What are cross-cutting concerns?

In any application, there is some generic functionality that is needed in many places. But this functionality is not related to the application's business logic. Suppose you perform a role-based security check before every business method in your application. Here security is a cross-cutting concern. It is required for any application but it is not necessary from the business point of view, it is a simple generic functionality we have to implement in many places in the application. The following are examples of the cross-cutting concerns for the enterprise application.

• Logging and tracing
• Transaction management
• Security
• Caching
• Error handling
• Performance monitoring
• Custom business rules

Let's see how we will implement these cross-cutting concerns in our application by using aspects of Spring AOP.