<hibernate-mapping package="com.peanuts.blackboard.database.dto">
     <class name="com.peanuts.blackboard.database.dto.UserPersonalInfoDTO" table="users.UserPersonalInfo">
          <id name="userId" type="java.lang.Integer" column="UserId" unsaved-value="any">
                <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" ></one-to-one>          
<property column="UserFirstName" name="userFirstName" type="java.lang.String" not-null="true"/>
<property column="UserLastName" name="userLastName" type="java.lang.String" not-null="true"/>
<property column="UserEmail" name="userEmail" type="java.lang.String" not-null="true"/>
<property column="UserContactNumber" name="userContactNumber" type="java.lang.String" not-null="true"/>
<property column="UserAddress" name="userAddress" type="java.lang.String" not-null="true"/>
<!-- <property column="CREATION_DATE" length="4" name="creationDate" type="java.util.Date"/>
<property column="CREATED_BY" name="createdBy" type="java.lang.Double"/>
<property column="MODIFICATION_DATE" length="4" name="modificationDate" type="java.util.Date"/>
<property column="MODIFIED_BY" name="modifiedBy" type="java.lang.Double"/>
<property column="DELETE_DATE" length="4" name="deleteDate" type="java.util.Date"/>
<property column="DELETED_BY" name="deletedBy" type="java.lang.Double"/> -->
     </class>
</hibernate-mapping>

<hibernate-mapping package="com.peanuts.blackboard.database.dto">
     <class name="com.peanuts.blackboard.database.dto.UserDTO" table="users.User">
          <id name="userId"  type="java.lang.Integer" column="UserId" unsaved-value="any">
         <generator class="native">
             <!--       <param name="property">userPersonalInfoDTO</param>
<param name="column">NEXT</param> -->
               </generator>       
          </id>
  <one-to-one name="userPersonalInfoDTO" class="com.peanuts.blackboard.database.dto.UserPersonalInfoDTO"  cascade="all" ></one-to-one>
<property column="UserName" name="userName" type="java.lang.String" not-null="true"/>
<property column="UserSchoolId" name="userSchoolId" type="java.lang.Integer" not-null="true"/>
<property column="UserPassword" name="userPassword" type="java.lang.String"/>
<property column="UserRole" name="userRole" type="java.lang.String" not-null="true"/>
<property column="UserStatus" name="userStatus" type="java.lang.String" not-null="true"/>
<!-- <property column="CREATION_DATE" length="4" name="creationDate" type="java.util.Date"/>
<property column="CREATED_BY" name="createdBy" type="java.lang.Double"/>
<property column="MODIFICATION_DATE" length="4" name="modificationDate" type="java.util.Date"/>
<property column="MODIFIED_BY" name="modifiedBy" type="java.lang.Double"/>
<property column="DELETE_DATE" length="4" name="deleteDate" type="java.util.Date"/>
<property column="DELETED_BY" name="deletedBy" type="java.lang.Double"/> -->
     </class>
</hibernate-mapping>

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:74)
   at com.peanuts.blackboard.database.dao.impl.StudentDAO$$FastClassByCGLIB$$28a91834.invoke(<generated>)
   at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
   at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
   at com.peanuts.blackboard.database.dao.impl.StudentDAO$$EnhancerByCGLIB$$946d8675.savenewStudent(<generated>)
   at com.peanuts.blackboard.bus.svc.impl.StudentManager.savenewStudent(StudentManager.java:36)
   at com.peanuts.blackboard.web.controller.admin.AdminAddUserController.onSubmit(AdminAddUserController.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.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
   at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
   at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
   at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
   at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
   at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.invoke(HttpRequestOperationCollectionValve.java:84)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
   at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:662)