* 定义在processes 目录下的流程会自动部署。 * 文件后缀可以是 `.bpmn20.xml`或者`.bpmn` ## ``` Parameter 0 of method userGroupManager in org.activiti.core.common.spring.identity.config.ActivitiSpringIdentityAutoConfiguration required a bean of type 'org.springframework.security.core.userdetails.UserDetailsService' that could not be found. ```