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When retrieving metadata at runtime, the Class.getAnnotation() method appears straightforward, but its execution path relies heavily on JVM-level caching and dynamic proxy generation. Every annotated class maintains an internal AnnotationData instance that stores resolved metadata. This cache utilizes a Map<Class<? extends Annotation>, ...

The proxy pattern is a foundational concept for understanding the underlying mechanics of Spring AOP. It allows you to control access to an object by providing a surrogate or placeholder. Static Proxy In a static proxy implementation, the proxy class is created manually or by specific tools before compilation. Core Components: Subject Interfac ...

In software architecture, cross-cutting concerns such as logging, security checks, and transaction management often need to be applied across multiple components. A naive approach involves manually inserting logic into every business method, leading to code duplication and tight coupling. For instance, if we need to audit execution before and a ...

Background In object-oriented systems, certain objects may be expensive to create, or some operations require security checks. Directly accessing such objects can introduce complications. One solution is to introduce an intermediate layer—the proxy layer. This is the essence of the Proxy Pattern. The Proxy Pattern, one of the 23 classic design ...

Resource Loading via ClassLoader The process begins with loading the configuration file, typically mybatis.xml, using Resources.getResourceAsStream(). This method leverages Java’s class loading mechanism to locate resources within the classpath. It does not resolve absolute file paths directly but instead relies on the ClassLoader hierarchy to ...