JbpmConfiguration：configuration of one jBPM instance.
JbpmContext：is used to surround persistent operations to processes.
ProcessDefinition：
ProcessInstance：is one execution of a
ProcessDefinition. To create a new process execution of a process definition, just use the
ProcessInstance(ProcessDefinition).
ContextInstance：maintains all the key-variable pairs for a process instance
TaskMgmtSession:
?????????????????????????????????findTaskInstances(java.lang.String?actorId)?
??????????????????????????????????get the tasllist for a given actor.（根據角色得到此角色的任務列表）
?????????????????????????????????
loadTaskInstance(long?taskInstanceId)?
??????????????????????????????????get the task instance for a given task instance-id.（根據實例ID獲得任務實例）
TaskInstance:???
?????????????????????????????????end() marks this task as done.
?????????????????????????????????
end(java.lang.String?transitionName)?
??????????????????????????????????marks this task as done and specifies the name of a transition leaving the task-node for the case that the completion of this task instances triggers a signal on the token.