The app deploys successfully. All existing deployments are marked as activiti-5. I am able to start a new process and complete tasks only when no custom form types are used. When there is a custom form type, I get the "unknown type" exception.
After debugging, I found out that my customFormTypes property was picked up successfuly during the initialization by the org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl (that is v6.) But in the v5 file org.activiti5.engine.impl.cfg.ProcessEngineConfigurationImpl the customFormTypes is null. Why is it not picking it up form my engine configuration setting? Am I missing something in my setup?