Handling Null: Optional and Nullable Types
Java is infamous for its NullPointerException: calling a method or accessing an attribute of an object that has not been initialized.
Week in review: 4 April 2022
New authors
Welcome to Jakob Löhnertz, who published a first article on foojay.io this week.
Published this week
Debugging JAXB Production Issues
Failures in XML parsing can happen in production when the source data changes. These are notoriously hard to debug... At least until now...
How to style a Vaadin Application
The basics of styling a Vaadin application using CSS: custom themes, override Lumo values, and selectively style views and components.
Three Mistakes Developers Make Preventing Getting Hired On Projects
From experience, I have seen three big mistakes every junior software developer makes that could easily be solved.
Switch Statement and the Factory Pattern in Three JVM Languages
Let's examine a program selection control mechanism, for a value, expression or variable type to influence program flow execution, for …
Java Panama Polyglot (C++) Part 1
Java Panama Polyglot series: quick tutorials or recipes on how to access native libraries written in other languages!
Spring4Shell: The zero-day RCE in the Spring Framework explained
We’ll explore how remote code execution (RCE) works, explaining Spring4Shell, a zero-day vulnerability in the Spring framework that could …
Quest to the OS: Java Native Memory
Let’s embark on an epic journey to the wonderland of java native memory to the level of OS while investing in a non-trivial memory issue.
Migrating from Java EE to Jakarta EE with IntelliJ IDEA
In this post we're going to migrate some sample code from the `javax` namespace to `jakarta`.