JPA is the Java Persistence API, a specification for managing relational databases using Java. If this sounds complicated - don’t worry! It’s not.īefore we dig in, let’s cover some background:Ī resource server is a programmatic access point for your server’s functions and data (basically the same as an API server and/or possibly REST server). On top of that, you’re going to implement a group-based authentication and authorization layer using OAuth 2.0. In this post, you’re going to build a resource server using Spring Boot and Spring Data JPA. When coupled with Okta, you get professionally maintained OAuth and JWT technologies easily integrated into Spring Boot using Spring Security. Within the Java ecosystem, Spring makes building secure resource servers for your data simple. Java is a great language with decades of history in professional, enterprise development, and is a great choice for any application’s server stack. When you start the project now, the Spring Boot application will use PostgreSQL for the database.Every non-trivial application needs a way to save and update data: a resource server that is accessible via HTTP. Once you are done with the preceding configuration, Spring Boot becomes ready for use with PostgreSQL. Click Here to Become a Spring Framework Guru! Running Spring Boot with PostgreSQL However, in testing or production databases, you will want to use the validate option. This tells Hibernate to recreate the database on startup. Since the example web application is using JPA, we configured Hibernate for PostgreSQL in Line 5 to use the create-drop option. Thus, by simply providing properties for the PostgreSQL datasource we can override the H2 datasource. But this is only if you do not specify another datasource. Since H2 is on the classpath, Spring Boot will automatically provide us common sense defaults for the H2 datasource. Our example application is using the H2 database for development. įor PostgreSQL up to 9.1, you need to add the following dependency with your specific version. To include them in your project, you need to add the following dependency (for PostgreSQL 9.2 and later) to your Maven POM file with your specific version. The required JARs are included in the Central Repository of Maven. To use PostgreSQL, you will need the proper database drivers. createdb -h localhost -p 5432 -U postgres springbootdb To create a database named springbootdb open a command prompt/terminal window and run the following command. You can locate this tool in the bin folder of your PostgreSQL installation. You can do this by using the createdb command line tool. Let’s first start by creating a database for use with Spring Boot. Previously, I wrote about creating a web application using Spring Boot and also wrote about configuring Spring Boot to use MySQL for storing the application data. In this post, we will learn how to change Spring Boot from the default in-memory H2 to PostgreSQL, which is one of the most advanced open source database that you will frequently see in production use.įor this post, I’m using PostgreSQL running locally on my laptop. As the development progresses, you would most probably require an RDBMS to develop and test your application before deploying it to use a production database server, such as Oracle, MySQL, or PostgreSQL. In-memory databases are useful in the early development stages in local environments, but they have lots of restrictions. Spring Boot automatically sets up the in-memory database for your use when it finds the database on your classpath. If you are using Maven, you only specify the dependency of the database to use in the POM file. To use the embedded databases, you don’t need any special configuration, not even any connection URL. They are great to use during development when you need to populate your database once your application starts, test your persistent entity mappings, and remove any data when your application ends. Obviously, they don’t provide persistent storage but they a fast way to test persistent functions of your Spring Boot application without going through the hassles of installing a database server. These databases are lightweight, easy to use, and emulates other RDBMS with the help of JPA and Hibernate. Spring Boot makes it extremely convenient for programmers to quickly develop Spring applications using an in-memory database, such as H2, HSQLDB, and Derby.
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