mybatis- Cannot cast from List<Object> to List<Professor>

Cannot cast from List<Object> to List<Professor>

一個簡單的Spring mvc mybatis框架的CRUD實例。但是下面DAOIMPL裡面代碼報錯，改不了首先interface IProfessorDao寫了
public List findAll();

然後IProfessorDaoImpl裡面下面方法報錯

public List findAll()

{

// TODO Auto-generated method stub

String sql = this.getStatementId(Professor.class, SELECTALL);

List list = (List)sqlSession.selectList(sql);
return list;

}
其中(List)sqlSession.selectList(sql); 這裡提示 Cannot cast from List to List
SQLMAPPER設置也沒有問題，代碼如下


select * from ALL_EXP_LIST_TBL ;


求助怎麼解決

最佳回答：

可以改成List list = (List)sqlSession.selectList(sql);試試，List是轉換不成List的