Securing REST services and web applications with spring boot security starter

Security is one of the predominant aspects one must consider when developing any application or service.

This article will cover step by step guide to implement spring security for spring boot applications.

For instance, we will implement spring security for the following API’s:

We can configure spring security Authentication providers in multiple ways.

In this article, We will see configure it with two authentication providers:

1. An in-memory authentication provider.

In this case, we will store the username and password to be used during authentication in the properties(application.yml) file.

2. A custom authentication provider.

We will implement a custom authentication provider using AuthenticationManagerBuilder.

Here configurations are store in DB.

UserDetailsServiceImpl.java: It will implement UserDetailsService which locates user based on the username.

CredentialRepository.java: It will fetch the user by username from DB.

For any unauthorized access to the above API’s it will show the following error :

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