Spring Security 4 for Spring MVC using Spring Data JPA and Spring Boot.I have been writing a series of tutorials on using Spring Security 4 in Spring MVC application starting from the basic in memory authentication.In this post, I am writing a step by step guide to secure a Spring MVC application using Spring Security 4 along with Spring Data JPA and Spring Boot.That sounds like a lot of different concepts to learn, but it is really simple.If you do not know or if you are new to Spring Data JPA or even JPA Java Persistence API, you might probably think why should you go for Spring Data JPA when you can simply use Spring JDBC to secure the application with the user details stored in a database.To understand this, read the next paragraph.Java Persistence API JPA Unlike writing a plain DAO that consists of plain JDBC code everywhere full of Prepared.Statements and Sql.Connections etc, we just map the original fields in the database table to Java classes called Entities, provide SQL queries and let the persistence api handle the connections, query execution etc without writing much boilerplate code.JPA is just a specification and to use it, you must use a provider of this Specification such as Hibernate.In other words, consider JPA as a set of interfaces and you need an implementation of these interfaces to actually use it, which is called a Provider.Any provider or implementation of JPA specification, lets you create Java classes called Entities, provide SQL queries and handle the connections, query execution etc.Spring Data JPA takes a step forward and handles the DAO layer around data repositories with out of the box query generation for most commonly required scenarios.Java Jpa Select For Update' title='Java Jpa Select For Update' />
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