Modular code
Learn about modular code in this section, including information and resources on modular code tools, restful Web services, Web services specification, Web portal testing, Java server faces and server pages, servlet Java, modular containers and programming code. Also, find there is news and tips on code troubleshooting, Java and JVM performance tuning, software languages, UI patterns and Spring framework. Find expert advice, podcasts and tutorials on a variety of subjects in this section.
Top Stories
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Feature
21 Sep 2022
Forward proxy vs. reverse proxy: What's the difference?
Forward and reverse proxies secure and isolate resources that reside on a private network, but they play different roles in modern enterprise architectures. Continue Reading
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Tutorial
30 Mar 2022
An example of how suppressed exceptions in Java work
Don't ignore suppressed exceptions. In this quick tutorial we show you how to anticipate when code will throw suppressed exceptions, along with the best practices to handle them. Continue Reading
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Blog Post
28 Sep 2022
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. Continue Reading
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Feature
21 Sep 2022
Forward proxy vs. reverse proxy: What's the difference?
Forward and reverse proxies secure and isolate resources that reside on a private network, but they play different roles in modern enterprise architectures. Continue Reading
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Blog Post
12 Jun 2022
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 ... Continue Reading
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Blog Post
11 Jun 2022
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 ... Continue Reading
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Blog Post
05 Jun 2022
How do I 'docker copy' a file from container to host?
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 ... Continue Reading
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Blog Post
20 May 2022
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 ... Continue Reading
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Blog Post
18 May 2022
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 ... Continue Reading
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Blog Post
17 May 2022
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. Continue Reading
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Blog Post
17 May 2022
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. Continue Reading
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Blog Post
09 May 2022
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 ... Continue Reading
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Blog Post
19 Apr 2022
Hibernate 6.0 release marks a milestone for JPA 3.x development
Hibernate 6.0 has finally been released. Here's what this full increment release means for developers who use JPA for persistence. Continue Reading
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Tutorial
30 Mar 2022
An example of how suppressed exceptions in Java work
Don't ignore suppressed exceptions. In this quick tutorial we show you how to anticipate when code will throw suppressed exceptions, along with the best practices to handle them. Continue Reading
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Blog Post
27 Dec 2021
Simple Ajax file upload with pure JavaScript example
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. Continue Reading
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Blog Post
24 Dec 2021
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 ... Continue Reading
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Blog Post
23 Dec 2021
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, ... Continue Reading
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Quiz
10 Dec 2021
A 12-factor app principles quiz for cloud-native developers
The 12-factor app principles are a must for those who perform cloud-native development. Try your hand at this 12-factor quiz to test your knowledge on the fundamentals. Continue Reading
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Blog Post
31 Oct 2021
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. Continue Reading
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Quiz
08 Sep 2021
A monolithic vs. cloud-native migration quiz for developers
Are you prepared for a cloud-native migration? This quiz contrasts the microservice vs. monolithic approaches to software development and will help gauge your knowledge. Continue Reading
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Blog Post
31 Aug 2021
When to you Docker vs Podman? A developer's perspective
Docker and Podman play two very separate and distinct roles in the modern DevOps pipeline. Here we compare Docker and Podman and show you how to choose which one is best for you. Continue Reading
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Blog Post
31 Aug 2021
Docker versus Virtual Machines: Which DevOps tool is best?
Forced to choose between Docker and a virtual machine, which one should a developer choose. Here we compare and contrast the two DevOps tools and let you know which one is best to use. Continue Reading
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Feature
06 Aug 2021
How to build a Spring Boot 12-Factor app
Here we look at how the Spring Boot framework supports the Twelve-Factor App methodology, and where tools such as GitHub, Docker and Kubernetes fill in the voids. Continue Reading
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News
26 Mar 2021
Genuitec's CodeTogether 4.0 promotes pair programming
With Genuitec CodeTogether 4.0, development teams can work collaboratively even when remote. The product supports pair programming, mob programming and swarm programming. Continue Reading
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Video
20 Oct 2020
An example of how to use the git stash command
Developers must occasionally pivot quickly from one task to another. Git stash is a simple command that lets you temporarily shelve changes and hold your place for when it's time to return to your original task. Continue Reading
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Feature
30 Sep 2020
Is Apache Tomcat the right Java application server for you?
What is the best application server? The answer depends on what an enterprise is looking for. Compare Apache Tomcat to these four offerings to see which Java app server fits. Continue Reading
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Video
02 Sep 2020
How to git stash untracked files with a push
Need to add untracked files and otherwise ignored files into the git stash? Here's how to use the --include-untracked and --all git stash push options. Continue Reading
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Tutorial
25 Aug 2020
WebAssembly Hub boosts Envoy filter development
Examine WebAssembly Hub's features, why developers have turned to the portal to share Envoy filters and how it seems to be built for the long haul. Continue Reading
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Blog Post
03 Aug 2020
WildFly vs. JBoss EAP: What's the difference?
What's the difference between WildFly and JBoss EAP? That answer is 'not much.' But there are a few differentiating factors in the WildFly vs. JBoss debate you should be aware of. Continue Reading
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Video
30 Jul 2020
Tomcat vs. JBoss: Compare features of these Java app servers
How do Apache Tomcat and RedHat's JBoss EAP server compare? Evaluate the features of each application server to find the one that makes sense for your enterprise. Continue Reading
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Feature
28 Jul 2020
Reduced cost, responsive apps from micro front-end architecture
Micro front-end development has grown in prominence though has not yet found its footing in the enterprise. Learn more about micro front ends and consider some potential pros and cons. Continue Reading
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Podcast
27 Jul 2020
How Quarkus fits into the Red Hat Runtimes formula
Faster microservices runtimes are the center of the excitement around Quarkus. Hear what Red Hat's James Falkner thinks about the framework in this podcast with TheServerSide.com. Continue Reading
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Video
20 Jul 2020
How to easily merge and resolve git stash pop conflicts
Don't let a conflict with git stash pop derail development. Here's how to merge and resolve this issue and clean up code for proper programming. Continue Reading
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Video
15 Jun 2020
Compare git stash pop and git stash apply for file restores
Do you want to save or delete your stash entries? Your choice will determine the outcome of the debate between the git stash pop and git stash apply command. Continue Reading
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Video
11 May 2020
The Git working tree, index and commit history explained by example
This quick tutorial explains the importance of the Git working tree. With the help of the git status command, you'll become an expert on how the popular DVCS tool transforms the file system. Continue Reading
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Blog Post
30 Apr 2020
How to fix the 'HttpServlet not found' error in Eclipse
Have you run into the HttpServlet not found error? This tutorial will show you how to quickly fix this annoying Eclipse error message in three easy steps. Continue Reading
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Video
30 Apr 2020
How to change the last Git commit message quickly
How can a developer change the message associated with the last git commit before an update? Use the following tutorial on the amend command to alter the last Git commit message. Continue Reading
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Blog Post
29 Apr 2020
Tomcat vs WebSphere: How these application servers compare
When it comes to Java application server comparisons, there isn't a starker contrast between two offerings than Apache Tomcat and IBM WebSphere. Right off the bat, let's clear up some ... Continue Reading
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Blog Post
30 Mar 2020
How to go beyond Docker with WebAssembly on the server-side
Docker changed the way services and applications are designed, implemented and deployed. Before Docker, applications and services had to work cooperatively on the same machine. Sometimes they did, ... Continue Reading
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Video
31 Jan 2020
How to create a local repository with the git init command
Follow this git init tutorial to create a local repository, add files to the repository and perform commits on your local machine as you get started with distributed version control. Continue Reading
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Video
31 Jan 2020
How to use the git remote add origin command to push remotely
Need to connect your local Git repository to a remote one? The git remote add command can make it happen. Developers call on it to push to GitHub and other cloud-based tools. Continue Reading
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Video
31 Jan 2020
Install Eclipse IDE on Ubuntu in 5 easy steps
Software development is greatly simplified by an IDE, like Eclipse. In this video tutorial, we demonstrate how to install the Eclipse IDE on the Ubuntu distribution of Linux. Continue Reading
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Video
06 Jan 2020
Simplify a cloud-native, Spring Boot Docker deployment
How do you deploy a Spring Boot application to Docker? It's not as complicated as you might think. Follow this example to move and test your app within a container. Continue Reading
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Blog Post
30 Dec 2019
TheServerSide's top articles from 2019
From Git to the speed of the OpenJDK, here's a look at some of the most popular topics of 2019 on TheServerSide.com. Continue Reading
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Blog Post
18 Dec 2019
How to deploy a WAR file to Tomcat 5 different ways
Tomcat WAR deployment example If you want to develop web applications and Apache Tomcat is your target web server, you need to know how to deploy WAR files to Tomcat so you can see if your ... Continue Reading
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Video
26 Nov 2019
Tomcat vs. Jetty: How these Java application servers compare and differ
What is your Java application server of choice? Where you stand on the Jetty vs. Tomcat debate probably lends a hand to which one you use in production. Continue Reading
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Video
24 Oct 2019
Tomcat vs. Apache HTTP Server: What's the difference?
Don't get caught up in the improper phrasing of "What's the difference between Tomcat and Apache?" Let's straighten out the confusion and compare the two server offerings. Continue Reading
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Blog Post
04 Sep 2019
How to deploy a JAR file to Tomcat by example
How do you deploy a JAR file to Tomcat? Typically you deploy WAR files, not JARs. But if you need to link to a JAR file from a Java web app on Apache Tomcat, here's how to do it. Continue Reading
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Feature
27 Aug 2019
Top Java programming tools used in application development
There's a multitude of Java tools that help the software development process. Here's a list of Java tools and technologies that every programmer should be aware of. Continue Reading
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Video
26 Jun 2019
Best Java static code analysis tools for code quality automation
Don't let faulty code bring down your software project. These Java code quality tools can help find and fix common errors before they become problems. Continue Reading
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Video
18 Jun 2019
Java command-line interface tools every JDK developer should know
These five JDK tools -- javac, javap, jstat, jdeps and jar -- should be on the must-know list for every developer to help comprehend the underlying code in a project. Continue Reading
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Blog Post
05 May 2019
How to install Tomcat as your Java application server
Doing Java web development and need to install Tomcat? This example will show you how to download, meet prerequisites, install and test the popular Java web server. Continue Reading
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Video
18 Apr 2019
Use Tomcat, Eclipse to create a JAX-RS REST web service
Use this step-by-step tutorial with an example rock-paper-scissors game to understand how to create and take advantage of RESTful web services with Eclipse and Tomcat. Continue Reading
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Feature
13 Mar 2019
Get these benefits when you simplify a WebSphere Portal URL
If your Portal URL displays the tired /wps/portal preamble in the browser's location bar, it's time to perform Portal URL simplification and change it. Continue Reading
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Blog Post
27 Feb 2019
Java Supplier interface example for functional programming
Functional supplier interface in Java tutorial There are only half a dozen classes you really need to master to become competent in the world of functional programming. The java.util.function ... Continue Reading
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Video
26 Feb 2019
Don't git revert that last commit, git reset instead
Developers should only use git revert if they need to reverse out a specific change in their code. To simply undo a previous commit to a shared repository, use git reset instead. Continue Reading
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Tip
31 Jan 2019
Developers find cautious optimism for serverless platforms
Experts urge cautious optimism around serverless development. It has its benefits, but tools that don't work as expected and a developer learning curve can cause some problems. Continue Reading
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Tutorial
29 Jan 2019
Use the Java JDeps tool to root out internal API calls
If you have internal Java API calls in your code, it will soon stop working. Here's a way to identify those calls and replace the problematic code with options on how to fix it. Continue Reading
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Video
01 Jan 2019
Step-by-step RESTful web service example in Java using Eclipse and TomEE Plus
In this easy-to-follow JAX-RS tutorial, we provide a RESTful web service example in Java using Eclipse and TomEE Plus, where we go from development to testing in less than 15 minutes. Continue Reading
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Video
06 Nov 2018
Git vs. GitHub: What is the difference between them?
What are Git and GitHub? Are they actually the same thing? In this comparison article, we compare Git vs GitHub and examine the differences between the tools, like who maintains them and how easy they integrate with other tools. Continue Reading
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Blog Post
01 Nov 2018
How to choose the right virtual reality development engine
Creating virtual 3D worlds has been a dream of programmers for many decades. Virtual reality, once a faraway fiction, is becoming a reality. Continue Reading
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Feature
01 Nov 2018
Stop with the unsafe internal Java API calls, or the JDK will stop it for you
Soon, any code that uses Java internal APIs will not compile, and shortly after that, code that uses classes in sun.misc will not even run. Continue Reading
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Blog Post
21 Oct 2018
Five Oracle Code One sessions you don't want to miss
From Jenkins pipelines written in Groovy, to cloud native applications written using the Eclipse MicroProfile, there is plenty to be excited about at the conference that was once called JavaOne. ... Continue Reading
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Video
15 Oct 2018
How to deploy Docker Hub-hosted microservices in AWS ECS
In this AWS ECS tutorial, we take a Spring Boot app contained in a Docker Hub-hosted image and deploy the associated microservices in AWS using Elastic Container Service. Continue Reading
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Video
01 Oct 2018
How to Git started and use the Github Desktop app tool
The GitHub Desktop client has been around for a few years now. In this GitHub Desktop app tutorial, we take a look at how well the tool performs the five basic Git commands. Continue Reading
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Video
06 Sep 2018
Let's dispel three common Java microservices myths
It's easy to develop Java microservices, but confusion over what they are and how they work tends to muddy the waters. Here, we clarify a few myths pertaining to Java microservices. Continue Reading
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Video
06 Aug 2018
Step-by-step SOAP web services example in Java using Eclipse
There was a time when creating a SOAP web service was an arduous task. In this step-by-step SOAP web services example in Java using Eclipse, let's show how times have changed. Continue Reading
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Quiz
31 Jul 2018
10 Git quiz questions to test your distributed version control skills
Test your distributed version control knowledge with this 10 Git questions quiz. It's a quick test that will see how well you know the basics of the popular DVCS tool. Continue Reading
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Video
26 Jul 2018
Step-by-step Spring Boot RESTful web services example in Java using STS
In a previous tutorial, we explained the basic tenets of good RESTful web service design. In this step-by-step Spring Boot restful web services example, we implement it. Continue Reading
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Video
20 Jul 2018
IoC example in Spring: Inversion of control explained clearly and quickly
All enterprise development frameworks are built around inversion of control. This IoC example demonstrates how it manifests itself in frameworks like Spring and Jakarta EE. Continue Reading
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Blog Post
19 Jul 2018
The secret history behind the success of npm and Node
The CTO of npm, the free package manager driving JavaScript, explains the perfect storm behind the catastrophic success of JavaScript and Node.JS. Continue Reading
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Video
17 Jul 2018
A git reset hard example: An easy way to undo local commits and shift head
For those looking to undo a commit, the easiest way to do it is by using the git reset hard command. It's the easy way to reset the HEAD, the index and the working tree as well. Continue Reading
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Video
07 Jul 2018
RESTful APIs tutorial: Learn key web service design principles
RESTful Java API designs shouldn't be hard to get right. This RESTful APIs tutorial shows core RESTful principles concerning URL structure and the effective use of HTTP methods. Continue Reading
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Blog Post
06 Jul 2018
Embed a WebSphere Liberty profile in an executable JAR with Maven
The last step you take before deploying your Java web apps into containers is packaging them in executable JAR files. Here we show you how to take the WebSphere Liberty profile's open source ... Continue Reading
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Tutorial
28 Jun 2018
5 basic Git commands developers must master: Tutorial with examples
Just getting started with Git or GitHub? If so, there are five basic Git commands you need to master. This Git commands tutorial for beginners takes you through each. Continue Reading
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Feature
26 Jun 2018
Red Hat's Operator Framework set to overhaul Kubernetes clusters
Operator Framework is designed to ease deployment and management of apps on top of Kubernetes clusters. We break it down with former CoreOS CEO Alex Polvi. Continue Reading
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Tutorial
24 May 2018
How to deploy an embedded Tomcat server in an executable JAR with Maven example
There's nothing magical about packaging Java web apps in an executable JAR file. This embedded Tomcat tutorial shows you how to use the Apache Maven plugin to create and run an executable JAR that has Tomcat embedded within it. Continue Reading
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Feature
23 May 2018
Why we still use Apache Ant tool in Java build and deploys
Plenty of companies still use the Apache Ant tool in Java development cycles and as part of their continuous deployments. Here's why Apache Ant is still a great choice for CI/CD. Continue Reading
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Feature
22 May 2018
Packaging Java programs in the modern age of microservices and mobile apps
The packaging of Java programs has taken an interesting turn, as the original JAR format becomes a favorite even for Java web apps deployed as microservices. Continue Reading
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Feature
27 Apr 2018
Build secure coding practices right into the IDE
Tools that integrate secure coding practices into the IDE promise to improve software security, even if the app in question isn't secure by design. Continue Reading
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Feature
20 Apr 2018
New IDE tools to visualize code may accelerate app dev
IDE tools for code visualization have always been difficult to implement. But given the benefits, new tools have emerged to make it possible to easily visualize your code. Continue Reading
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News
02 Mar 2018
Simplified automated cloud deployment with Bitnami's Stacksmith
Looking to do automated cloud deployment, or even help with security updates to your apps running in Docker containers? Bitnami's recently released Stacksmith promises to do just that. Continue Reading
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Blog Post
23 Jan 2018
Choosing the right container orchestration tool for your project
With so many competing container orchestration tools on the market, it's difficult to settle on which one to choose. But for many, Kubernetes is the right choice, and here's why. Continue Reading
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Podcast
09 Jan 2018
Fearless enhancement of legacy Java code with new SE features
While the Java SE 9 release has everyone talking about new features and syntax enhancements, JNBridge's Wayne Citrin insists legacy Java developers need not feel left behind. Continue Reading
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Guide
27 Dec 2017
Neutralizing threats and creating a secure Java software stack
This essential guide explores how developers can create a secure Java software stack, from the APIs used by the JDK to the methodologies used by Agile and DevOps teams. Continue Reading
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Podcast
20 Dec 2017
The best way to start creating cloud-native Java applications
How do software engineers transition traditional Java EE development into a world of cloud-native Java? Heptio's Craig McLuckie provides insights on transitioning. Continue Reading
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Feature
06 Nov 2017
Owning the Java Platform is more of a burden or a blessing
Oracle became stewards of the Java platform as a by-product of their acquisition of Sun Microsystems. But looking back, it seems that the Java Platform has been more of a burden than a blessing. Continue Reading
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News
06 Oct 2017
Java modules and Project Jigsaw a source of JavaOne 2017 pride
It wasn't easy getting Project Jigsaw ratified, but it is now part of the Java SE 9 package, and Oracle executives at JavaOne 2017 couldn't be prouder. Continue Reading
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Feature
28 Sep 2017
JavaEE 8 and Java 9 trending large at JavaOne 2017
What are the big trends in the Java world today? Just look at the JavaOne 2017 schedule and you'll see it goes way beyond just JavaEE 8 and the new Java 9 release. Continue Reading
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Podcast
27 Sep 2017
Cloud-native apps push static code analysis tools to the limit
The distributed nature of a cloud-native architecture, with microservices deployed to a multitude of containers, can test the limits of static code analysis tools. Continue Reading
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News
25 Sep 2017
Oracle releases Java 9, Java EE 8
Oracle released the long-awaited Java 9, along with Java EE 8 -- each with key improvements to simplify the development process using the language, including modularity in Java 9. Continue Reading
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Feature
13 Sep 2017
How to remove plain text passwords for a secure Java code base
Here are some strategies to remove plain text passwords from configuration files and your code base. It's one way a secure Java app can deter a malicious attack. Continue Reading
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Feature
12 Sep 2017
Containers and microservices complicate cloud-native security
As microservices-based applications are deployed to a sea of Docker containers, mitigating against cloud-native security issues is becoming a struggle. Continue Reading
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Podcast
07 Sep 2017
Microservices and containers can simplify DevOps security
You would think that managing a sea of containers and microservices would make DevOps security difficult, but it may, in fact, make DevSecOps easier. Continue Reading
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Podcast
06 Sep 2017
Cloud-native tooling for managing loosely coupled systems evolving
How does an organization manage loosely coupled systems built with containers and microservices? Apprenda's Sinclair Schuller discusses how tools are evolving. Continue Reading
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Feature
05 Jul 2017
Cloud native adoption means getting the DevOps tooling right
There are so many DevOps tooling options in the world of cloud native computing that many companies looking at a microservices and container based architecture are being overwhelmed by the options. Continue Reading
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Feature
05 Jul 2017
Keep your Java cloud apps running during an Amazon S3 outage
Many people had to learn the hard way that an Amazon S3 outage is possible. Here we look at how to keep your Java cloud apps running, even if the Amazon cloud isn't. Continue Reading
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Feature
22 Jun 2017
How microservices patterns made Uber's architecture perform better
How did Uber manage to deal with the inevitable Halloween rush? Applying microservices patterns to their architecture played a big part. Continue Reading
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Feature
20 Jun 2017
Effective DevOps hinges on automating a continuous delivery pipeline
Many organizations struggle with bringing development and operations together, only to realize that effective DevOps means successfully automating a continuous delivery pipeline. Continue Reading
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Feature
11 May 2017
Effective DevOps pipelines require a continuous delivery tool chain
The key to an effective DevOps implementation is understanding your tools, and implementing an effective continuous delivery tool chain. Continue Reading
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Blog Post
10 May 2017
Java modularity's future takes a hit as Project Jigsaw (JPMS) is voted down
Can you believe all of this drama surrounding Project Jigsaw and the Java modularity debate? I was so thankful yesterday when President Donald Trump fired the director of the FBI, drowning out all ... Continue Reading
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Opinion
05 May 2017
Cloud-native vendor consolidation key to container technology adoption
Production deployment of containers and microservices currently requires the best technologies. Cloud-native vendor consolidation will simplify decisions but limit choice. Continue Reading