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Rolling Stones on stage: release me Everyone does it, some even several times a day. But few are aware of the complex interlocking mechanisms that make up a complete software release. This is why it sometimes happens that a package…

Excepciones Tragadas El manejo de excepciones debe ser un conocimiento básico para los desarrolladores de Java. Pero un uso seguro no es tan fácil como parece en un primer momento. También varios libros recomiendan no usar excepciones para evitar problemas…

Source code repositories growing over time. With multiple daily revisions by different team members, it becomes very difficult to identify important changes in the source code. Expressions in SCM enable the writing of clear, standardized commit messages that are both…

Preventing SQL Injections in Java using SQL Parameters with the Java Persistence API (JPA) and Hibernate ORM. Continue reading →

An important advantage of the Java platform is the large variety of freely available infrastructure components, tools and 3rd party libraries. You can quickly lose track of it. This article lists the most important Java frameworks and explains what they…

When you own a big collection of PDF files the used storage space can increasing quite high. Sometimes I own PDF documents with more than 100 MB. Well nowadays this storage capacities are not a big issue. But if you…

last update: If you plan to get in touch with Java Enterprise, may in the beginning it’s a bit overwhelmed and confusing. But don’t worry It’s not so worst like it seems. To start with it, you just need to…

The second article of the application configuration explain implementation details and show how the demonstrated solution can be extended. It also links to the ready to use java implementation inside TP-CORE. Continue reading →

Changeable configuration for applications usually miss a history of the configuration values, wich often leads during updates to misconfigurations. The solution described in this article use a database table where configuration entry supports default and user values. Another important feature…

System backups are a very essential procedure every user need to run regular. One of the most important points of a backup is to save your full e-mail profile. In this short tutorial we show how to backup and restore…

In this short tutorial I describe how you are able to setup AdGuard Home on and Raspberry PI 4 with Ubuntu Server and Docker, to protect your personal network against spam and spyware. Continue reading →

Nobody wants to be the one. That’s nothing new. That’s why meetings aren’t exactly popular with test engineers. To avoid despair, we recommend BugFix Bingo. Continue reading →

Maven POM demystified: enhance your build Since more than a decade Apache Maven is one of the most convenient Build and Reporting tools for Java projects. The success of this tool is quit more than just being a build tool.…

On our first LiveStream we explain shortly what is Docker and how fast it can installed on an Ubuntu server. After this you get an overview about all the components we need for a full NextCloud installation. Step by step…

After some years the virtualization tool Docker proofed it’s importance for the software industry. Usually when you hear something about virtualization you may could think this is something for DevOps or administrators and will not effect me as a developer…

APIs, or interface descriptions, are especially important in RESTful services. To keep the project well-structured from the very beginning, allowing it to grow organically while remaining maintainable, a few simple rules should be followed. This article describes them. Continue reading…

This article introduces a new tool for the DevOps CI /CD pipeline. The SCM-Manager can host Git, Subversion, and Mercurial repositories in one solution. Continue reading →

Refactoring Disasters: A Story how I failed For my small Open Source project TP-CORE, you can find it on GitHub, I had the gorgeous Idea to replace the iText library for OpenPDF. After I made a plan how I could…

API4Future: A journey how to create a stable API By experience, enterprise applications have a long lifetime period. This is one oft the  reasons why we need to pay a lot of attention for maintenance. But how we are able…

Mission accomplished: deploy to Maven Central Many developers have ideas they work on it in their spare time. The most of us are convinced about open source and share their own projects on platforms like GitHub. But what happen after…

Continuous Stupidities – did DevOps fail? Heavy motivation to automate everything, even the automation itself, is the common understanding of the most DevOps teams. A strong dominance of administrators in those teams (Operations), transform ideas of increasing the development process…

After the gang of four (GOF) Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides published the book, Design Patterns: Elements of Reusable Object-Oriented Software, learning how to describe problems and solutions became popular in almost every field in software…

To meet the definition of code quality, it’s not enough to focus solely on the source code. Structure, organization, and maintenance also play an important role. Continue reading →

In a standard set-up for Java projects like NetBeans, Maven, and JUnit, it is not that difficult to produce your first test code. Besides, this approach is used in Test Driven Development (TDD) and exists in other technologies like Behavioral…

A short video introduction to Docker, a Linux-based container technology for virtualizing critical applications and infrastructure services. An essential tool for developers, DevOps, and system administrators. Continue reading →

When Oracle in 2017 introduced the new release cycle for Java I started to have a look for options. One of the options I can recommend is Java OpenJdk. Check in this post why I’m not agree with the new…

Apache LicenseVersion 2.0, January 2004http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. “License” shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. “Licensor” shall mean…