大神们帮忙啊
SSH整合 struts2+spring2.5.6+hibernate3.3 Myeclipse+tomc7+JDK7
只先实现登陆功能 但提交后报空指针异常
The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
cn.service.impl.PersonServiceImpl.personLogin(PersonServiceImpl.java:20)
cn.action.PersonAction.execute(PersonAction.java:42)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
PersonDao.java
import org.springframework.transaction.annotation.Transactional;
import cn.dao.CenericDao;
import cn.vo.Person;
@Transactional
public interface PersonDao extends CenericDao<Person, Integer>{
@Transactional(readOnly=true)
public Person personLogin(String name, String password);
}
PersonDaoImpl.java
public class PersonDaoImpl extends CenericDaoImpl<Person, Integer> implements PersonDao{
@SuppressWarnings("unchecked")
public Person personLogin(String name, String password) {
String hql = "from Person as p where p.name=? and p.password=?";
List<Person> person = getHibernateTemplate().find(hql, new Object[]{name, password});
if(person.size() > 0){
return (Person)person.get(0);
}else{
return null;
}
}
}
PersonService.java
@Transactional
public interface PersonService {
@Transactional(readOnly=true)
public Person personLogin(String name, String password);
public void changePassword(Integer id, String newPassword);
}
PersonServiceImpl.java
@Entity
public class PersonServiceImpl implements PersonService {
private PersonDao personDao;
public void setPersonDao(PersonDao personDao) {
this.personDao = personDao;
}
public Person personLogin(String name, String password) {
System.out.println(personDao);
System.out.println(personDao.personLogin(name, password));
return personDao.personLogin(name, password);
}
public void changePassword(Integer id, String newPassword) {
Person user = personDao.findById(id);
user.setPassword(newPassword);
personDao.update(user);
}
}
PersonAction.java
public class PersonAction extends ActionSupport {
private static final long serialVersionUID = -7259987330558645455L;
private PersonService personService;
private Person person;
private String message;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
public void setPersonService(PersonService personService) {
this.personService = personService;
}
public String execute() throws Exception {
personService = new PersonServiceImpl();
person = personService.personLogin(person.getName(), person.getPassword());
if(null != person){
Map<String, Object> session = ActionContext.getContext().getSession();
session.put("person", person);
return SUCCESS;
}
else{
this.setMessage("用户名或密码错误，请从新登录！");
return INPUT;
}
}
[解决办法]
估计是注入没做好。
java.lang.NullPointerException
cn.service.impl.PersonServiceImpl.personLogin(PersonServiceImpl.java:20)
PersonServiceImpl.java 的 20 行是哪行？
我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.myexception.cn/java-web/317.html