[NEW] Master the Spring Fundamentals, HOW it works inside

Explore how bean definitions differ between annotation-based components and Java configuration, as a restaurant service returns a cook implementation; understand how autowired mode changes and the role of configuration classes.

Explore bean scopes, including the default singleton and prototype injection into a singleton, and implement a custom bean using component and annotation-based configuration.

Implement a custom Spring scope that reuses a bean for five seconds, creating a new bean if the previous one is older, and register destruction callback with the bean factory.

Explore the Spring bean life cycle by implementing init and destroy methods, using post construct and pre-destroy, and configuring via annotations or Java config for singleton and prototype beans.

Develop a custom bean factory postprocessor to scan bean definitions in our package, detect the init method annotation, and register and set each bean's init method name.

Explore how bean post processor works with bean factory post processor, detailing before and after initialization steps, bean vs proxy distinction, and the chain of responsibility among processors.

Create two custom bean post processors to practice preparing code for bean post processors, exploring postProcessBeforeInitialization, postProcessAfterInitialization, and postConstruct, with proxy, dynamic proxy, and cglib considerations.

Explore implementing a dynamic proxy via a bean post processor with an invocation handler. See how the proxy forwards methods to the target bean and impacts post construct annotations.

Learn to build dynamic and cglib proxies using enhancer, callback, and invocation handler, switch proxy types, and preserve the original bean for post processors through method interception.

Create a second bean post processor that enforces the @Critical annotation with a max time, uses reflection to time methods, and prints a warning when execution exceeds the limit.

Explore a dynamic proxy approach in Spring to enforce a critical annotation, measuring method execution time against a max threshold and emitting warnings when exceeded during a pizza order workflow.

Master spring autowiring with @Autowired and @Qualifier in constructor, method, field injections. Learn how Spring resolves candidates via primary or bean name, and when no unique bean definition exception arises.

Explore how primary annotation prioritizes beans and how @Qualifier with custom qualifiers selects the correct bean for autowired injection, such as fast cook or slow cook.

Explore how autowired and qualifiers wire dependencies in Spring through hands-on practice, covering single vs multiple constructors, required and qualifier annotations, and injecting lists and maps of beans.

Explore how spring aop uses dynamic and cglib proxies to intercept methods. See interface-based dynamic proxies and target-class cglib proxies created with enhancer, including before and after method calls.

Test Spring AOP in practice by using dynamic proxies and cli proxies, adjust proxy target class, and implement aspects with different advices around a critical annotation.