From Spring Quickly by Laurentiu Spilca

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Spring is a must-learn tool for Java developers.¬†Spring Quickly¬†introduces you to Java development with Spring by concentrating on the core concepts you’ll use in every application you build. You’ll learn how to refactor an existing application to Spring, how to use Spring tools to make SQL database requests and REST calls, and how to secure your projects with Spring Security. There’s always more to learn, and this book will make your next steps much easier.