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Introducing Spring Session 2
Vedran Pavić
@vedran_pavic
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Agenda
• About me
• New in Spring Session 2
• Project Modules
• Spring WebFlux Support
• Improvements
• Migrating to Spring Session 2
• Custom Session Repository
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About Me - Vedran Pavić
• Spring user for 9 years
• Contributor to Spring projects for 2.5 years
• Spring Session committer for 1.5 year
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Project Modules
• Spring Session 1.x was a single JAR
• Convenient, but hard to evolve and maintain
• Spring Session 2.0 is JAR per session store
• Arrangement similar to Spring Data
• Community extensions are welcome
• Dedicated section in reference manual
• Spring Boot and Initializr impact
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Project Modules - Spring Session 1.3
• spring-projects/spring-session
• spring-session (Core, Redis, Gemfire, MongoDB, JDBC, Hazelcast)
• spring-session-data-redis (starter module)
• spring-session-data-gemfire (starter module)
• spring-session-data-mongo (starter module)
• spring-session-jdbc (starter module)
• spring-session-hazelcast (starter module)
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Project Modules - Spring Session 2.0
• spring-projects/spring-session
• spring-session-core
• spring-session-data-redis
• spring-session-jdbc
• spring-session-hazelcast
• spring-projects/spring-session-data-geode
• spring-session-data-geode
• spring-session-data-gemfire
• spring-projects/spring-session-data-mongodb
• spring-session-data-mongodb
• spring-projects/spring-session-bom
• spring-session-bom
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Spring WebFlux Support
• Follows the familiar Spring Session patterns
• e.g. @EnableRedisHttpSession vs @EnableRedisWebSession
• Much simpler than Servlet support
• Key APIs are a part of spring-web
• Redis & MongoDB session stores
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Spring WebFlux Support Demo
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Improvements - Core
• Move to Java 8 & Spring 5 as baseline
• Core API improvements
• Refreshed Session & SessionRepository
• HttpServletRequest#changeSessionId support
• Configuration improvements
• SessionCookieConfig support
• Alignment of Servlet & WebFlux support
• HttpSessionStrategy → HttpSessionIdResolver
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Improvements - Repositories
• Performance improvements
• JdbcOperationsSessionRepository
• HazelcastSessionRepository
• Configuration improvements
• Qualifier annotations for data stores
• Data access components (e.g. RedisTemplate, JdbcTemplate) no
longer registered as beans
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Improvements Demo
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Migrating to Spring Session 2
• Check your dependencies
• spring-session JAR doesn’t exist in 2.0
• spring-session-data-mongo → spring-session-data-mongodb
• Adapt to core API changes
• Session, SessionRepository
• Adapt to session resolution changes
• HttpSessionStrategy → HttpSessionIdResolver
• removed support for multiple sessions in a single browser
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Custom Session Repository
• Core Spring Session infra is easy to reuse
• @EnableSpringHttpSession & @EnableSpringWebSession
• Implementing session repository
• Beware of race conditions - optimize session writes
• Take care to purge the expired sessions
• Support session event publishing, if possible
• Provide supporting configuration classes
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Custom Session Repository Demo
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Contribute to Spring Session
• Issue tracker
• https://github.com/spring-projects/spring-session/issues
• Gitter chat
• https://gitter.im/spring-projects/spring-session
• Stack Overflow tag
• https://stackoverflow.com/questions/tagged/spring-session
• From Zero to Open Source Hero @ Spring I/O 2017
• https://www.youtube.com/watch?v=D7OJFWNx-ks
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Related Talks
• Under the Hood of Reactive Data Access
• Thursday @ 17:30
• Spring Boot 2.0 Web Applications
• Friday @ 9:00
• Next Generation OAuth Support with Spring Security 5
• Friday @ 17:00
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THANKS!
Q & A
Vedran Pavić
@vedran_pavic