Spring + JPA in standalone application doesn't save data in database - spring

Question

I am using
Spring 3.1.1
JPA 2
H2
Hibernate
in standalone Java application. When I run the application, the transaction is executed and when I query the data, the data is retrieved. But the data is not saved when the application is closed.
Please help me.
Here is spring 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:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="persistenceXmlLocation" value="classpath*:META-INF/persistence.xml" />
</bean>
<bean id="sharedEntityManager"
class="org.springframework.orm.jpa.support.SharedEntityManagerBean">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven />
</beans>
Persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
version="1.0">
<persistence-unit name="sling">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.sling.data.Trend</class>
<class>com.sling.data.Gc</class>
<properties>
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.connection.driver_class" value="org.h2.Driver" />
<property name="hibernate.connection.url" value="jdbc:h2:sling;DB_CLOSE_DELAY=-1" />
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />
</properties>
</persistence-unit>
</persistence>
DAO class,
#Repository
public class GcDao {
#PersistenceContext
private EntityManager em;
public GcDao() {
}
#Transactional
public void add(Gc gc){
em.persist(gc);
}
#SuppressWarnings("unchecked")
#Transactional(readOnly = true)
public List<Gc> getGc(){
String queryText = " from Gc";
Query query = em.createQuery(queryText);
return query.getResultList();
}
}

Answer 1

I believe you still need to add context:component-scan on your dao package before your tx:anotation-driven element.
<context:component-scan base-package="com.sling.dao" />
<tx:annotation-driven />