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Workshop 1: Distributed Session Management

Learn how to solve the problem of lost sessions using Redis and Spring Session.

What You'll Learn

  • Why in-memory sessions break in production
  • How to configure Spring Session with Redis
  • How sessions persist across application restarts

Run with Docker

cd java-springboot/workshop-hub

# Start the hub, Redis, and workshop 1
docker compose -f docker-compose.local.yml --profile infrastructure up -d
docker compose -f docker-compose.local.yml --profile workshop-1_session_management up -d

Open http://localhost:9000 and launch the Session Management workshop from the Hub.

Login: user / password

Workshop Flow

Stage What You Do
1. See the Problem Login, restart the workshop backend, observe session loss
2. Fix It Update the 3 editable files listed below
3. Verify Rebuild and restart the workshop backend, then confirm the session survives

Editable Files And Tasks

1. build.gradle.kts

Uncomment the Redis dependencies:

implementation("org.springframework.boot:spring-boot-starter-data-redis")
implementation("org.springframework.session:spring-session-data-redis")

2. src/main/resources/application.properties

Enable Redis-backed session storage:

spring.session.store-type=redis
spring.session.redis.namespace=spring:session
spring.session.redis.flush-mode=immediate
spring.session.redis.repository-type=default

3. src/main/java/com/redis/workshop/session/config/SecurityConfig.java

Uncomment the HttpSessionSecurityContextRepository import, the SecurityContextRepository bean, and the securityContext(...) filter-chain wiring.

Verify The Fix

  1. Log in and note the current session ID.
  2. Restart the workshop backend from the Hub without rebuilding and confirm the session is lost.
  3. Make the three code changes above.
  4. Rebuild and restart the workshop backend from the Hub.
  5. Refresh the workshop and confirm you stay logged in with the same session ID.

View Sessions In Redis Insight

Use the Open Redis Insight action inside the workshop, or open http://localhost:5540 directly.

Search for:

spring:session:*

Stopping

docker compose -f docker-compose.local.yml --profile workshop-1_session_management down

Resources