We have requirements to generate a new Activiti Process when information is entered into a web service. How can I trigger a new process instance (with certain variables pre-populated) from the external code?
Activiti has a rich set of REST APIs which you can use to start process instances. The APIs are documented in both the community documentation as well as in the enterprise documentation which you can refer depending on the product which you are using. I was able to find a thread where I provided a quick overview of those APIs - Difference between runtime/enterprise/repository/app API
Hope this helps.
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