ssh封装了基类后出现空指针异常

Question

 

<bean id="baseDao" class="com.iwiz.dao.impl.BaseDaoImpl">
    <property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="noteDao" class="com.iwiz.dao.impl.NoteDaoImpl" parent="baseDao"></bean>

 <bean id="baseService" class="com.iwiz.service.impl.BaseServiceImpl">

   <property name="baseDao" ref="baseDao"></property>
</bean>
<bean id="noteService" class="com.iwiz.service.impl.NoteServiceImpl" parent="baseService">
    <property name="noteDao" ref="noteDao"></property>
</bean>

 public class BaseDaoImpl<T, PK extends Serializable> implements BaseDao<T, PK> {

    private Class<T> entityClass;

    public BaseDaoImpl() {
    this.entityClass = null;
    Class<T> c = (Class<T>) getClass();
    Type type = c.getGenericSuperclass();
    if(type instanceof ParameterizedType) {
        Type[] parameterizedType = ((ParameterizedType)type).getActualTypeArguments();
        this.entityClass = (Class<T>) parameterizedType[0];
    }
    }
    
    public T findById(PK id) {
    return (T) getSession().load(entityClass, id);
    }
}

 public class NoteServiceImpl extends BaseServiceImpl<Note, String> implements NoteService {

    private NoteDao noteDao;

    public void setBaseDao(NoteDao noteDao) {
    super.setBaseDao(noteDao);
    }

    public void setNoteDao(NoteDao noteDao) {
    this.noteDao = noteDao;
    }
}

 tomcat在启动的时候并没有执行红色字体的代码，导致调用findById时entityClass为空值，但是BaseDaoImpl的构造方法已经把所需要的类都通过反射得到了呀，怎么回事呀？怎样才能让tomcat启动就能执行红色字体的代码？我漏了什么配置了还是...？

Answer 1

bean id="noteService" class="com.iwiz.service.impl.NoteServiceImpl" parent="baseService">

改成

bean id="noteService" class="com.iwiz.service.impl.NoteServiceImpl" parent="baseService">

2、
private NoteDao noteDao;

public void setBaseDao(NoteDao noteDao) {
super.setBaseDao(noteDao);
}

}