Activiti 5.21.0 发布了，更新如下： 亮点
该版本修复了一些重要的bug，并发布了“安全脚本”功能（针对JavaScript），它允许以安全的方式来执行脚本。 it fixes some cases where the end time was
not set for activities in a process definition under certain conditions. A concurrency bug was discovered when using delegateExpressions together with field injection.
Make sure to read the updated documentation section on the use of 'delegateExpression'.
完整更新列表： Bug [ACT-2081] - taskCandidateOrAssigned doesn't work with custom GroupEntityManager and UserEntityManager [ACT-4090] - Boundary timer with fixed number of repeats fires all events at once when attached to nested activity [ACT-4152] - Task Category not included in query result under MS SQL Server 2012 [ACT-4171] - End time incorrectly set on multi-instance subprocess historic activity [ACT-4172] - DelegateExpression usage not thread-safe [ACT-4176] - End time not correctly set on historic activity [ACT-4185] - NullpointerException occured on referring HistoricVariableUpdate(Serializable Type) [ACT-4186] - ConcurrentModificationException when event listener removes itself [ACT-4189] - Process diagram generator: support multiple pools [ACT-4190] - Job with null due date is never picked up again [ACT-4181] - fix or queries containing processDefinitionKey clause eliminated adhoc tasks from result set [ACT-4184] - Fetching historic task with task local and process variables returns current task variables
新特性[ACT-4166] - Support for multiple signal start events [ACT-4167] - Support for multiple timer start events [ACT-4177] - Secure scripting feature [ACT-4179] - Allow to set business calendar on timer event definition [ACT-4180] - Process diagram generator: allow to change font for annotations [ACT-4182] - Query historic variables with a list of execution/task ids [ACT-4183] - Explorer: omitting the protocol (scheme) in order to preserve the protocol of the current page [ACT-4187] - Make variable limit configurable when fetching variables [ACT-4188] - Add support for associations in auto layout and diagram generator
改进新特性[ACT-1963] - Data Object support for Activiti Modeler [ACT-2073] - Document custom identity link feature in User Guide [ACT-2074] - add support for custom identity links to Modeler
详情：http://www.activiti.org/readme.html | 
