# jcoleman/tomcat-redis-session-manager

Redis-backed non-sticky session store for Apache Tomcat

Repository: https://github.com/jcoleman/tomcat-redis-session-manager
Canonical: https://ross.abutalabs.com/products/tomcat-redis-session-manager
Language: Java
License: MIT
License Family: permissive
Last push: 2023-01-03T13:52:40+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5508, "days_push": 1338, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1777, forks 1100 (observed 2026-08-28T04:05:34.685962+00:00)

## What it is
A Tomcat session manager that stores HTTP sessions in Redis, enabling non-sticky load balancing across a cluster of Tomcat servers. Sessions are written to Redis immediately on modification and rely on Redis key expiration for automatic session expiry.

## Use cases
- distribute Tomcat session state across a cluster without sticky sessions
- share HTTP sessions between multiple Tomcat instances via Redis
- avoid Tomcat's built-in clustering overhead for session replication
- persist sessions so any server can serve any request
- scale a Tomcat web app horizontally behind a load balancer

## When to choose
- you run a Tomcat 6/7 cluster and want non-sticky session distribution
- you already operate Redis and want sessions stored there
- you need sessions available immediately to all servers in the cluster

## When to avoid
- you use Tomcat 8 or newer, which is not supported
- your session data is not Serializable
- you need an actively maintained project with recent development

## Facets
- artifact type: library
- maturity: maintenance
- function: caching, middleware
- domain: databases, web-development
- platform: jvm
- tags: tomcat, redis, session-management, clustering, non-sticky-sessions, devops, web-server

## Member repositories
- jcoleman/tomcat-redis-session-manager (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:34.685962+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:25:13.079599+00:00, confidence not recorded.
  - readme: https://github.com/jcoleman/tomcat-redis-session-manager (fetched 2026-08-28T04:05:34.685962+00:00, sha 1daeaa273845)
- Data as of 2026-08-30T08:39:29.467469+00:00.