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Coffee Talk: Java, News, Stories and Opinions
Community driven content discussing all aspects of software development from DevOps to design patterns.
Recent Posts
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How to format a Java double with printf example
- TechTarget 13 Jun 2022 -
How to setup the Nginx Proxy Manager Docker example
- TechTarget 12 Jun 2022 -
Example Java String palindrome checker program using recursion
- TechTarget 11 Jun 2022
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 ...
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 ...
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 ...
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How to git push an existing project to Bitbucket
- TechTarget 10 Jun 2022 -
Java array size, length and loop examples
- TechTarget 10 Jun 2022 -
How do I install Java?
- TechTarget 10 Jun 2022 -
How do I find the Java array length?
- TechTarget 09 Jun 2022 -
How do I find the Java String length?
- TechTarget 09 Jun 2022 -
Java length vs length(): What's the difference?
- TechTarget 09 Jun 2022 -
How to run a Jar file
- TechTarget 09 Jun 2022
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.
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.
To install Java the right way, there are a few things to know. Just get the perquisites sorted out and you'll be able to install Java and the JDK in no time flat.
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 ...
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 run into.
Have you ever got 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.
How do you run a JAR file? Several approaches will work if you have Java or the JDK installed. Double click the JAR? Run the JAR at the command line? There are many ways to run Java JAR files on ...
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Fix the 'expected a step' Jenkins error
- TechTarget 08 Jun 2022 -
'Java Not Recognized' Error Fix
- TechTarget 08 Jun 2022 -
The best Jar file opener app
- TechTarget 07 Jun 2022 -
How to open a JAR file
- TechTarget 07 Jun 2022 -
How to setup a Docker Nginx reverse proxy server example
- TechTarget 06 Jun 2022 -
How do I 'docker copy' a file from container to host?
- TechTarget 05 Jun 2022 -
How to setup an Nginx load balancer example
- TechTarget 05 Jun 2022 -
How to install Docker and docker compose on Ubuntu
- TechTarget 04 Jun 2022 -
How do I install Java on Ubuntu?
- TechTarget 01 Jun 2022 -
How do I install Java on Windows?
- TechTarget 01 Jun 2022 -
How to create a database schema in MySQL
- TechTarget 31 May 2022 -
How can business leaders and IT improve communication?
31 May 2022 -
How should developers approach professional development?
31 May 2022 -
How to write an Agile user story
- TechTarget 31 May 2022 -
What should developers know about machine learning?
31 May 2022 -
How to git push an existing project to GitLab
- TechTarget 30 May 2022 -
Create a Bitbucket App Password example
- TechTarget 29 May 2022 -
How to setup an Nginx reverse proxy server example
- TechTarget 28 May 2022 -
How to git push an existing project to GitHub
- TechTarget 28 May 2022 -
How to setup PHP on Nginx with fastCGI (PHP-FPM) example
- TechTarget 27 May 2022 -
Create a GitHub Personal Access Token example
- TechTarget 24 May 2022 -
How to customize Git Bash Shell prompt settings
- TechTarget 24 May 2022 -
Columns vs rows: What's the difference?
- TechTarget 22 May 2022 -
Docker run vs docker-compose: What's the difference?
- TechTarget 20 May 2022 -
Git commit config and credential confusion causes consternation for customers
- TechTarget 19 May 2022 -
Dockerfile vs docker-compose: What's the difference?
- TechTarget 18 May 2022 -
How to setup an Apache reverse proxy server example
- TechTarget 17 May 2022 -
How to use docker-compose with Apache httpd example
- TechTarget 17 May 2022 -
Deploy your website with a Docker Apache httpd container volume
- TechTarget 17 May 2022 -
How to dockerize Apache httpd websites example
- TechTarget 17 May 2022 -
Imperative vs. declarative Kubernetes commands: What's the difference?
09 May 2022 -
CDI Full vs CDI Lite: What's new in Contexts and Dependency Injection 4.0
20 Apr 2022 -
Hibernate 6.0 release marks a milestone for JPA 3.x development
19 Apr 2022 -
Being Agile vs. doing Agile: What's the difference?
- Scrumtuous Inc. 18 Apr 2022 -
Top 5 best Scrum Master certifications of today
- Scrumtuous Inc. 19 Mar 2022 -
Noon is not 12am. Midnight is not 12pm. Code appropriately.
- TechTarget 14 Feb 2022 -
How to convert a PEM file to PPK format example
- TechTarget 08 Feb 2022 -
Node.js file upload example with Ajax and JavaScript
- TechTarget 07 Feb 2022 -
How to create an AWS account alias
- TechTarget 26 Jan 2022 -
Lessons learned from the Log4j vulnerability
25 Jan 2022 -
Why is the Bootstrap grid system 12 columns wide?
- TechTarget 25 Jan 2022 -
Comparing Rest vs GraphQL on performance and ease of use
23 Jan 2022 -
Why we use ./ (dot slash) to run Linux scripts?
- TechTarget 21 Jan 2022 -
Fix Apache's 'ServerRoot Must be a Valid Directory' error quickly
- TechTarget 21 Jan 2022 -
Principle of least privilege examples & best practices
- TechTarget 19 Jan 2022 -
Quickly set up GitHub SSH example
- TechTarget 16 Jan 2022 -
How to install Apache's Web Server on Windows 10 quickly
- TechTarget 15 Jan 2022 -
Top 5 AWS root account best practices
- TechTarget 14 Jan 2022 -
BitBucket SSH key generation tutorial
- TechTarget 14 Jan 2022 -
How to create and run a shell script in Linux and Ubuntu
- TechTarget 14 Jan 2022 -
Git securely with a GitHub SSH URL example
- TechTarget 13 Jan 2022 -
Quick GitHub 'Permission denied (publickey)' SSH error fix
- TechTarget 12 Jan 2022 -
A quick GitLab SSH key configuration example
- TechTarget 11 Jan 2022 -
How to SSH into GitHub on Windows example
- TechTarget 11 Jan 2022 -
A quick GitHub SSH clone example
- TechTarget 11 Jan 2022 -
How chmod numbers work explained by example
- TechTarget 08 Jan 2022 -
Was GitHub's password authentication removal an overstep?
- TechTarget 05 Jan 2022 -
Git and GitHub SSH KeyGen by Example
- TechTarget 02 Jan 2022 -
The psychology of offering developers programming advice
31 Dec 2021 -
How to quickly change your branch in Git
- TechTarget 31 Dec 2021 -
Fix Putty's 'Key Exchange Algorithm Agreement' error
- TechTarget 29 Dec 2021 -
Spring Boot file upload example with Ajax
- TechTarget 28 Dec 2021 -
Simple Ajax file upload with pure JavaScript example
- TechTarget 27 Dec 2021 -
Simple Struts 2 file upload example
- TechTarget 25 Dec 2021 -
Create an HTML5 and PHP file upload form for Apache example
- TechTarget 24 Dec 2021 -
Java file upload by example with Servlets & JSPs
- TechTarget 23 Dec 2021 -
Learn how Kubernetes Operators work from this example
06 Dec 2021 -
How to find and use a GitHub URL by example
- TechTarget 01 Dec 2021 -
Top 5 things to know about the Jakarta Servlet 6.0 API release
29 Nov 2021 -
Kubernetes vs Docker Compose: What's the difference?
29 Nov 2021 -
How to delete a Git repository
- TechTarget 29 Nov 2021 -
How to use jarsigner to sign JARs files example
- TechTarget 29 Nov 2021 -
How to use Java's javap tool by example
- TechTarget 29 Nov 2021 -
How to import a Maven project from GitHub into Eclipse
- TechTarget 29 Nov 2021 -
What is the difference between Docker and containerd?
29 Nov 2021 -
The 5 things devs should know about the Jakarta Servlet 6.0 API release
- TechTarget 29 Nov 2021 -
What is the difference between kubectl and kubelet in Kubernetes?
29 Nov 2021 -
How to delete all Git branches except master or main exampleb
- TechTarget 02 Nov 2021 -
What is the difference between a Docker image vs a container?
31 Oct 2021 -
Uncommit Git's Last Commit Example
- TechTarget 31 Oct 2021 -
How to fully delete remote Git branches from GitHub
- TechTarget 28 Oct 2021 -
Fix Git's "fatal: no upstream branch" error quickly example
- TechTarget 25 Oct 2021 -
How to discard your local changes in Git example
- TechTarget 23 Oct 2021 -
How to remove Git branches from your repository
- TechTarget 22 Oct 2021 -
How to rename and change a Git branch name locally & remotely
- TechTarget 13 Oct 2021 -
4 ways to create a Git branch quickly by example
- TechTarget 11 Oct 2021 -
How to delete a Git branch locally
- TechTarget 10 Oct 2021 -
How to tag a Git commit id by example
- TechTarget 06 Oct 2021 -
How to push new Git branches to remote repos on GitHub or GitLab by example
- TechTarget 03 Oct 2021 -
Create a new Git branch with current local changes saved by example
- TechTarget 02 Oct 2021
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.
Here are three easy ways to fix the 'Java not recognized as an external or external command' error on both Windows and Linux machines.
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.
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 ...
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 ...
Here's a quick example of how to copy a file inside a Docker container to the local filesystem of the host machine. With the ID or name of the container in hand, a Docker file copy operation is an ...
Nginx is the most popular load balancers and reverse proxy servers in existence. Here's how to quickly setup Nginx as a load balancer and configure weighted nodes and sticky sessions.
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 ...
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 your Java on Ubuntu setup will be ready to use right away!
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.
Want to work with MySQL databases using Java? Here's a quick walkthrough of the first step to do that: create a schema.
The days when companies could afford to treat IT as simply the department that keeps the computers running are long gone. Technology delivers massive value to business leaders. Business ...
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 ...
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.
As artificial intelligence and machine learning become increasingly important in the world of enterprise development, programmers need to know the ins and outs of AI and ML.
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 ...
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.
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, ...
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 ...
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.
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.
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.
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 ...
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 ...
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.
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 ...
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 ...
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.
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 ...
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.
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 ...
There's an interesting change packaged inside the CDI 4.0 release that will change the way you think about the API. Version 4.0 of Jakarta Contexts and Dependency Injection (CDI) changed the ...
Hibernate 6.0 has finally been released. Here's what this full increment release means for developers who use JPA for persistence.
What's the difference between being Agile and doing Agile? It's subtle, but it's significant. Here we compare them and show you how to both be Agile and do Agile the right way.
Whether you are hiring for a career position or just trying to build your resume, this list of the top 5 best professional Scum Master certifications to have will provide you insights on the skills ...
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.
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 ...
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 ...
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.
The Log4j 2 vulnerability was a black eye for the Java community. Here's how to protect yourself today, and how the community can protect itself in the future.
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.
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.
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.
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.
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?
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.
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.
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.
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).
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.
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.
Here are the three most common fixes to the GitHub 'Permission denied (publickey)' error over SSH.
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.
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.
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.
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.
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.
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.
Need to provide programming advice, or perhaps even harsh criticisms to a team of developers? Here's a nice way, pyscyhologically sound, way to do it.
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 ...
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.
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.
Do you need to perform an Ajax file upload with pure JavaScript? This example lays out the steps to accomplish an Ajax file upload without the need for a JavaScript library like jQuery or Dojo.
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 ...
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 ...
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, ...
Kubernetes (K8S) has become a very popular technology for working with distributed applications that run on the internet. K8S is intended to support an enormously large number of Linux containers ...
This example shows you how you can find and use the GitHub URL. Clone, fetch, push and pull to your remote repo easily with the GitHub URL at your disposal.
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.
Confused between the difference between Kubernetes and Docker compose? Here we explain how the two DevOps construct are similar, and how they are different.
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.
Here's a quick example of how to use Java's jarsigner to digitially sign JAR files.
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.
Here's a quick tutorial that shows you how to import a GitHub hosted Maven project into the Eclipse IDE.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 ...
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 ...
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.
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.
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.
Did you create a new Git branch? Need to push that new Git branch to a remote repo such as GitHub or GitLab? This Git example tutorial shows you how to push new branches to remotes.
Did you update some code in the wrong Git branch? Here's how to save those local changes in a newly created Git branch, and clean up the original branch in the process.