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The service layer inside the core coordinates business execution. It implements the inbound port and utilizes the outbound port.

: Defines ports and use cases that coordinate the domain logic.

package com.example.myapp.ports.inbound; import com.example.myapp.domain.model.Order; import java.math.BigDecimal; public interface CreateOrderUseCase Order createOrder(BigDecimal amount); Use code with caution.

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language:java topic:hexagonal-architecture created:2021-01-01..2021-12-31 The service layer inside the core coordinates business

Several Java consultancies (e.g., Baeldung Pro, InfoQ, and O’Reilly) released time-limited free PDFs during the 2021 "Software Architecture Summit."

Which (Spring Boot, Quarkus, Micronaut) you are targeting.

I can help you find if you share the exact ISBN or author.

Last updated: 2026 – This article respects copyright laws and encourages obtaining free materials legally. package com

// Getters and setters

public class AuthenticationApplicationService private final AuthenticationService authenticationService; private final UserRepository userRepository;

What you plan to build with (Spring Boot, Quarkus, Micronaut, etc.)?

You can download a free PDF version of this article using the following link: designing-hexagonal-architecture-with-java-pdf-free-2021-download . I can help you find if you share the exact ISBN or author

If your team decides to migrate from SQL to a NoSQL database, you only rewrite the Secondary Adapter layer. The core application logic remains untouched, un-retested, and completely safe.

Let us look at a practical example of a user registration system built with standard Java structures. Step 1: The Domain Entity

package com.myapp.domain.ports.inbound;

public class Main public static void main(String[] args) UserRepository userRepository = new DatabaseUserRepository(); UserService userService = new UserService(userRepository); User user = userService.findById(1L); System.out.println(user.getName());

public interface UserRepository User findByUsername(String username);