Incompatible types. Required List but 'query' was inferred to T: no instance(s) of type variable(s) exist so that Teacher conforms to List

问题：Incompatible types. Required List<Teacher> but 'query' was inferred to T: no instance(s) of type variable(s) exist so that Teacher conforms to List<Teacher>

不兼容的类型。必需的List<Teacher>但是'query'被推断为T:不存在类型变量的实例，因此Teacher符合List<Teacher>

 

 解决方法：

List<Teacher> teachers= (List<Teacher>) 
queryRunner.query(DbUtils.getConnection(),"select * from teacher;",new BeanHandler<Teacher>(Teacher.class));