News, Analysis and Opinion for TheServerSide

September 28, 2022 28 Sep'22

Understanding the Kubernetes Container Runtime Interface

The Kubernetes Container Runtime Interface adds options beyond Docker for container orchestration. Here's a rundown of how Kubernetes and the CRI work.

September 16, 2022 16 Sep'22

User input with a Java JOptionPane example

Java JOptionPane input example The best way to teach the concept of Java user input to new software developers is to have them use the extremely visual and highly user-friendly JOptionPane from ...

September 13, 2022 13 Sep'22

Hierarchical Kubernetes namespaces explained by example

Confused by hierarchical namespaces in Kubernetes? In this Kubernetes tutorial we'll examine what hierarchical namespaces are, how to add them to a Kubernetes cluster and then how to use them.

September 11, 2022 11 Sep'22

Java's JOptionPane showOptionDialog by Example

Don't do user input with a boring Scanner on InputStream. Use the JOptionPane. And really blow your clients away by mastering the JOptionPane's showOptionDialog method.

September 10, 2022 10 Sep'22

Java Scanner next() vs nextLine() methods: What's the difference?

What's the difference between next() and nextline()? The difference between the Java Scanner's next() and nextLine() methods is that nextLine() will return every character in a line of text, right ...

September 09, 2022 09 Sep'22

Java Exception handling best practices

Don't let the complexities of Java Exception handling get you down. Follow these top 10 Java Exception handling examples and you'll be an expert in handling errors in your Java code.

August 08, 2022 08 Aug'22

How to use Java's conditional operator ?:

Quickly learn how to use the Java ternary operator and see how this simple programming construct can help make your conditional logic, if statements and return statements more clear and concise.

August 08, 2022 08 Aug'22

Java Scanner User Input Example

This tutorial on how to use the Java Scanner for user input will quickly show you how to import java.util, take String, int, double and char input, and teach you the difference between the ...

July 24, 2022 24 Jul'22

How to format a Java String with printf example

The Java String printf method makes adding and formatting text incredibly easy. In this quick tutorial, you'll learn by example how to format, justify, pad and case output printed with Java's ...

July 23, 2022 23 Jul'22

Java Scanner String input example

Java's Scanner class provides a simple and effective way to handle user input. In this simple example, we show how to use Java's Scanner for String input with methods like next(), nextLine() and ...

July 18, 2022 18 Jul'22

How to format a Java int or long with printf example

Here's a quick tutorial on how to use printf to format Java int, long, short and byte values. It's pretty easy to do. And the output you can generate can be very visually appealing.

July 18, 2022 18 Jul'22

Java double brace initialization explained by example

Java's double brace initialization feature saves time and shaves off a few keystrokes when you initialize a Set or seed a List for testing. Here's a quick example of how to use Java's double brace ...

July 17, 2022 17 Jul'22

Java Scanner char input example without nextChar

How to add Java Scanner char support The Java Scanner class provides methods that take String input and convert that String into any Java primitive type you might need, except for one: the char. ...

July 13, 2022 13 Jul'22

Java comment types by example

There are three types of Java comments developers need to know. Here we show you how to use block, inline and JavaDoc comments with simple examples to make best practices clear.

July 10, 2022 10 Jul'22

What is a Scrum commitment?

What are the 3 Scrum commitments and why do we need them? Most importantly, Scrum commitments provide transparency and focus, but their role in Agile software development goes far beyond that.

July 08, 2022 08 Jul'22

Agile vs DevOps: What's the difference?

Wondering how to choose between Agile or DevOps? You're in luck, but it's not about DevOps versus Agile. It's about how Agile and DevOps work together. Here we examine the similarities and ...

June 13, 2022 13 Jun'22

How to format a Java double with printf example

Formatting output in Java doesn't have to be hard. Here's how to use Java printf with double values to control decimal precision, thousands groupings and character width when you format ...

June 12, 2022 12 Jun'22

How to setup the Nginx Proxy Manager Docker example

Learn how to setup and install the Nginx Proxy Manager from Docker Hub. This simple tool greatly simplifies the configuration of Nginx reverse proxy servers, asset caching, host redirecting and SSL ...

June 11, 2022 11 Jun'22

Example Java String palindrome checker program using recursion

There are many ways to write a Java String palindrome program. In this Java palindrome example we demonstrate recursion and how the use of loops, arrays, Scanner and the reverse method can improve ...

June 10, 2022 10 Jun'22

How to git push an existing project to Bitbucket

Follow these simple steps to push an existing project to a Bitbucket repo, and successfully add all of the code on your local machine into a remote Bitbucket repository.

June 10, 2022 10 Jun'22

Java array size, length and loop examples

How do you find the size of a Java array? How do you size Java arrays when you create them? And is the Java array size fixed? Here we answer all of your questions about the size of a Java array.

June 10, 2022 10 Jun'22

How do I install Java?

To install Java the right way, there are a few things to know. Just sort out the perquisites and you'll be able to install Java and the JDK in no time flat.

June 09, 2022 09 Jun'22

How do I find the Java array length?

How do you find the size of an array in Java? Just use the array length property. But there are some 'gotchas' to be aware of. Read this Java array length tutorial and stay clear of runtime errors ...

June 09, 2022 09 Jun'22

How do I find the Java String length?

The need to find the length of a Java String is a common programming requirement. Learn how to get the size of a Java String and avoid lengthy errors developers often encounter.

June 09, 2022 09 Jun'22

Java length vs length(): What's the difference?

Have you ever been confused between length and length() in Java? Here we show you the difference between Java length properties and methods, and when to use them in your code.

June 09, 2022 09 Jun'22

How to run a Jar file

How do you run a JAR file on Windows, Mac or Linux? Double click the JAR? Run the JAR at the command line? Several approaches will work if you have Java or the JDK installed.

June 08, 2022 08 Jun'22

Fix the 'expected a step' Jenkins error

Have you encountered the 'expected a step' error in Jenkins? Are you using a declarative pipeline? Here's the most likely way to fix the 'expected a step' error in Jenkins.

June 08, 2022 08 Jun'22

'Java Not Recognized' Error Fix

Here are three easy ways to fix the 'Java not recognized as an external or external command' error on both Windows and Linux machines.

June 07, 2022 07 Jun'22

The best Jar file opener app

There are many Java JAR file openers available on the market today. Here are the top 5 JAR file openers for both Java developers and casual users to install on their Windows or Linux machines.

June 07, 2022 07 Jun'22

How to open a JAR file

You can open JAR files with any ZIP utility. A JAR file is just a special type of ZIP file. And to run a Java JAR file, just install Java and either double-click it or run the JAR file at the ...

June 06, 2022 06 Jun'22

How to setup a Docker Nginx reverse proxy server example

The ability to put an Nginx reverse proxy in a Docker container greatly simplifies enterprise architectures. Here's how easy it is to setup and configure an Nginx reverse proxy Docker image and ...

June 04, 2022 04 Jun'22

How to install Docker and docker compose on Ubuntu

Modern day development happens in containers. Which is why it's imperative that you know how to setup and install Docker and docker compose on your local Ubuntu workstation. In this tutorial, we'll ...

June 01, 2022 01 Jun'22

How do I install Java on Ubuntu?

Here's the easiest way to install Java on Ubuntu with apt. Follow these steps and you'll get the JDK installed in no time, and be ready to use your Java on Ubuntu setup right away.

June 01, 2022 01 Jun'22

How do I install Java on Windows?

To install Java on Windows you only need to follow these five simple steps. In this quick tutorial, we'll show you how to setup Java on Windows and run apps like Minecraft and Apache Tomcat on the JDK.

May 31, 2022 31 May'22

How to create a database schema in MySQL

Want to work with MySQL databases using Java? Here's a quick walkthrough of the first step to do that: create a schema.

May 31, 2022 31 May'22

How should developers approach professional development?

There's a joke that goes like this: A doctor takes his Mercedes in for a brake job. When he picks up the vehicle the next day, the mechanic presents him with a bill for $2000. "Two thousand dollars ...

May 31, 2022 31 May'22

How to write an Agile user story

Agile user stories describe software project requirements as needed by different end users. Follow these guidelines to translate user needs into product features and business value.

May 30, 2022 30 May'22

How to git push an existing project to GitLab

Steps to push an existing project to GitLab Follow these steps to add and import a new project into an existing GitLab repository: Create a GitLab repository for the current project. Copy the ...

May 29, 2022 29 May'22

Create a Bitbucket App Password example

Learn how to quickly create a Bitbucket App Password so your Git push and clone operations don't fail with fatal 'invalid credentials for authentication' errors.

May 28, 2022 28 May'22

How to setup an Nginx reverse proxy server example

Here's a quick tutorial to setup an Nginx reverse proxy server. This example uses an Apache Tomcat server but the config settings apply for other backend app servers such as Node, Express, ...

May 28, 2022 28 May'22

How to git push an existing project to GitHub

If you stared development before version control was set up, you may need to push your development project to an existing GitHub repo. This Git and GitHub example will show you the fastest way to ...

May 27, 2022 27 May'22

How to setup PHP on Nginx with fastCGI (PHP-FPM) example

Here's a quick tutorial on how to setup Nginx with PHP support. The key? The installation of fastCGI, aka PHP-FPM, so Nginx can serve PHP files to clients.

May 24, 2022 24 May'22

Create a GitHub Personal Access Token example

This walkthrough shows how to generate a GitHub personal access token, and use the GitHub personal access token to clone, pull, fetch and push changes back to your GitHub repository.

May 24, 2022 24 May'22

How to customize Git Bash Shell prompt settings

Want to style and customize your user and hostname properties that display in the Git Bash prompt? This quick example shows you how to quickly customize your Git Bash terminal window.

May 22, 2022 22 May'22

Columns vs rows: What's the difference?

Learn the difference between columns vs rows, and learn how the use of rows and columns to organize objects and information in spreadsheets and tables has improved various fields from data ...

May 20, 2022 20 May'22

Docker run vs docker-compose: What's the difference?

Both docker run and docker-compose can be used to start Docker containers, but there are key differences between the two. Here we explore the differences between docker-compose and docker run, and ...

May 19, 2022 19 May'22

Git commit config and credential confusion causes consternation for customers

A user who accidentally provides a GitHub username and password instead of the Git username and email address may have inadvertently published their security credentials to the world.

May 18, 2022 18 May'22

Dockerfile vs docker-compose: What's the difference?

What's the difference between Dockerfile and docker-compose? These simple examples compare Dockerfile, the docker-compose.yaml file and important commands to build Docker images and run Docker ...

May 17, 2022 17 May'22

How to setup an Apache reverse proxy server example

Most enterprise architectures use Apache as a reverse proxy, but it is not configured for that by default. In this quick tutorial, we show you how to configure an Apache reverse proxy for backend ...

May 17, 2022 17 May'22

How to use docker-compose with Apache httpd example

Want to configure and run an Apache httpd Docker container to serve website files from a local system? This example shows the best way to do that, using the "docker-compose" command and YAML file.

May 17, 2022 17 May'22

Deploy your website with a Docker Apache httpd container volume

The best way to run Docker's httpd Apache web server image is to map a volume that points to local files on your hard drive. This example shows you how to run Apache in Docker without the need to ...

May 17, 2022 17 May'22

How to dockerize Apache httpd websites example

Need to dockerize Apache? Want to build a custom Docker httpd image that hosts your website? Here's a simple Apache Dockerfile example to build a custom httpd Docker image for your website.

May 09, 2022 09 May'22

Imperative vs. declarative Kubernetes commands: What's the difference?

Imperative and declarative Kubernetes commands are the two different ways to configure the state of your clustered environment. Here we compare declarative versus imperative commands and show you ...

February 14, 2022 14 Feb'22

Noon is not 12am. Midnight is not 12pm. Code appropriately.

The terms 12am and 12pm make no logical sense. Neither one is noon or midnight. Remove the 12am vernacular from your applications. Users will thank you.

February 08, 2022 08 Feb'22

How to convert a PEM file to PPK format example

Need to SSH into a remote server with PuTTY but your PEM file just won do the trick? Here's a quick example of how to convert a PEM file to PPK format with PuTTYGen so your SSH sessions with PuTTY ...

February 07, 2022 07 Feb'22

Node.js file upload example with Ajax and JavaScript

The Node.js file upload process is made easy with libraries like 'fs' and 'formidable.' In this JavaScript and Node.js file upload example, we show you how to move files from the browser to the ...

January 26, 2022 26 Jan'22

How to create an AWS account alias

Need to create, change or rename an AWS account alias? It's not too hard to do, and your users will thank you. Here are the steps to do it.

January 25, 2022 25 Jan'22

Why is the Bootstrap grid system 12 columns wide?

Ever wonder why they created a 12-column Bootstrap grid system, and not 10 or 15? It's the same reason there's 60 seconds in a minute, or 360 degrees in a circle.

January 23, 2022 23 Jan'22

Comparing Rest vs GraphQL on performance and ease of use

The problem with RESTful web services that use JSON or XML as a data exchange is bloat and verbosity. Compare REST vs GraphQL performance if you want to simplify your web API development.

January 21, 2022 21 Jan'22

Why we use ./ (dot slash) to run Linux scripts?

Ever wonder why you need a ./ before a Unix shell script or command of your own in order to run it? Here's what the Linux dot slash does and why Unix systems require the ./ syntax.

January 21, 2022 21 Jan'22

Fix Apache's 'ServerRoot Must be a Valid Directory' error quickly

Here are three easy ways to fix Apache's ServerRoot Must be a Valid Directory error. Any of these remedies will get your Apache HTTP server running again.

January 19, 2022 19 Jan'22

Principle of least privilege examples & best practices

We see examples of the principle of least privilege everywhere in our daily lives. What does the principle of least privilege mean as applied to security in software development and DevOps?

January 16, 2022 16 Jan'22

Quickly set up GitHub SSH example

Here's a very quick example of how to setup GitHub SSH keys and use them to perform Git clone, push and pull commands over a securely configured SSH connection.

January 15, 2022 15 Jan'22

How to install Apache's Web Server on Windows 10 quickly

Let me step you though the installation of Apache's Web Server on Windows 10. You'll learn how to install Apache 2.4 on Windows, and avoid common httpd config errors.

January 14, 2022 14 Jan'22

Top 5 AWS root account best practices

The credentials of your server's super user must be protected at all costs. Here are five AWS root account best practices to protect yourself from being hacked.

January 14, 2022 14 Jan'22

BitBucket SSH key generation tutorial

This simple and straight-forward example shows you how to quickly configure BitBucket SSH keys, so you can connect Git to BitBucket with a secure shell (SSH).

January 14, 2022 14 Jan'22

How to create and run a shell script in Linux and Ubuntu

It's not hard to create and run a shell script in Linux distros like Ubuntu, but there are a few non-obvious pitfalls you need to avoid. Here's a quick example of how to execute a script in Linux.

January 13, 2022 13 Jan'22

Git securely with a GitHub SSH URL example

Where do you find the GitHub SSH URL? How do you use it to clone or pull from your remote GitHub repository? This quick Git tutorial shows you everything you need to know about the GitHub SSH URL.

January 12, 2022 12 Jan'22

Quick GitHub 'Permission denied (publickey)' SSH error fix

Here are the three most common fixes to the GitHub 'Permission denied (publickey)' error over SSH.

January 11, 2022 11 Jan'22

A quick GitLab SSH key configuration example

To connect Git operations securely to your GitLab repository, you will need to configure GitLab SSH keys both locally and remotely. Here's a quick example of how to do it.

January 11, 2022 11 Jan'22

How to SSH into GitHub on Windows example

Here's a quick tutorial to connect to GitHub with SSH on Windows. It's easy, and you'll establish a GitHub SSH Windows connection with Git in no time.

January 11, 2022 11 Jan'22

A quick GitHub SSH clone example

Here's a quick example of how to perform a GitHub SSH clone operation. In just five minutes, learn how to create SSH keys, configure them in GitHub and perform the GitHub clone with SSH keys in Git.

January 08, 2022 08 Jan'22

How chmod numbers work explained by example

Don't let yourself be intimidated by chmod numbers and permissions. Here's a quick and easy to understand explanation of how chmod permission numbers work in Linux.

January 05, 2022 05 Jan'22

Was GitHub's password authentication removal an overstep?

Was GitHub's removal of password based authentication a security overstep? If it makes it harder for developers to get started with Git and GitHub, it was.

January 02, 2022 02 Jan'22

Git and GitHub SSH KeyGen by Example

Here's a quick example of how to securely connect Git to GitHub with SSH KeyGen produced secure shell keys on both Windows and Linux.

December 31, 2021 31 Dec'21

How to quickly change your branch in Git

These Git branch change examples will help you quickly address the specific version control challenge you are trying to solve, be it a branch renaming or a switch, list and checkout of existing ...

December 29, 2021 29 Dec'21

Fix Putty's 'Key Exchange Algorithm Agreement' error

Ever encounter the 'Couldn't Agree a Key Exchange Algorithm' error when you fail to connect with Putty to an AWS EC2 instance or other server-side resource? This is the first fix you should try.

December 28, 2021 28 Dec'21

Spring Boot file upload example with Ajax

Do you need to find a Spring Boot file upload that uses Ajax and works with Spring MVC web apps? This example uses HTML5 file input fields and a pure JavaScript Ajax call to accomplish the task.

December 25, 2021 25 Dec'21

Simple Struts 2 file upload example

In this Struts 2 file upload example we show you to take a local resource and upload it to a remote Java application server. All a developer needs is a file, a browser and an Internet connection ...

December 24, 2021 24 Dec'21

Create an HTML5 and PHP file upload form for Apache example

It's easier than ever for a developer to upload a file with PHP and HTML5 to an Apache web server. This example shows how to create an HTML and PHP file upload component that will work in any ...

December 23, 2021 23 Dec'21

Java file upload by example with Servlets & JSPs

It's not that hard to perform Java file uploads. The new Servlet and JSP API, along with HTML5 input form enhancements, make Java file uploads, both synchronously and asynchronously with Ajax, ...

November 29, 2021 29 Nov'21

Kubernetes vs Docker Compose: What's the difference?

Confused between the difference between Kubernetes and Docker compose? Here we explain how the two DevOps construct are similar, and how they are different.

November 29, 2021 29 Nov'21

How to delete a Git repository

Trying to delete a local Git repository but the DVCS system still persists? Here's a quick example of how to locally remove a Git repo permanently and completely.

November 29, 2021 29 Nov'21

How to use jarsigner to sign JARs files example

Here's a quick example of how to use Java's jarsigner to digitially sign JAR files.

November 29, 2021 29 Nov'21

How to use Java's javap tool by example

Need to disassemble a Java class file? Want to look at the bytecode instructions generated from compiling source? These javap tool examples will show you how to use the javap command properly.

November 29, 2021 29 Nov'21

How to import a Maven project from GitHub into Eclipse

Here's a quick tutorial that shows you how to import a GitHub hosted Maven project into the Eclipse IDE.

November 29, 2021 29 Nov'21

What is the difference between Docker and containerd?

What's the difference between containerd and Docker? Here we take a look at how these two cloud-native Kubernetes friendly technologies differ and compare.

November 29, 2021 29 Nov'21

The 5 things devs should know about the Jakarta Servlet 6.0 API release

Jakarta EE 10 includes a full increment release of the Servlet API. Here are the top 5 features Java devs will enjoy when the Jakarta Servlet 6.0 API arrives.

November 29, 2021 29 Nov'21

What is the difference between kubectl and kubelet in Kubernetes?

Are you working in a cloud-native, Docker and Kubernetes based environment and you're wondering what the difference is between kubelet and kubectl? Here we clear up the kubectl vs kubelet confusion.

November 02, 2021 02 Nov'21

How to delete all Git branches except master or main exampleb

Here is a quick Git command to delete all branches except master or main from your local repository. It's a nice way to clean up your workspace after a milestone or a sprint.

October 31, 2021 31 Oct'21

What is the difference between a Docker image vs a container?

Wondering what the difference is between a Docker image and container? Here we make the Docker container vs image comparision and show you how the two concepts differ.

October 31, 2021 31 Oct'21

Uncommit Git's Last Commit Example

Need to do a git uncommit to the last commit you were working on? Learn how to quickly uncommit files updates and changes in Git.

October 28, 2021 28 Oct'21

How to fully delete remote Git branches from GitHub

Learn the command to properly delete remote Git branches from tools such as GitHub and GitLab, while also deleting local remote tracking branches as well.

October 25, 2021 25 Oct'21

Fix Git's "fatal: no upstream branch" error quickly example

Here's a quick fix for Git's "fatal: The current branch has no upstream branch" error, along with a brief explanation of why this happens when you push a new Git branch to GitHub, GitLab or BitBucket.

October 23, 2021 23 Oct'21

How to discard your local changes in Git example

Don't let a file or two be overlooked when you attempt to remove and discard local, uncommitted changes in Git. Learn how to locally revert and remove uncommitted changes to files in Git properly.

October 22, 2021 22 Oct'21

How to remove Git branches from your repository

Need to permanently remove a Git branch locally? What about the remote tracking branch? Or maybe someone removed a Git branch on GitHub or GitLab and you need to synchronize with the server? Here ...

October 13, 2021 13 Oct'21

How to rename and change a Git branch name locally & remotely

Here's a quick example that shows you how to rename a Git branch locally and remotely. The branch renaming commands and techniques will work with GitHub, GitLab, Bitbucket and any cloud based Git ...

October 11, 2021 11 Oct'21

4 ways to create a Git branch quickly by example

Forgotten the Git branch create command? Here we'l show you four different ways to create a Git branch, be it from the current branch, from a tag or from a commit id.

October 10, 2021 10 Oct'21

How to delete a Git branch locally

Here's a quick example of how to delete local Git branches from your workstation without deleting remote branches in your GitHub or GitLab repos.

October 06, 2021 06 Oct'21

How to tag a Git commit id by example

Here's a quick example of how to tag a specific commit id in Git. This is perfect if an older commit id requires a tag but was not originally given one.