Free / OpenSource Java Rules / Workflow engine

Question

I am looking for a Java Rules / Workflow engine. Something similar to Microsoft Workflow Engine.

Can someone recommend a product?

Answer 1

• jBPM: aimed at business processes mostly;
• OSWorkflow: pretty low-level; and
• Spring Webflow: not a generic workflow engine but a notworthy product if you ever need to implemented a flow-based Web application.

Nothing quite up there with WWF.

Answer 2

Here is a rundown of many open-source Java rules engines including the usual suspects like Drools, etc.