Hibernate null pointer exception - spring

Question

I'm getting a null pointer exception at the following line in my DAO:
Session session = sessionFactory.getCurrentSession();
I'm not entirely sure why as I print to the console the correct values using the session/sessionFactory instances but when I try to output the same values in my jsp I get the null pointer exception.
My xml configuration:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"`
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
<context:annotation-config></context:annotation-config>
<context:component-scan base-package="com.sga.app.dao"></context:component-scan>
<jee:jndi-lookup jndi-name="jdbc/springSgaDb" id="dataSource"
expected-type="javax.sql.DataSource">
</jee:jndi-lookup>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
</props>
</property>
<property name="packagesToScan">
<list>
<value>com.sga.app.beans</value>
<value>com.sga.app.dao</value>
</list>
</property>
<property name="annotatedClasses">
<array>
<value>com.sga.app.dao.DisplayStatsDAO</value>
</array>
</property>
<!-- -->
</bean>
<bean id="exceptionTranslator"
class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor">
</bean>
<tx:annotation-driven />
</beans>
My DAO:
package com.sga.app.dao;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import com.sga.app.beans.UserBean;
#SuppressWarnings("unchecked")
#Component("displayStatsDAO")
#Transactional
#Repository
#Configuration
public class DisplayStatsDAO implements Serializable {
private static final long serialVersionUID = 1L;
#Autowired
private SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
#Bean
public DisplayStatsDAO displayStatsDAO() {
return new DisplayStatsDAO();
}
public DisplayStatsDAO() {
}
public String getLoggedInUserName(String username) {
Authentication authentication = SecurityContextHolder.getContext()
.getAuthentication();
String userLoggedIn = authentication.getName();
return userLoggedIn;
}
#Transactional
public ArrayList<Object> showMyStats() {
#SuppressWarnings("rawtypes")
ArrayList result = new ArrayList();
try {
/*
* SessionFactory factory = (SessionFactory) new
* org.hibernate.cfg.Configuration
* ().configure().buildSessionFactory(); Session sesh =
* factory.openSession(); sesh.beginTransaction();
*/
Session session = sessionFactory.getCurrentSession();
Authentication authentication = SecurityContextHolder.getContext()
.getAuthentication();
String userLoggedIn = authentication.getName();
System.out.println(userLoggedIn);
session.beginTransaction();
Criteria criteria = session.createCriteria(UserBean.class);
criteria.add(Restrictions.like("username", userLoggedIn));
List<UserBean> user = (List<UserBean>) criteria.list();
// session.getTransaction().commit();
for (UserBean userDetails : user) {
System.out.println("SHOW LOGGED-IN USER");
System.out.println("Username: " + userDetails.getUsername());
result.add(userDetails.getUsername());
System.out.println("Name: " + userDetails.getForename() + ""
+ userDetails.getSurname());
result.add(userDetails.getForename());
result.add(userDetails.getSurname());
System.out.println("Homeclub: " + userDetails.getHomeclub());
result.add(userDetails.getHomeclub());
System.out.println("GIR: " + userDetails.getGir());
result.add(userDetails.getGir());
System.out
.println("Fairways: " + userDetails.getFairways_hit());
result.add(userDetails.getFairways_hit());
System.out.println("Putts: " + userDetails.getPutts());
result.add(userDetails.getPutts());
System.out.println("Score average: "
+ userDetails.getScore_avg());
result.add(userDetails.getScore_avg());
System.out
.println("Sand saves: " + userDetails.getSand_saves());
result.add(userDetails.getSand_saves());
System.out.println();
System.out.println(result.get(0).toString());
System.out.println(result.get(3).toString());
return result;
}
} catch (HibernateException e) {
e.printStackTrace();
}
return result;
}
}
My jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%# taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql"%>
<%# taglib prefix="sf" uri="http://www.springframework.org/tags/form"%>
<%# taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<%#page import="com.sga.app.dao.DisplayStatsDAO" %>
<%#page import="java.util.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link href="${pageContext.request.contextPath}/static/css/main.css"
rel="stylesheet" type="text/css">
<title>SGA-user stats</title>
</head>
<body>
<!-- Logout option -->
<div id="logoutOptionDiv" align="right">
<a id="logoutOption" style="color: blue;"
href='<c:url value="/j_spring_security_logout"></c:url>'>Logout</a>
</div>
<br />
<!-- Page nav -->
<div>
<a style="font-weight: bold;"
href="${pageContext.request.contextPath}/menu">Main menu</a> <a
style="font-weight: bold; margin-left: 15px;"
href="${pageContext.request.contextPath}/roundanalysis">Round
analysis</a>
</div>
<br />
<br />
<h2 class="displayStatsLeaderboardHeader">Your stats</h2>
<table class="displayStatsTable" border="1">
<tr>
<td>Username</td>
<td>Forename</td>
<td>Surname</td>
<td>Average Score</td>
<td>GIR (%)</td>
<td>Fairways hit (%)</td>
<td>Sand saves (%)</td>
<td>Putts per round</td>
</tr>
<%DisplayStatsDAO stats = new DisplayStatsDAO();%>
<tr>
<td class="displayStatsTableData"><%stats.showMyStats().get(0).
toString();%>
</td>
<td class="displayStatsTableData">${row.surname}</td>
<td class="displayStatsTableData">${row.average_score}</td>
<td class="displayStatsTableData">${row.gir}</td>
<td class="displayStatsTableData">${row.fairways_hit}</td>
<td class="displayStatsTableData">${row.sand_saves}</td>
<td class="displayStatsTableData">${row.putts}</td>
</tr>
</table>
</body>
</html>

Answer 1

When you write new DisplayStatsDAO() in your jsp, it is initialized outside of the Spring container's context. Spring has no way of injecting Session into the DAO.