This guide describes how to use Spring Session to transparently leverage a relational database to back a web application’s
HttpSession when using Spring Boot.
|The completed guide can be found in the httpsession-jdbc-boot sample application.|
Before you use Spring Session, you must ensure to update your dependencies. We assume you are working with a working Spring Boot web application. If you are using Maven, ensure to add the following dependencies:
<dependencies> <!-- ... --> <dependency> <groupId>org.springframework.session</groupId> <artifactId>spring-session-jdbc</artifactId> </dependency> </dependencies>
Spring Boot provides dependency management for Spring Session modules, so there’s no need to explicitly declare dependency version.
After adding the required dependencies, we can create our Spring Boot configuration.
Thanks to first-class auto configuration support, setting up Spring Session backed by a relational database is as simple as adding a single configuration property to your
Under the hood, Spring Boot will apply configuration that is equivalent to manually adding
This creates a Spring Bean with the name of
springSessionRepositoryFilter that implements Filter.
The filter is what is in charge of replacing the
HttpSession implementation to be backed by Spring Session.
Further customization is possible using
server.session.timeout= # Session timeout in seconds. spring.session.jdbc.initializer.enabled= # Create the required session tables on startup if necessary. Enabled automatically if the default table name is set or a custom schema is configured. spring.session.jdbc.schema=classpath:org/springframework/session/jdbc/[email protected]@[email protected]@.sql # Path to the SQL file to use to initialize the database schema. spring.session.jdbc.table-name=SPRING_SESSION # Name of database table used to store sessions.
For more information, refer to Spring Session portion of the Spring Boot documentation.
Spring Boot automatically creates a
DataSource that connects Spring Session to an embedded instance of H2 database.
In a production environment you need to ensure to update your configuration to point to your relational database.
For example, you can include the following in your application.properties
spring.datasource.url=jdbc:postgresql://localhost:5432/myapp spring.datasource.username=myapp spring.datasource.password=secret
For more information, refer to Configure a DataSource portion of the Spring Boot documentation.
Our Spring Boot Configuration created a Spring Bean named
springSessionRepositoryFilter that implements
springSessionRepositoryFilter bean is responsible for replacing the
HttpSession with a custom implementation that is backed by Spring Session.
In order for our
Filter to do its magic, Spring needs to load our
Last we need to ensure that our Servlet Container (i.e. Tomcat) uses our
springSessionRepositoryFilter for every request.
Fortunately, Spring Boot takes care of both of these steps for us.
The httpsession-jdbc-boot Sample Application demonstrates how to use Spring Session to transparently leverage H2 database to back a web application’s
HttpSession when using Spring Boot.
You can run the sample by obtaining the source code and invoking the following command:
$ ./gradlew :samples:httpsession-jdbc-boot:bootRun
You should now be able to access the application at http://localhost:8080/
Try using the application. Enter the following to log in:
Now click the Login button.
You should now see a message indicating your are logged in with the user entered previously.
The user’s information is stored in H2 database rather than Tomcat’s
Instead of using Tomcat’s
HttpSession, we are actually persisting the values in H2 database.
Spring Session replaces the
HttpSession with an implementation that is backed by a relational database.
When Spring Security’s
SecurityContextPersistenceFilter saves the
SecurityContext to the
HttpSession it is then persisted into H2 database.
When a new
HttpSession is created, Spring Session creates a cookie named SESSION in your browser that contains the id of your session.
Go ahead and view the cookies (click for help with Chrome or Firefox).
If you like, you can easily remove the session using H2 web console available at: http://localhost:8080/h2-console/ (use
jdbc:h2:mem:testdb for JDBC URL)
Now visit the application at http://localhost:8080/ and observe that we are no longer authenticated.