Which Open‑Source Workflow Engine Wins? Camunda vs Flowable vs Activiti Deep Dive

Overview of Major Open‑Source BPM Engines

Osworkflow : Lightweight state‑machine engine with minimal tables. Supports steps, conditions, loops, splits, joins. Lacks built‑in countersign, jumps, rollbacks, add‑sign – requires custom extensions. No active maintenance.

Official site: http://www.opensymphony.com/osworkflow/

JBPM : Originated from JBoss. Versions 5+ diverged from JBPM 4 and are based on Drools Flow, which sees limited adoption. JBPM 4 is outdated; later versions are not recommended for new projects.

Official site: https://www.jbpm.org/

Activiti : Developed by Alfresco. Major branches are Activiti 5, 6 (no longer maintained) and Activiti 7 (core still based on Activiti 6, adds few upper‑layer features). Choose with caution.

Official site: https://www.activiti.org/

Flowable : Fork of Activiti 6 (v6.6.0 is the latest stable release). Fixes many Activiti 6 bugs and adds DMN, BPEL, and a Form engine. Open‑source edition is actively maintained; commercial edition provides extra features.

Official site: https://flowable.com/open-source/

Camunda : Based on Activiti 5 and retains the PVM engine. Current stable version 7.15 (two minor releases per year). Provides BPMN, CMMN, DMN, plus robust modeling, task, and monitoring tools in the open‑source edition.

Official site: https://docs.camunda.org/manual/7.15/introduction/

Functional Comparison – Flowable vs Camunda

Camunda supports process‑instance migration across versions; Flowable does not.

Camunda retains PVM compatibility, making migration from Activiti 5 straightforward; Flowable lacks PVM.

Camunda provides built‑in permission checks for every command class; Flowable lacks this feature.

Camunda offers batch APIs for bulk operations (e.g., suspend/activate processes); Flowable requires manual iteration.

Camunda can start a process instance from any node; Flowable can start only from the initial node.

Camunda allows arbitrary node jumps with optional listener triggering; Flowable needs custom extensions.

Camunda implements a dual‑asynchronous mechanism (asynchronous task execution and asynchronous continuation of outgoing flows); Flowable supports only the first.

Camunda includes out‑of‑the‑box support for multiple scripting languages (Python, Ruby, Groovy, JUEL); Flowable supports only JUEL and Groovy.

Camunda provides external tasks that wait for external systems before proceeding, enabling reliable distributed transactions; Flowable’s httpTask proceeds immediately.

Camunda persists user‑specific query preferences for personalized task filtering.

Camunda offers bulk deletion or migration of historical data (e.g., to Elasticsearch); Flowable lacks this capability.

Camunda includes optional locking mechanisms for high‑concurrency deployments; Flowable does not.

Camunda supports multi‑engine and multi‑database configurations; Flowable supports only a single engine with multiple combinations.

Camunda enables cross‑process‑definition instance jumps; Flowable does not.

Camunda provides distributed timers; Flowable does not.

Flowable integrates with NoSQL databases; Camunda offers only a NoSQL‑oriented solution.

Camunda includes built‑in performance‑bottleneck analysis tools; Flowable lacks such tooling.

Camunda’s XML parsing is optimized for better throughput compared with Flowable’s approach.

Camunda allows adding arbitrary attributes to any BPMN node without custom code; Flowable requires extensions.

Camunda does not expose an API for generating process‑diagram images (visualization is handled on the front‑end); Flowable (and older Activiti versions) provide image‑generation APIs.

Camunda supports priority settings for jobs at both node and global levels; Flowable lacks priority configuration.

Camunda enables tagging of processes for easier management; Flowable does not.

Both engines do not support Chinese domestic databases such as Kingbase or DM.

Flowable supports LDAP/OpenLDAP; Camunda does not.

Performance Comparison

Benchmark tests conducted by the author show that Camunda outperforms Flowable by 10 %–39 % in throughput and exhibits higher stability under high‑concurrency loads. Flowable displayed occasional errors during the same tests.

Performance test details: https://lowcode.blog.csdn.net/article/details/109030329

Recommendation

For new projects, the author recommends using Camunda together with the bpmn-js designer. Camunda offers superior functionality, better performance, and higher stability compared with Flowable, Activiti, and other listed engines.