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Spring Lemon JPA Guide
spring-lemon-jpa is one of the leafs in the spring-lemon set of libraries, which your monoliths or authentication services can use. It adds authentication functionalities to spring-lemon-commons-jpa. It comes with a lot of things, which are discussed below.
AbstractUser comes with the essential user fields, such as email and password. Your User entity should inherit this. To know how, refer to the getting started guide.
The roles field of AbstractUser holds all the user roles. It's a set of String, and so you're free to add any custom roles you may want to use in your application.
LemonJpaSecurityConfig, along with all the helper beans in the com.naturalprogrammer.spring.lemon.security package, are responsible for configuring security of your application. This package is packed with many beautiful features, like stateless social signup/login.
It's quite customizable — provide your own bean to override a built-in one. A simple example is MySecurityConfig in the lemon-demo-jpa project.
UniqueEmail and UniqueEmailValidator define a constraint that's used in AbstractUser for ensuring uniqueness of emails of the user.
LemonController and LemonService classes define a user-module API. You'll need to extend these. To know how, refer to the getting started guide.
LemonService is composed of many protected methods, which could be overridden for any customization.
LemonUtils contains a couple of utility methods, e.g. for logging in a user programmatically.