WebSocketServer crashes when overridden methods (onClose, onError) throw Exceptions. It hit us in production: Due to circumstances, our implementation threw some exceptions in the wrong places for one ...

Reflection was essential to the advanced Java toolkit for years. Now it's being superseded by newer, safer options. Here's how to use MethodHandle and VarHandle to gain programmatic access to methods ...

This is an example of overriding the application.yml file with the OS environment variables. Single or Array environment variables can be overridden. 4 and 5 are the most common use cases for ...

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We discuss how to work with directories, sub-directories, and traverse them using Java and the DirectoryStream method. Learn more. A directory is an organizational file system structure that contains ...

Abstract: Java (de)serialization is prone to causing security-critical vulnerabilities that attackers can invoke existing methods (gadgets) on the application's classpath to construct a gadget chain ...

How can we debug method calls that are not part of our own source code, say a call to JButton.setEnabled()? Java provides us with anonymous inner classes, which come in quite handy for this problem.