Following is the sample code of how to start a JBPM process instance.

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/ **
  * Start a process instance.
  *
  * @ Param name
  *   Process name.
  * @ Param version
  *   Version number, default is the latest version.
  * @ Param formID
  *   Business-related form number ,optional field.
  *   The meaning of the parameter is: after filling the form, the process uses the ID as the process instance variable.
  *   It was Saved in the workflow system, so the form data can be obtained from business information with the ID.
  * @ Param actor
  *   	Sponsor of the process.
  * @ Return instance
  *   ID No. + task instance ID (if any), the format 'ID No.-task instance ID'.
  * /
    public String startProcessInstance(String name, int version, String formID,
            String actor);
        jbpmContext = jbpmConfiguration.createJbpmContext();
        try {
            ProcessDefinition def;
            if (version == 0) {
                def = jbpmContext.getGraphSession().findLatestProcessDefinition(name);
            } else {
                def = jbpmContext.getGraphSession().findProcessDefinition(name,version);
            }
            ProcessInstance instance = new ProcessInstance(def);            
            TaskInstance taskInstance = instance.getTaskMgmtInstance().createStartTaskInstance();                
 
            if ((formID != null) && (!formID.equals("")))
                instance.getContextInstance().setVariable(
                         name + "-" + version + "-"+ instance.getId()+ "-Form", formID);
            jbpmContext.save(instance);
            String rtn = String.valueOf(instance.getId());
 
            //if any task instance
            if (taskInstance != null){
                taskInstance.setActorId(actor);
                rtn += "-"+ String.valueOf(taskInstance.getId());
            }else{
                instance.getRootToken().signal();
            }
            return rtn;
        } catch (Exception e) {
            e.printStackTrace();
            log.error(e.getMessage());
        } finally {
            jbpmContext.close();
        }
        return "";
    }