I'm trying to use JPA with hibernate entity manager in my application, but every time I invoke any method on an entity manager bean, I get a nullpointerexception.

Here's my applicationContext.xml:

Code:
<?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:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="
	    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
   		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">


	
	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://localhost:3306/bugs" />
		<property name="username" value="bugs" />
		<property name="password" value="bugs/>
	</bean>
	<bean id="emf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="persistenceUnitName" value="bugsUnit" />
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
				<property name="showSql" value="true" />
				<property name="generateDdl" value="true" />
				<property name="database" value="MYSQL" />
			</bean>
		</property>
	</bean>
	<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="entityManagerFactory" ref="emf" />
	</bean>
	
	<bean id="entityController" class="org.bugs.controller.EntityController" scope="session"/>
	<bean id="user" class="org.bugs.session.User" scope="session">
		<property name="controller" ref="entityController"/>
	</bean>
<tx:annotation-driven />
	
</beans>
persistence.xml:

Code:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
	<persistence-unit name="bugsUnit" transaction-type="RESOURCE_LOCAL">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
	</persistence-unit>
</persistence>
EntityController.java:
Code:
package org.bugs.controller;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.transaction.annotation.Transactional;


public class EntityController {


	@PersistenceContext
    private EntityManager em;
	
	@SuppressWarnings("unchecked")
	@Transactional
	public <T> List<T> getList(Class<T> clase){
		return em.createQuery("select p from "+clase.getSimpleName()+" p").getResultList();
	}
	@Transactional
	public void save(Object objeto){
		em.persist(objeto);
	}
	@Transactional
	public void delete(Object objeto){
		em.remove(objeto);
	}

	
}
User.java:
Code:
package org.bugs.session;

import java.util.Date;

...

public class User {

	private EntityController controller;
	
       ...
	public void setController(EntityController controller) {
		this.controller= controller;
	}
	public EntityController getController() {
		return controller;
	}
	public void saveEntity() {
		MyEntity entity = new MyEntity();
		...
		controller.save(entity);
	}
        ...
}
Anytime I invoke the saveEntity method, I get a NullPointerException in the controller.save(entity) line.

I'm new to Spring and JPA so I must have made a mistake somewhere.

Anybody can help me?