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Login Module After completing all the previous modules, we continue with login validation, global exception handling, transaction management, and AOP. A simple login checks the database for the employee. This can be implemented using a three-layer architecture. Controller Layer Create a LoginController class dedicated to handling login requests ...

Professional kitchens prioritize efficiency through meticulous preparation and optimized layout—concepts mirrored in software architecture. Just as mise en place ensures all tools and ingredients are ready, a well-structured codebase minimizes redundancy and maximizes maintainability. In this context, Aspect-Oriented Programming (AOP) emerges a ...

Implementing Multiple Data Sources in Spring Boot with AOP In this article, we'll explore how to configure a Spring Boot application with multiple database connections using Aspect-Oriented Programming (AOP). We'll use HikariCP as the connection pool, MybatisPlus as the ORM framework, and demonstrate connections to both MySQL and SQL Server dat ...

Transaction management belongs logically in the service layer. Spring supports two primary approaches: Programmatic transaction management (for advanced use cases) Declarative transaction management (recommended for most applications) Declarative transactions can be implemented either via XML configuration or annotations — the latter being th ...

The @Component annotation serves as a generic marker for any class requiring Spring container management. Applied to POJOs, service layers, or persistence entities, it triggers automatic instantiation and registration in the IoC container. Conversely, @Bean declares a managed object within configuration classes. Placed on methods, it registers ...

Aspect-Oriented Programming (AOP) modularizes cross-cutting concerns—such as auditing, security, and transaction management—that traditionally scatter across application layers. By encapsulating these behaviors into reusable aspects, AOP reduces coupling between business logic and infrastructure code. Spring implements AOP through proxy-based i ...

Problem Statement In a flash sale system, I encountered a scenario where one aspect handles Redis-based distributed locking and rate limiting, while another aspect is responsible for publishing order messages to a message queue. The core challenge: how to transmit data computed in the first aspect to the second aspect for further processing. So ...

AOP enables method enhancement without modifying the original source code (enhancement = proxy). AOP Pointcut Expression Syntax: execution([access modifier] [return type] [full class path] [method name] ([parameter list])) Example: @Before(value = "execution(* com.example.service.AccountService.deposit(..))") Join Point Any method w ...

Declaring @Transactional alone does not trigger transactional behavior; you must activate the declarative transaction infrastructure explicitly. In a Java-based configuration, annnotate a @Configuration class with @EnableTransactionManagement and expose a PlatformTransactionManager bean. The proxyTargetClass attribute (or proxy-target-class in ...

To enable Aspect-Oriented Programming in Spring Boot, first add the required dependency to your pom.xml: <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.1</version> </dependency> Here's the complete implementation with all necessary com ...