Install Docker on Ubuntu/Linux Mint/PopOS

The official docker installation guide provides commands to install the latest Docker on Ubuntu machines but the command to add the docker repository is too specific to Ubuntu. In this article you will find a step by step guide to install the latest Docker using the official PPA on Ubuntu or any Ubuntu derivatives such as Linux Mint, Elementary OS, Pop OS, etc.

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Create Scala Project with Maven in IntelliJ Idea

Every Scala developer out there knows SBT is the default build tool for Scala but there may be some situations limiting you to stick with the famous build tool for Java: Apache Maven. Haven't come across a reason to use Maven for Scala projects yet? Keep using SBT. However, if your team decides to use Apache Maven because it works well with their CI server or because they have a well-established development environment with Apache Maven, you have no choice and this article is here to help you.
Create Scala with Maven Project in IntelliJ Idea
Creating a Scala project using Apache Maven in the command-line is easy. Just run the following command, answer the questions in the interactive shell and you are good to go. Install Apache Maven on Linux to run mvn from the terminal.
mvn archetype:generate -DarchetypeGroupId=net.alchim31.maven -DarchetypeArtifactId=scala-archetype-simple
However, why should we switch to the terminal just to create a project and then switch back to the IntelliJ Idea and import the project to continue the development? In this article, you will see how to prepare your IntelliJ Idea to create Scala projects with Apache Maven.
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Install Oracle JDK 16 on Linux

Even though OpenJDK is available in Linux repositories, some applications strictly require Oracle Java Development Kit. This article shows you how to manually install Oracle JDK $java_version on your Linux system. This article uses JDK $java_version$java_update_no to demonstrate the installation. In the provided commands, replace the version specific paths and file names according to your downloaded version.

Version specific installation guides are available here:


Install Oracle JDK $java_version on Linux

Oracle provides deb and rpm installers
If your Linux distribution is using DEB package format like Debian, you can download and install the jdk-$java_version$java_update_no_linux-x64_bin.deb file using the following command:
sudo dpkg -i jdk-$java_version$java_update_no_linux-x64_bin.deb
If your  Linux distribution is using RPM package format like Cent OS, you can download and install the jdk-$java_version$java_update_no_linux-x64_bin.rpm file using the following command:
sudo rpm -ivh jdk-$java_version$java_update_no_linux-x64_bin.rpm

However, this article explains the manual installation method which is applicable for all Linux distributions out there. Personally, I prefer the manual installation because I have more control over the changes made in the system.


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Download Files in Android - Kotlin & Java

Unless you are writing a Download Manager, downloading files in an Android application is never going to be the main business logic to solve but based on the requirement, you may need to download metafiles, media files, or documents over the Internet within your Android application. However, a reliable solution to download files in an Android application poses its own challenges including but not limited to the following list:


1. Thread Management

IO operations must be executed in a separate thread. Though there are plenty of options to achieve this such as now deprecated AsyncTask, Kotlin coroutines, or RxJava, still complex for a novice developer to properly handle the concurrency problems. Sending signals to the downloading thread to cancel or pause the download may introduce additional synchronization issues.


2. Error Handling

What if the Internet connection dropped while downloading the file? What if the application is closed while downloading/saving the file? How to handle all HTTP errors? the list goes on. Addressing all these scenarios is tedious and most of the time not possible.


3. Updating the UI

While downloading the file in a separate thread, updating a progress bar in the main thread is a challenge unless the concurrency framework you use provides an easy way. The same goes to update the UI after the file is downloaded.

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Java is Dead! Once More

Programming languages are ranked based on different criteria. For example, Stack Overflow lists programming languages based on the number of questions and answers; while it is a clear indication of the recent popularity of a language, already matured languages not necessarily require the developers to search for "how to write a loop". Similarly, the famous index Tiobe lists Java as the second most popular language next to C at the time of writing this article. Tiboe ranks programming languages based on the number of skilled engineers world-wide, courses, and third-party vendors. Popular search engines such as Google, Bing, Yahoo!, Wikipedia, Amazon, YouTube, and Baidu are used to calculate the ratings. It is important to note that the TIOBE index is not about the best programming language or the language in which most lines of code have been written.


Coming to the point, recently I saw an index claiming Python took the first place pushing Java to the second place. Nothing to worry; good for Python! The programming language war is never-ending like the Linux distribution war. Fanboys always claim that their language is superior to any other language. This article analyzes if Java is dying and is Python replacing Java so that you can learn and live with Python only. I am comparing Python against Java because of the most recent claims I've seen over the internet but the core idea remains the same for any language out there.


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Install the Latest Oracle JDK on Mac

This article shows you how to install Oracle JDK $java_version on your Mac system. This article uses JDK $java_version$java_update_no to demonstrate the installation. In the provided commands, replace the version specific paths and file names according to the downloaded version.

Oracle provides a Mac installer and a binary file.This article explains how to install Oracle JDK using the mac installer and how to set the JAVA_HOME variable.

Install Oracle JDK $java_version on Linux

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Running Docker Without Sudo on Linux

After installing Docker on Linux, you may get a permission denied message as shown below when you try to run your first docker command:

docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/create: dial unix /var/run/docker.sock: connect: permission denied.
See 'docker run --help'.

You can solve this problem by running Docker with root privileges (using sudo). However, by following these simple steps given below, you can run docker without root privileges.

Running Docker Without Sudo on Linux
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