空指针 - ITeye问答

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空指针5

总是报这个错误java.lang.NullPointerException，但是找了好久还是没有搞定，不知那位兄弟能帮我看看package cn.edu.action;

import cn.edu.dao.DAOException;
import cn.edu.dao.impl.Userdao;
import cn.edu.service.UserServices;
import cn.edu.vo.Uservo;

import com.opensymphony.xwork2.ActionSupport;

public class Useraction extends ActionSupport {

public String userName;
public String password;
public int type;
public UserServices userServiceImpl;
public UserServices getUserServiceImpl() {
return userServiceImpl;
}

public void setUserServiceImpl(UserServices userServiceImpl) {
this.userServiceImpl = userServiceImpl;
}

public String addUserInfo(){
Uservo vo=new Uservo();
vo.setPassword(password);

System.out.println("######"+vo.getPassword());

vo.setType(type);
System.out.println("######"+vo.getType());

vo.setUserName(userName);
System.out.println("######"+vo.getUserName());
try {
getUserServiceImpl().addInfo(vo); 这里总报错，调了好久，也不知道是那里出问题了
} catch (DAOException e) {

e.getMessage();
}
return SUCCESS;

}

public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}

}

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2008年6月02日 14:49

tgm923
25
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2个答案按时间排序按投票排序

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同楼上，顺便翻译一把。
可能你的"userServiceImpl"实例没有初始化。

在代码里也没有找到初始化的地方，只是有了个getUserServiceImpl方法。
尝试修改下getUserServiceImpl方法吧：

public void getUserServiceImpl(UserServices userServiceImpl) { 

if(null == userServiceImpl) 
userServiceImpl = new userServiceImpl(); 

return userServiceImpl; 
}

2008年6月17日 17:21

waterdh
627
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maybe your    "userServiceImpl"     hasn't been instance,

And In the show code ,

I never see the Instance place, only show the "getUserServiceImpl" METHOD

try   change your getUserServiceImpl    METHOD

public void getUserServiceImpl(UserServices userServiceImpl) {

     if(null == userServiceImpl)
           userServiceImpl = new userServiceImpl();

     return userServiceImpl;
}