Activiti 5.20.0 发布了， 这是一个Bug修复版本。改进记录如下： mainly fixing the bug around losing message and signal start event subscriptions on process definition redeployment, see ACT-4117 Bug [ACT-2163] - Fix some bugs and optimize display on text in workflow drawing [ACT-4051] - Spring Boot support does not discover processes in external JARs [ACT-4097] - Subprocess start events not present in historic activity instance list [ACT-4101] - NPE when there are multiple routes to terminateEndEvent, and both are reached [ACT-4109] - Database exception when using both processInstanceId and executionId on HistoricVariableInstanceQuery [ACT-4112] - Subscribed Event Deleted after the related process is redeployed (MySQL database) [ACT-4117] - Signal and Boundary event subscription are lost when deploying a new process definition version [ACT-4118] - Signal and Message start event are not restored when deleting the latest version of a deployment [ACT-4119] -Stale ProcessDefinition cache when modifying the suspensionState [ACT-4130] - Unused assignment and possible integer overflow [ACT-4131] - Message events are not restored after deployment for processes with tenant id [ACT-4137] - Historic process instance endTime not set when using terminate end event Task [ACT-4091] - Tasks list empty in executionEntity [ACT-4104] - Boundary message event isn't exported Improvement [ACT-4064] - Missing some search filters in "Get historic task instances" REST service 下载地址：https://github.com/Activiti/Activiti/releases/tag/5.20.0 Activiti 5.20.0 发布，业务流程管理下载地址
