数据有值.为什么报空指针呢java.lang.NullPointerException

Question

java.lang.NullPointerException
at IdCard.Web.Poject.Action.InsertAction.execute(InsertAction.java:252)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:619)

Answer 1

代码如下.
package IdCard.Web.Poject.Action;import java.util.List;import IdCard.Web.Poject.Dao.Selects;
import IdCard.Web.Poject.Model.Recruitment;import com.opensymphony.xwork2.ActionSupport;public class InsertAction extends ActionSupport {
public  String name;
boolean result=false;
public String getName(){
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLinkAddr() {
return LinkAddr;
}
public void setLinkAddr(String linkAddr) {
LinkAddr = linkAddr;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;

}
public String getDateOfBirth() {
return DateOfBirth;
}
public void setDateOfBirth(String dateOfBirth) {
DateOfBirth = dateOfBirth;
}
public String getNational0() {
return National0;
}
public void setNational0(String national0) {
National0 = national0;
}
public String getIDCardNo() {
return IDCardNo;
}
public void setIDCardNo(String iDCardNo) {
IDCardNo = iDCardNo;
}
public String getNativePlace() {
return NativePlace;
}
public void setNativePlace(String nativePlace) {
NativePlace = nativePlace;
}
public String getTSRY() {
return TSRY;
}
public void setTSRY(String tSRY) {
TSRY = tSRY;
}
public String getNianling() {
return nianling;
}
public void setNianling(String nianling) {
this.nianling = nianling;
}
public String getEmployeeNo() {
return EmployeeNo;
}
public void setEmployeeNo(String employeeNo) {
EmployeeNo = employeeNo;
}
public String getCompany() {
return Company;
}
public void setCompany(String company) {
Company = company;
}
public String getDepart() {
return Depart;
}
public void setDepart(String depart) {
Depart = depart;
}
public String getSchool() {
return School;
}
public void setSchool(String school) {
School = school;
}
public String getTeam() {
return Team;
}
public void setTeam(String team) {
Team = team;
}
public String getPoliBGround() {
return PoliBGround;
}
public void setPoliBGround(String poliBGround) {
PoliBGround = poliBGround;
}
public String getWHCD() {
return WHCD;
}
public void setWHCD(String wHCD) {
WHCD = wHCD;
}
public String getWeight() {
return Weight;
}
public void setWeight(String weight) {
Weight = weight;
}
public String getSpecName() {
return SpecName;
}
public void setSpecName(String specName) {
SpecName = specName;
}
public String getPosition() {
return Position;
}
public void setPosition(String position) {
Position = position;
}
public String getSalary() {
return Salary;
}
public void setSalary(String salary) {
Salary = salary;
}
public String getWages() {
return Wages;
}
public void setWages(String wages) {
Wages = wages;
}
public String getTryPeriod() {
return TryPeriod;
}
public void setTryPeriod(String tryPeriod) {
TryPeriod = tryPeriod;
}
public String getEntryDutyDate() {
return EntryDutyDate;
}
public void setEntryDutyDate(String entryDutyDate) {
EntryDutyDate = entryDutyDate;
}
public String getLinkTel() {
return LinkTel;
}
public void setLinkTel(String linkTel) {
LinkTel = linkTel;
}
public String getPossShift() {
return PossShift;
}
public void setPossShift(String possShift) {
PossShift = possShift;
}
public String getSocialNo() {
return SocialNo;
}
public void setSocialNo(String socialNo) {
SocialNo = socialNo;
}
public List<Recruitment> list;
public List<Recruitment> getList() {
return list;
}
public void setList(List<Recruitment> list) {
this.list = list;
}
public String LinkAddr;
public String sex;
public String DateOfBirth;
public String National0;
public String IDCardNo;
public String NativePlace;
public String TSRY;
public String nianling;
public String EmployeeNo;
public String Company;
public String Depart;
public String School;
public String Team;
public String PoliBGround;
public String WHCD;
public String Weight;
public String Position;
public String Salary;
public String Wages;
public String TryPeriod;
public String EntryDutyDate;
public String LinkTel;
public String PossShift;
public String SocialNo;
public String SpecName;
public String FZJG;
public String resulttwo;
public String getFZJG() {
return FZJG;
}
public void setFZJG(String fZJG) {
FZJG = fZJG;
}
public String yxrq;
public String getYxrq() {
return yxrq;
}
public void setYxrq(String yxrq) {
this.yxrq = yxrq;
}
public String execute()
{
try
{


Recruitment recruitment=new Recruitment();
recruitment.Company=(this.getCompany());
recruitment.DateOfBirth=(this.getDateOfBirth());
recruitment.Depart=(this.getDepart());
recruitment.EmployeeNo=(this.getEmployeeNo());
recruitment.EntryDutyDate=(this.getEntryDutyDate());
recruitment.FZJG=(this.getFZJG());
recruitment.IDCardNo=(this.getIDCardNo());
recruitment.LinkAddr=(this.getLinkAddr());
recruitment.LinkTel=(this.getLinkTel());
recruitment.name=(this.getName());
recruitment.National0=(this.getNational0());
recruitment.NativePlace=(this.getNativePlace());
recruitment.nianling=(this.getNianling());
recruitment.PoliBGround=(this.getPoliBGround());
recruitment.Position=(this.getPosition());
recruitment.PossShift=(this.getPossShift());
recruitment.Salary=(this.getSalary());
recruitment.School=(this.getSchool());
recruitment.sex=(this.getSex());
recruitment.SocialNo=(this.getSocialNo());
recruitment.SpecName=(this.getSpecName());
recruitment.Team=(this.getTeam());
recruitment.TryPeriod=(this.getTryPeriod());
recruitment.TSRY=(this.getTSRY());
recruitment.Wages=(this.getWages());
recruitment.Weight=(this.getWeight());
recruitment.WHCD=(this.getWHCD());
recruitment.yxrq=(this.getYxrq());
list.add(recruitment);
 result=Selects.inserts(list);
}catch(Exception e)
{
e.printStackTrace();
}
if(result==false)
{
resulttwo="插入数据失败";
return "error";
}
else
{
resulttwo="插入数据成功";
return "success";
}

}


}

Answer 2

来人啊   http://topic.csdn.net/u/20110816/09/127b2844-8fc1-4d47-8418-86c37795a7e6.html

Answer 3

list.add(recruitment);
是在这一步出错的.我也把不知道为什么..recruitment是有值的.
但是到了这一步.再往下调试.就报空值了.

Answer 4

那你看你的list 是不是初始化了？

Answer 5

InsertAction.java:252错误
list 貌似是null吧。没见new

Answer 6

list.add(recruitment);这行报错，那肯定是list为null啦，拿空的引用来使用才会抛出java.lang.NullPointerException啊

Answer 7

谢谢大家..真的是因为没有NEW..所以才报空值,太粗心了.