public void saveNewUser(UserDTO userDTO){
      try{
         Session session =getSessionFactory().getCurrentSession();
         session.save(userDTO);
      }catch(HibernateException ex){
         throw new HibernateException(ex);
      }
   }

<beans:bean id="transactionManager"
      class="org.springframework.orm.hibernate3.HibernateTransactionManager">
      <beans:property name="sessionFactory" ref="sessionFactory" />
   </beans:bean>

<beans:bean id="userTransactionProxy"
      class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
      <beans:property name="transactionManager" ref="transactionManager" />
      <beans:property name="transactionAttributes">
         <beans:props>
            <beans:prop key="*">PROPAGATION_REQUIRED</beans:prop>
         </beans:props>
      </beans:property>
      <beans:property name="target">
         <beans:ref bean="userDAO" />
      </beans:property>
   </beans:bean>

Hibernate: select userdto0_.UserId as UserId0_, userdto0_.UserName as UserName0_, userdto0_.UserSchoolId as UserScho3_0_, userdto0_.UserPassword as UserPass4_0_, userdto0_.UserRole as UserRole0_, userdto0_.UserStatus as UserStatus0_ from users.User userdto0_ where username=?
Hibernate: select userperson0_.UserPersonalInfoId as UserPers1_5_0_, userperson0_.UserFirstName as UserFirs2_5_0_, userperson0_.UserLastName as UserLast3_5_0_, userperson0_.UserEmail as UserEmail5_0_, userperson0_.UserContactNumber as UserCont5_5_0_, userperson0_.UserAddress as UserAddr6_5_0_ from users.UserPersonalInfo userperson0_ where userperson0_.UserPersonalInfoId=?
Hibernate: select userdto0_.UserId as UserId0_, userdto0_.UserName as UserName0_, userdto0_.UserSchoolId as UserScho3_0_, userdto0_.UserPassword as UserPass4_0_, userdto0_.UserRole as UserRole0_, userdto0_.UserStatus as UserStatus0_ from users.User userdto0_ where username=?
Hibernate: select userperson0_.UserPersonalInfoId as UserPers1_5_0_, userperson0_.UserFirstName as UserFirs2_5_0_, userperson0_.UserLastName as UserLast3_5_0_, userperson0_.UserEmail as UserEmail5_0_, userperson0_.UserContactNumber as UserCont5_5_0_, userperson0_.UserAddress as UserAddr6_5_0_ from users.UserPersonalInfo userperson0_ where userperson0_.UserPersonalInfoId=?
Hibernate: select userdto0_.UserId as UserId0_, userdto0_.UserName as UserName0_, userdto0_.UserSchoolId as UserScho3_0_, userdto0_.UserPassword as UserPass4_0_, userdto0_.UserRole as UserRole0_, userdto0_.UserStatus as UserStatus0_ from users.User userdto0_ where username=?
Hibernate: insert into users.User (UserName, UserSchoolId, UserPassword, UserRole, UserStatus, UserId) values (?, ?, ?, ?, ?, ?)
Hibernate: insert into users.UserPersonalInfo (UserFirstName, UserLastName, UserEmail, UserContactNumber, UserAddress, UserPersonalInfoId) values (?, ?, ?, ?, ?, ?)
Mar 16, 2012 12:44:30 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [blackboard] in context with path [/Blackboard] threw exception [Request processing failed; nested exception is java.lang.Exception: java.lang.NullPointerException] with root cause
java.lang.NullPointerException
   at org.hibernate.tuple.entity.AbstractEntityTuplizer.getPropertyValue(AbstractEntityTuplizer.java:521)
   at org.hibernate.persister.entity.AbstractEntityPersister.getPropertyValue(AbstractEntityPersister.java:3867)
   at org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:100)
   at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
   at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
   at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
   at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
   at com.peanuts.blackboard.database.dao.impl.StudentDAO.savenewStudent(StudentDAO.java:72)
   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 org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   at

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.Exception: java.lang.NullPointerException
   org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
   org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:722)


root cause

java.lang.Exception: java.lang.NullPointerException
   com.peanuts.blackboard.web.controller.admin.AdminAddUserController.onSubmit(AdminAddUserController.java:89)
   sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   java.lang.reflect.Method.invoke(Method.java:597)
   org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
   org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
   org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
   org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
   org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
   org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
   org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:722)


root cause

java.lang.NullPointerException
   org.hibernate.tuple.entity.AbstractEntityTuplizer.getPropertyValue(AbstractEntityTuplizer.java:521)
   org.hibernate.persister.entity.AbstractEntityPersister.getPropertyValue(AbstractEntityPersister.java:3867)
   org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:100)
   org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
   org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
   org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
   org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
   org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
   org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
   org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
   org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
   org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
   com.peanuts.blackboard.database.dao.impl.StudentDAO.savenewStudent(StudentDAO.java:72)
   sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   java.lang.reflect.Method.invoke(Method.java:597)
   org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

<hibernate-mapping>
     <class name="com.peanuts.blackboard.database.dto.UserDTO" table="users.User">
          <id column="UserId" name="userId" type="java.lang.Integer">
               <generator class="org.hibernate.id.TableHiLoGenerator">
                    <param name="table">Identity</param>
<param name="column">NEXT</param>
               </generator>
          </id>
  <one-to-one name="userPersonalInfoDTO" class="com.peanuts.blackboard.database.dto.UserPersonalInfoDTO" cascade="save-update"/>
<property column="UserName" name="userName" type="java.lang.String"/>
<property column="UserSchoolId" name="userSchoolId" type="java.lang.Integer"/>
<property column="UserPassword" name="userPassword" type="java.lang.String"/>
<property column="UserRole" name="userRole" type="java.lang.String"/>
<property column="UserStatus" name="userStatus" type="java.lang.String"/>
     </class>
</hibernate-mapping>

<hibernate-mapping>
     <class name="com.peanuts.blackboard.database.dto.UserPersonalInfoDTO" table="users.UserPersonalInfo">
          <id column="UserPersonalInfoId" name="userPersonalInfoId" type="java.lang.Integer">
               <generator class="org.hibernate.id.ForeignGenerator">
                    <param name="property">userDTO</param>
      <param name="column">NEXT</param>
               </generator>
          </id>
<one-to-one name="userDTO" class="com.peanuts.blackboard.database.dto.UserDTO" constrained="true"/>         
<property column="UserFirstName" name="userFirstName" type="java.lang.String"/>
<property column="UserLastName" name="userLastName" type="java.lang.String"/>
<property column="UserEmail" name="userEmail" type="java.lang.String"/>
<property column="UserContactNumber" name="userContactNumber" type="java.lang.String"/>
<property column="UserAddress" name="userAddress" type="java.lang.String"/>
     </class>
</hibernate-mapping>

public class UserDTO {
   
   private int userId;
   private String userName;
   private int userSchoolId;
   private String userPassword;
   private String userRole;
   private String userStatus;
   private UserPersonalInfoDTO userPersonalInfoDTO;
   
   public int getUserId() {
      return userId;
   }
   public void setUserId(int userId) {
      this.userId = userId;
   }
   public String getUserName() {
      return userName;
   }
   public void setUserName(String userName) {
      this.userName = userName;
   }
   public int getUserSchoolId() {
      return userSchoolId;
   }
   public void setUserSchoolId(int userSchoolId) {
      this.userSchoolId = userSchoolId;
   }
   public String getUserPassword() {
      return userPassword;
   }
   public void setUserPassword(String userPassword) {
      this.userPassword = userPassword;
   }
   public String getUserRole() {
      return userRole;
   }
   public void setUserRole(String userRole) {
      this.userRole = userRole;
   }
   public String getUserStatus() {
      return userStatus;
   }
   public void setUserStatus(String userStatus) {
      this.userStatus = userStatus;
   }
   public UserPersonalInfoDTO getUserPersonalInfoDTO() {
      return userPersonalInfoDTO;
   }
   public void setUserPersonalInfoDTO(UserPersonalInfoDTO userPersonalInfoDTO) {
      this.userPersonalInfoDTO = userPersonalInfoDTO;
   }

}

public class UserPersonalInfoDTO {
   
   private int userPersonalInfoId;
   private String userFirstName;
   private String userLastName;
   private String userEmail;
   private String userContactNumber;
   private String userAddress;
   private UserDTO userDTO;
   
   
   public int getUserPersonalInfoId() {
      return userPersonalInfoId;
   }
   public void setUserPersonalInfoId(int userPersonalInfoId) {
      this.userPersonalInfoId = userPersonalInfoId;
   }
   public String getUserFirstName() {
      return userFirstName;
   }
   public void setUserFirstName(String userFirstName) {
      this.userFirstName = userFirstName;
   }
   public String getUserLastName() {
      return userLastName;
   }
   public void setUserLastName(String userLastName) {
      this.userLastName = userLastName;
   }
   public String getUserEmail() {
      return userEmail;
   }
   public void setUserEmail(String userEmail) {
      this.userEmail = userEmail;
   }
   public String getUserContactNumber() {
      return userContactNumber;
   }
   public void setUserContactNumber(String userContactNumber) {
      this.userContactNumber = userContactNumber;
   }
   public String getUserAddress() {
      return userAddress;
   }
   public void setUserAddress(String userAddress) {
      this.userAddress = userAddress;
   }

   public UserDTO getUserDTO() {
      return userDTO;
   }
   public void setUserDTO(UserDTO userDTO) {
      this.userDTO = userDTO;
   }
}