Declarative programming is like when you ask your friend to write an essay, you don’t care how does he write it, you just want to get the result. Instead, programmers use expressions to tell the computer what needs to be done, but not how to accomplish the task.

Functional programming languages are declarative, meaning that a computation's logic is expressed without describing its control flow. The opposite of imperative. In computer science, declarative programming is a programming paradigm that expresses the logic of a computation without describing its control flow. This paradigm emphasizes the concept of what to dorather than how to do it. In declarative programming, there are no statements. A Declarative Solution where we compose various functions to form a higher-order composite function that solves the problem, typically using java.util.stream.Stream or … There are several sub-paradigms of the declarative programming paradigm, such as the functional or the logic programming paradigms. Declarative programming is a method to abstract away the control flow for logic required for software to perform an action, and instead involves stating what the task or desired outcome is.

I draw the line between declarative and non-declarative at whether you can trace the code as it runs.

In the declarative programming paradigm, you describe a result or a goal, and you get it via a " black box ". If both of these conditions are met, declarative programming is very efficient. At runtime, the container uses the metadata specified … Regex is 100% declarative, as it’s untraceable while the pattern is being executed. From the definition of the Declarative Programming: Characteristics of declarative languages: Model of computation based on a system where relationships are specified directly in terms of … This works well, provided the specifications of the final state are clearly defined and an appropriate implementation procedure exists. What makes EJB components special is the declarative programming model through which we can specify the services such as security, persistence, transaction etc., that the container should provide. In declarative programming, the solution path to reach the goal is determined automatically. Declarative programming is a contrast programming paradigm compared with imperative programming.

An EJB only implements the business logic; the services are associated through a deployment descriptor, which essentially acts as metadata for the EJB.