使用spring构建一个简单的工作流引擎，便于初学者了解工作流引擎的开发模式。-The API discussed here is bundled as the main source code under the src/java directory. Three unit tests exist in the src/testdirectory including SimpleSequenceTestCase, RateDropTestCase and PoolingTes

# Set root logger level to DEBUG and its only appender to A1. log4j.rootLogger=DEBUG, A1 # A1 is set to be a ConsoleAppender. log4j.appender.A1=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out