I have a SpringBoot project with activity 6, but when deploying I have this error:
Caused by: org.activiti.engine.ActivitiException: couldn't upgrade db schema: alter table ACT_RE_PROCDEF add (ENGINE_VERSION_ NVARCHAR2(255))
Check wich version of activiti engine you use in maven dependencies.
Check version in your db table ACT_GE_PROPERTY and org.activiti.engine.ProcessEngine.VERSION. They need match.