struts2+hibernate4创建了一个注册系统，本来没问题的，但是整合加入spring之后在注册报空指针异常，在事务提交阶段取到的userId为0.感觉就是在new user()那里出问题，但是一直找不到问题根源,困扰好久，*.hbm.xml，实体类都没问题，就是事务提交主键ID老是提示为0，怎么解决
实体类文件
package com.chengji.ssh.beans;
public class User {
private String username;
private String password;
private int gender;
private int userId;
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 getGender() {
return gender;
}
public void setGender(int gender) {
this.gender = gender;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
}
*.hbm.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
not-null="true" length="16">
not-null="true" length="16" />
length="1" />
