Hi, Correct me if I am wrong but it seems I found possible inconsistency in the activiti-bpmn-converter-5.12.jar. Please take a look on sources and jar from https://maven.alfresco.com/nexus. Open org.activiti.bpmn.converter.BpmnXMLConverter and find method public BpmnModel convertToBpmnModel(InputStreamProvider inputStreamProvider, boolean validateSchema) - it looks ok in the sources (actually https://github.com/Activiti/Activiti/blob/activiti-5.12/modules/activiti-bpmn-converter/src/main/jav... looks similar) but jar file does not have this method - it seems to have method from master with 2 boolean args.
Tijs, Please also pay attention on the same problem with dates for activiti-engine itself. Also activiti-webapp-explorer2-5.12, activiti-explorer-5.12, activiti-bpmn-model-5.12. Did not check disigner stuff.