What is Eventstore?

Sliceworkz Eventstore is an open source eventstore implementation in Java.

• If’re you’re into eventsourcing, have a look at our quickstart guide and documentation to get started.
• If you’re new to eventsourcing, do yourself a favor and learn about it

Features

• Fully compliant with DCB, the Dynamic Consistency Boundary specification
• Fully typed access to Event via EventStreams
• Event Query capabilities on event Types and Tags
• Optimistic locking on Event appends
• Built-in upcasting of legacy events

Technical

• Pure Java implementation
• Lightweight with minimal dependencies
• Postgres-based database storage — defaults to PostgreSQL 18+ with native server-side uuidv7(), with a legacy fallback path for PostgreSQL 13–17 (auto-detected at startup)
• In-Memory storage for development and unit-testing
• File-persisted in-memory storage for local development without PostgreSQL