关于webwork项目中java.lang.NullPointerException问题

Question

谢谢，我调试没有错误。还有ID应该也不存在问题我用的是JAVA的UUID生成的。
我调试、测试都没有问题的。所以不知道问题所在？

Answer 1

好的。
action:
/*
 * This project is ghx
 * Created on 2007-1-10 下午02:30:37                                          
 * File is Applay4counterbillAddAction.java
 */package com.gionee.action.applay4counterbill;
import java.util.List;import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;import com.gionee.action.BaseActionSupport;
import com.gionee.common.Constants;
import com.gionee.common.util.GeneralUtil;
import com.gionee.common.util.LoggerUtil;
import com.gionee.ghx.facade.BusinessAgentFacade;
import com.gionee.ghx.facade.CityFacade;
import com.gionee.ghx.facade.applay.Applay4counterbillFacade;
import com.gionee.ghx.help.BusinessAgentHelper;
import com.gionee.ghx.help.CityHelper;
import com.gionee.ghx.vo.Applay4counterbill;
import com.gionee.ghx.vo.AuthUser;
import com.gionee.ghx.vo.BusinessAgent;
import com.gionee.ghx.vo.UserSession;
import com.opensymphony.xwork.ActionContext;
/**
 * @author 
 */public class Applay4counterbillAddAction extends BaseActionSupport { /**
 * 
 */
private static final long serialVersionUID = -5493210177483110447L; private static final Log log=LogFactory.getLog(Applay4counterbillAddAction.class);

private Applay4counterbill applay4counterbill;

private List applay4counterbilldetails;

private List citys;

private List stores;

/**
 * 
 */
public String execute() throws Exception{
AuthUser authUser = ((UserSession)ActionContext.getContext().getSession().get(Constants.USER_SESSION)).getAuthUser();
//查询所属总代
BusinessAgent businessAgent=new BusinessAgentFacade().findById(" select agentId,provinceId,provinceName "+new BusinessAgentHelper().getSqlString()+" and agentId='"+authUser.getAgentId()+"'","agentId,provinceId,provinceName");
//城市区域
citys=new CityFacade().find("select "+CityHelper.City_Fields+new CityHelper().getSqlString()+" and agentId='"+businessAgent.getAgentId()+"'",CityHelper.City_Fields);
     return "add";
}

/***
 * 展柜制作申请保存
 * @return
 * @throws Exception
 */
public String doSave() throws Exception {
//key
String uuid=GeneralUtil.UUID();
try{
Applay4counterbillFacade facade=new Applay4counterbillFacade();
AuthUser authUser = ((UserSession)ActionContext.getContext().getSession().get(Constants.USER_SESSION)).getAuthUser();
applay4counterbill.setApplaybillId(uuid);
log.info("applaybillId: "+applay4counterbill.getApplaybillId());
applay4counterbill.setCreateDate(new java.util.Date());
applay4counterbill.setCreatePerson(authUser.getUserId());
applay4counterbill.setCreatePersonName(authUser.getUserName());
applay4counterbill.setAgentId(authUser.getAgentId());
applay4counterbill.setAgentName(authUser.getAgentName());
applay4counterbill.setAgentSort(authUser.getAgentSort());
facade.save(applay4counterbill);
this.setMessage("新增展柜制作申请成功！");
this.setContinueUri("Applay4counterbillFormView.htm?applaybillId="+applay4counterbill.getApplaybillId());
}
catch(Exception e){
this.setMessage("新增展柜制作申请失败！");
this.setReturnUri("Applay4counterbillFormList.htm");
LoggerUtil.error(this.getClass(), getMessage(), e);
return ERROR;
}
return SUCCESS;
}
get和set属性
Facade层（service）就是调用DAO层的insert
public void save(Applay4counterbill applay4counterbill) throws Exception
{
DbConnection dbconn = new DbConnection();
try
{
dbconn.begin();
  applay4counterbillDAO.insert(applay4counterbill, dbconn);
dbconn.commit();
}
catch(Exception e)
{
e.printStackTrace();
log.error("新增失败！");
dbconn.rollback();
throw e;
}
finally
{
if(dbconn!=null)dbconn.closed();
}
}
DAO层：
public void insert(Applay4counterbill applay4counterbill,DbConnection dbconn) throws java.sql.SQLException {
try {
String fields = helper.getFields(applay4counterbill);
String sql = helper.createInsertSql(fields);
dbconn.buildPreparedStatement(sql);
helper.pstmtInsert(applay4counterbill, dbconn.getCurrentPstmt(), fields);
dbconn.getCurrentPstmt().execute();
}
catch(Exception e) {
e.printStackTrace();
log.error("新增失败！");
throw new java.sql.SQLException();
}
}
还有help类是我包数据库表SQL装换