Bean

Expando and MetaClass

How Groovy's Expando class and ExpandoMetaClass let you add properties and methods to objects dynamically at runtime, even to existing Java classes.

Bean Scopes in Spring

Understand the difference between singleton, prototype, and web-aware bean scopes, and when scoped proxies are required.

Configuration Classes

Learn how @Configuration classes and @Bean methods provide explicit, programmatic bean wiring, and how to compose and conditionally activate them.

Spring Beans and Annotations

Understand what a Spring bean is, how stereotype annotations declare them, and how lifecycle and qualifier annotations control their behavior.

The Spring Application Context

What the ApplicationContext is, how it manages the bean lifecycle, and how dependency injection resolves object graphs at startup.