a superclass method error, This error is quite frequent when importing Java projects and after so long, still I haven't seen any permanent solution to it. Must override a superclass method the error comes in Eclipse if you have Java Class that implements interface and overrides a method from interface and uses @Override annotation. Unfortunately, Eclipse defaults to Java 1.5, which only recognize @Override annotation for the overriding method from the superclass and not from the interface.