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Security is a complex topic to understand in-depth. In addition to that, implementing security for complex microservices based systems using OAuth 2.0 and OpenID Connect specs is even harder. Frameworks and libraries, like Spring Security, help to reduce the complexity, but still there is a steep learning curve to understand how to properly implement security. In this Spring Security OAuth2 Tutorial series, I would like to share my learning on implementing security for a simple microservices based application using Spring Security OAuth2.

Spring framework 6.1 introduced a new JdbcClient API, which is a wrapper on top of JdbcTemplate, for performing database operations using a fluent API. Spring Boot 3.2 includes Spring framework 6.1, so let’s take a quick look at how we can use JdbcClient to implement various database operations in a simplified manner. First, let’s go to https://start.spring.io/ and create a Spring Boot application by selecting Spring JDBC, PostgreSQL Driver, Flyway Migration, and Testcontainers starters.

In this Spring Boot REST API Best Practices series, we have learned how to implement CRUD operations so far. In this Part-4, we will explore how to implement exception handling for our APIs. Spring Boot REST API Best Practices - Part 1 : Implementing Get Collection API Spring Boot REST API Best Practices - Part 2 : Implementing Create and Update APIs Spring Boot REST API Best Practices - Part 3 : Implementing FindById and DeleteById APIs Spring Boot REST API Best Practices - Part 4 : Exception Handling in REST APIs (This article) You can find the sample code for this tutorial in this GitHub repository.

In this Spring Boot REST API Best Practices - Part-3, we will see how to implement FindById and DeleteById API endpoints. Spring Boot REST API Best Practices - Part 1 : Implementing Get Collection API Spring Boot REST API Best Practices - Part 2 : Implementing Create and Update APIs Spring Boot REST API Best Practices - Part 3 : Implementing FindById and DeleteById APIs (This article) Spring Boot REST API Best Practices - Part 4 : Exception Handling in REST APIs You can find the sample code for this tutorial in this GitHub repository.

In this Spring Boot REST API Best Practices - Part-2, I will explain some of the best practices we should follow while implementing Create and Update API endpoints. Spring Boot REST API Best Practices - Part 1 : Implementing Get Collection API Spring Boot REST API Best Practices - Part 2 : Implementing Create and Update APIs (This article) Spring Boot REST API Best Practices - Part 3 : Implementing FindById and DeleteById APIs Spring Boot REST API Best Practices - Part 4 : Exception Handling in REST APIs This article is a continuation of Spring Boot REST API Best Practices - Part 1.

In this Spring Boot REST API Best Practices Series, I will explain some of the best practices we should follow while implementing REST APIs. Also, I will explain some of the common mistakes developers do and how to avoid them. Spring Boot REST API Best Practices - Part 1 : Implementing Get Collection API (This article) Spring Boot REST API Best Practices - Part 2 : Implementing Create and Update APIs Spring Boot REST API Best Practices - Part 3 : Implementing FindById and DeleteById APIs Spring Boot REST API Best Practices - Part 4 : Exception Handling in REST APIs In this Part-1, we are going to implement our first API endpoint which is to fetch a list of resources.

In the previous Spring Boot JdbcTemplate Tutorial we have seen how to initialize database using schema.sql and data.sql scripts. This may be useful for demos and quick prototypes, but for real world applications we should use a database migration tool. Flyway is one of the most popular Java-based database migration libraries. Database migrations can be performed using Flyway as a standalone library, using flyway-maven-plugin or using Flyway Gradle plugin. Spring Boot provides out-of-the-box support for Flyway database migrations.

Spring provides a high-level abstraction on top of JDBC with JdbcTemplate to make it easier to perform database operations. Spring also provides a high-level abstraction on top of JPA with Spring Data JPA to make it easy to implement CRUD operations, sorting, pagination, etc. Whether you use JdbcTemplate or JPA/Hibernate or Spring Data JPA, you need to take care of handling database transactions. A database transaction is a single unit of work, which either completes fully or does not complete at all, and leaves the database in a consistent state.

Introducing Spring Boot JDBC Support Spring’s JdbcTemplate provides high-level abstraction on top of DataSource to perform database operations. In addition to that Spring’s declarative Transaction Management capabilities helps to manage database transactions in a simplified way without having to write boilerplate code. Spring Boot simplifies the configuration of DataSource, TransactionManager, etc. by using it’s AutoConfiguration mechanism. How SpringBoot AutoConfiguration magic works? If you want to learn more about Spring Boot AutoConfiguration, see How SpringBoot AutoConfiguration magic works?

Introducing Spring Profiles Typically, software applications run in different environments. During development, it will be local, and then we may deploy it on QA, Staging, Performance and finally in Production environments. You may have to configure your application with different configuration properties while running the application in different environments. For example, if you are using a database then you may configure the database connection properties to a locally running database during development.