Petri net simulator in Java. There are number of examples and source codes in this simulator

速度非常快、轻量级的引擎，使用富有表达能力的Petri网定义工作流，不要求关系数据库，使用简单，能和Java应用集成。事实上，它是按嵌入式设计的-Bossa is a workflow engine written in Java. The engine is very fast and lightweight, uses a very expressive Petri net notation to define workflows, does not require a RDBMS and