This great primer for Contexts and Dependency Injection covers the need for it and a simple implementation in a Java EE environment that focuses on injecting properties.
Angular is one of the most popular frameworks for web development available. With the release of it's latest version, it has given even more features to web developers.
Here's an introduction to logging with Log4j. If you aren't familiar with it already, take a look at what it offers and how to configure it for your Java projects.