package org.steelam.base;
import java.util.*;import org.steelam.beans.Team;
import org.steelam.dao.EmployeeDao;
import org.steelam.daoImpl.EmployeeDaoImpl;
import org.steelam.model.service.EmployeeService;
import org.steelam.serviceImpl.EmployeeServiceImpl;/** 供JSON-RPC组件远程调用的AjaxBean */
public class AjaxBean extends BaseLog implements java.io.Serializable { /**
*
*/
private static final long serialVersionUID = 1L; /**取得班组列表*/
public String[][] getTeam(){
String[][] options = null;
EmployeeDao em=new EmployeeDaoImpl();
try{
List list = em.getTeams();
Team team =null;
int i = 0;
if (list!=null){
options = new String[list.size()][2];
Iterator it = list.iterator();
while(it.hasNext()){
team = (Team)it.next();
options[i][0] =team.getId().toString();
options[i][1] =team.getTeamName().trim();
i++;
}
}else{
options = new String[1][2];
options[0][0] ="0";
options[0][1] ="无班组";
}
}catch(Exception ex){
logger.info("在执行AjaxBean类中的getTeam方法时出错:\n");
ex.printStackTrace();
}
return options;
}
public static void main(String[] args){
AjaxBean ax= new AjaxBean();
ax.getTeam();
System.out.println("@@@@@@@@@@@@@@@@@");
}
}运行Main方法后,出现以下提示:
2009-03-25 19:12:59 [日志信息] 在执行AjaxBean类中的getTeam方法时出错:@@@@@@@@@@@@@@@@@
java.lang.NullPointerException
at org.steelam.daoImpl.EmployeeDaoImpl.getTeams(EmployeeDaoImpl.java:52)
at org.steelam.base.AjaxBean.getTeam(AjaxBean.java:25)
at org.steelam.base.AjaxBean.main(AjaxBean.java:52)
请问哪儿出现了空指针呢?
import java.util.*;import org.steelam.beans.Team;
import org.steelam.dao.EmployeeDao;
import org.steelam.daoImpl.EmployeeDaoImpl;
import org.steelam.model.service.EmployeeService;
import org.steelam.serviceImpl.EmployeeServiceImpl;/** 供JSON-RPC组件远程调用的AjaxBean */
public class AjaxBean extends BaseLog implements java.io.Serializable { /**
*
*/
private static final long serialVersionUID = 1L; /**取得班组列表*/
public String[][] getTeam(){
String[][] options = null;
EmployeeDao em=new EmployeeDaoImpl();
try{
List list = em.getTeams();
Team team =null;
int i = 0;
if (list!=null){
options = new String[list.size()][2];
Iterator it = list.iterator();
while(it.hasNext()){
team = (Team)it.next();
options[i][0] =team.getId().toString();
options[i][1] =team.getTeamName().trim();
i++;
}
}else{
options = new String[1][2];
options[0][0] ="0";
options[0][1] ="无班组";
}
}catch(Exception ex){
logger.info("在执行AjaxBean类中的getTeam方法时出错:\n");
ex.printStackTrace();
}
return options;
}
public static void main(String[] args){
AjaxBean ax= new AjaxBean();
ax.getTeam();
System.out.println("@@@@@@@@@@@@@@@@@");
}
}运行Main方法后,出现以下提示:
2009-03-25 19:12:59 [日志信息] 在执行AjaxBean类中的getTeam方法时出错:@@@@@@@@@@@@@@@@@
java.lang.NullPointerException
at org.steelam.daoImpl.EmployeeDaoImpl.getTeams(EmployeeDaoImpl.java:52)
at org.steelam.base.AjaxBean.getTeam(AjaxBean.java:25)
at org.steelam.base.AjaxBean.main(AjaxBean.java:52)
请问哪儿出现了空指针呢?
这行
AjaxBean.java:25
在你EmployeeDaoImpl.java 第52行啊兄弟,出错了
你可以点击 一下 它自动会链接到该页面
找到错误的那行。
以后就可以这样了
希望可以帮助你哦
^_*
import java.util.*;import org.steelam.beans.Team;
import org.steelam.dao.EmployeeDao;
import org.steelam.daoImpl.EmployeeDaoImpl;
import org.steelam.model.service.EmployeeService;
import org.steelam.serviceImpl.EmployeeServiceImpl;/** 供JSON-RPC组件远程调用的AjaxBean */
public class AjaxBean extends BaseLog implements java.io.Serializable {
private EmployeeService employeeService;
// 进行依赖注入
/**
* @return the employeeService
*/
public EmployeeService getEmployeeService() {
return employeeService;
}
public void setEmployeeService(EmployeeService employeeService) {
this.employeeService = employeeService;
}
/**
*
*/
private static final long serialVersionUID = 1L; /**取得班组列表*/
public String[][] getTeam(){
String[][] options = null;
try{
List list = this.employeeService.getTeams();
Team team =null;
int i = 0;
if (list!=null){
options = new String[list.size()][2];
Iterator it = list.iterator();
while(it.hasNext()){
team = (Team)it.next();
options[i][0] =team.getId().toString();
options[i][1] =team.getTeamName().trim();
i++;
}
}else{
options = new String[1][2];
options[0][0] ="0";
options[0][1] ="无班组";
}
}catch(Exception ex){
logger.info("在执行AjaxBean类中的getTeam方法时出错:\n");
ex.printStackTrace();
}
return options;
}
public static void main(String[] args){
AjaxBean ax= new AjaxBean();
ax.getTeam();
System.out.println("@@@@@@@@@@@@@@@@@");
}}
代码换成注入后 再运行main方法 得到如下提示:2009-03-25 20:17:22 [日志信息] 在执行AjaxBean类中的getTeam方法时出错:@@@@@@@@@@@@@@@@@
java.lang.NullPointerException
at org.steelam.base.AjaxBean.getTeam(AjaxBean.java:36)
at org.steelam.base.AjaxBean.main(AjaxBean.java:63)也就是说getTeam方法没执行。可是getTeam方法本身是没有问题的,那么,也就是说没有调用getTeam方法。是为什么呢,是不是需要在配置文件中配置和EmployeeService的依赖关系啊?