Self-Hosted Event Bus Libraries: EventBus vs Guava vs MBassador vs Otto — In-Process Pub-Sub Comparison

Sun, 21 Jun 2026 00:00:00 +0000

Introduction

When building complex server-side applications, managing communication between components without tight coupling is a fundamental challenge. While message brokers like RabbitMQ and NATS handle inter-service communication, in-process event buses solve a different problem: enabling decoupled communication between components within the same application process.

In-Process on Pi Stack

Self-Hosted Event Bus Libraries: EventBus vs Guava vs MBassador vs Otto — In-Process Pub-Sub Comparison

Introduction