where is document variable's files store ?
There are two ways that documents can be part of a process. The document is stored differently for each way.
1) The document can be declared to be internal to the process. In this case the document itself is written to the Bonita Execution Engine database with other process variables.
2) The document can be declared to be external to the process. In this case, the document is specified by a URI and it is this URI and not the document itself that is stored in the Bonita Execution Engine's database.
If you would like more information about how documents are treated within processes, please refer to our online documentation at http://documentation.bonitasoft.com.