Question

spring注入提示空指针异常，求指点

public class UserAction extends BaseAction<User>{
UserDaoImpl userImpl;
public void setUserImpl(UserDaoImpl userImpl) {
this.userImpl = userImpl;
public String find(){
User user=userImpl.find(hql);
return "loginSuccess"; }
}

spring里配置文件包括下面的部分
<bean id="userDaoImpl" class="com.bo.daoImpl.UserDaoImpl">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="userAction" class="com.bo.action.UserAction" >
<property name="userImpl" ref="userDaoImpl"></property>
</bean>

提示如下空指针
java.lang.NullPointerException
com.bo.action.UserAction.find(UserAction.java:37)

Answer 1

使用的bean是 userImpl；

配置的是 userDaoImpl；

把两个名字改成一样的