Problema com Spring

segue o erro:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘produtoDao’ defined in file [C:\Users\andre\Desktop\apache-tomcat-7.0.14\wtpwebapps\Upload\WEB-INF\classes\br\com\upload\persistencia\ProdutoDao.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [br.com.upload.persistencia.ProdutoDao]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1009)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:955)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)

at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:605)

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:926)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:477)

at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:383)

at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)

at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)

at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)

at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)

at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)

at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)

at java.util.concurrent.FutureTask.run(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [br.com.upload.persistencia.ProdutoDao]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError

at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:162)

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:76)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1002)

… 21 more

a classe ProdutoDao:

@Repository
public class ProdutoDao {

…}

Spring.xml----->

<?xml version="1.0" encoding="UTF-8"?>

<!-- Activates scanning of @Autowired -->
<context:annotation-config />
<!-- Scans for @Repository, @Service and @Component -->
<context:component-scan base-package="br.com.upload" />
<!-- Enable @Transactional support -->
<tx:annotation-driven />

@Repository
	public class ProdutoDao {
		private  Session session;
		
		public ProdutoDao() {
			this.session=HibernateUtil.getSession();
		}
		
	public void salvar(Produto produto){
	Transaction tx = session.beginTransaction();
	session.save(produto);
	tx.commit();

.....

A classe HibernateUtil

public class HibernateUtil {
  
private static SessionFactory sessionFactory;
	
	private static final ThreadLocal sessionThread;

	static {
		sessionThread = new ThreadLocal();
		sessionFactory = new Configuration().configure().buildSessionFactory();
	}
	
	public static Session getSession() {
		Session session = (Session)sessionThread.get();
		
		if (session == null) {
			session = sessionFactory.openSession(); 
			sessionThread.set(session);
		}
		return session;
	}
	
	public static void closeSession() {
		Session session = (Session)sessionThread.get();
		sessionThread.set(null);
		
		if (session != null && session.isOpen()) {
			session.flush();
			session.close();
		}
	}
}

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