I was a little insecure because CDI is considered as experimental in the Activiti User Guide and I could not find any reliable statements in this forum if CDI can be used in productional environments. So, has anyone any experience with it?
You can consider the CDI module to be non-experimental. We'll update this in the user guide for the next release. Of course this doesn't mean that you can't run into bugs. But that's where JIRA is for.