I am newbie in activiti. I am using the Activiti engine using Java application and want to invoke the jsp form when flow reach to User task in order to set the input parameters and submit it. Also how the activiti engine tells the java application that it need to open the jsp form for input when it reaches to the user task.
Activiti can't tell the java application that. What you can do is store the task form key, somehow referencing some jsp page, in the user task.
In your own application, when you show a task list and click on a task you can fetch that form key and use it to fetch and display the form. Later, when submitting the form, call the formService.submit…() method.