Spring, Hibernate & JPA: Calling persist on entitymanager does not seem to commit to database

I'm trying to setup Spring using Hibernate and JPA, but when trying to persist an object, nothing seems to be added to the database.

Am using the following:

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="url" value="${jdbc.url}"/>
    <property name="driverClassName" value="${jdbc.driverClassName}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
</bean>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="persistenceUnitName" value="BankingWeb" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="generateDdl" value="true" />
            <property name="showSql" value="true" />
            <property name="databasePlatform" value="${hibernate.dialect}" />
        </bean>
    </property>
</bean>

<tx:annotation-driven/>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>

<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />

<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

<bean name="accountManager" class="ssel.banking.dao.jpa.AccountManager" />
<bean name="userManager" class="ssel.banking.dao.jpa.UserManager" />

And in AccountManager, I'm doing:

@Repository
public class AccountManager implements IAccountManager {

    @PersistenceContext private EntityManager em;

    /* -- 8< -- Query methods omitted -- 8< -- */

    p