Using Spring Security for authentication and authorization

Spring Security is widely used to enable authentication and authorization, using many different mechanisms such as form-based logic, header-based login (Basic), and so on. In this application, we will be protecting the User Registration microservice. Consider the following code:

<dependencies>
    ...
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    ...
</dependencies>

The preceding entries will import all the dependencies related to Spring Security. Now, let's look at the configuration:

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new SCryptPasswordEncoder...