- We introduced bulk inserts. For more information you can read more about it in this blog post http://www.jorambarrez.be/blog/2015/07/20/the-activiti-performance-showdown-2015/
- We enhanced the OR query support, it's now possible to use multiple OR parts in one query
- Improvements to the async executor we introduced in Activiti 5.17.0. There were some cases that could result in deadlock exceptions and that's resolved in this version.
- Improvements to the Activiti Modeler with terminate end events, cancel event and transaction support, and more intermediate catch and throw event support. Also, improvements to interrupting and non-interrupting solid and dashed line for boundary events.
- Upgraded Spring dependency version to 4.1. Activiti is still working with Spring 4.0.x and 3.x as well.
- Various bug fixes
More information can be found in the Release notes