Maintaining sessions across different calls to task files via DataAccessObject Java APIs.

We want to maintain the same session across multiple requests to InfoEngine via Data Acess Object API.

What we are trying to do is,  call start-Session present in a task file, get the generated Session ID and instance and pass the same in another request to another task file. 

We are using InfoEngine's Java DataAccessObject API.

We are however, getting "Session doesn't exist" error.