Spring JPA/Hibernate in standalone app - spring

Question

I am utilizing spring in non web application and I am using hibernate for working with DB. Problem I am experiencing is that while "registerShutdownHook();" does close spring context container it does not properly shut down and close resources for JPA so my connections to DB are getting maxed out.
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="persistenceUnitName" value="pu" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="generateDdl" value="false" />
<property name="showSql" value="false" />
<property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
</bean>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
I use configuration presented above to fire up JPA layer and use "#Transactional" annotations to inject EM's into DAO's.
Maybe someone could help me out what am I missing or how should I handle proper closing of JPA sessions in standalone environment ?
Thank you,
P.S. Exception I am getting is: java.net.SocketException: No buffer space available (maximum connections reached?): connect

Answer 1

1.Create transaction manager as follow :
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >
<property name="persistenceUnitName" value="persistanceUnit"/>
<property name="dataSource" ref="dataSource"/>
<property name="persistenceXmlLocation" value="classpath:persistence.xml"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="${db.orm.showsql}" />
<property name="generateDdl" value="${db.orm.generateDdl}" />
<property name="database" value="${db.type}"/>
<property name="databasePlatform" value="${db.orm.dialect}" />
</bean>
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">create</prop>
</props>
</property>
</bean>
2.use persistance.xml(should be in classpath)
<?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="persistanceUnit" transaction-type="RESOURCE_LOCAL">
<description>Oracle db Persistence Unit</description>
<class>com.company.YourModelClass</class>
<properties/>
</persistence-unit>
</persistence>
3.Add following annotation in applicationContext.xml
<context:component-scan base-package="com.yourcompany.basepackage" />
4.annoatate your Entitymanager in service class like:
#PersistenceContext
private EntityManager em = null;
5.Inject TrasnsactionManager to :
private PlatformTransactionManager platformTransactionManager = null;
6.persist object like:
platformTransactionManager .persist(obj);

Answer 2

This is another example of application Context.xml with JPA. It works fine for me.
<context:property-placeholder location=”classpath:jdbc.properties”/>
<!– Connection Pool –>
<bean id=”dataSource” destroy-method=”close”>
<property name=”driverClass” value=”${jdbc.driverClass}”/>
<property name=”jdbcUrl” value=”${jdbc.url}”/>
<property name=”user” value=”${jdbc.username}”/>
<property name=”password” value=”${jdbc.password}”/>
</bean>
<!– JPA EntityManagerFactory –>
<bean id=”entityManagerFactory”
p:dataSource-ref=”dataSource”>
<property name=”jpaVendorAdapter”>
<bean>
<property name=”database” value=”${jdbc.database}”/>
<property name=”showSql” value=”${jdbc.showSql}”/>
</bean>
</property>
</bean>
<!– Transaction manager for a single JPA EntityManagerFactory (alternative to JTA) –>
<bean id=”transactionManager”
p:entityManagerFactory-ref=”entityManagerFactory”/>
<!– Activates various annotations to be detected in bean classes for eg #Autowired–>
<context:annotation-config/>
<!– enable the configuration of transactional behavior based on annotations –>
<tx:annotation-driven transaction-manager=”transactionManager”/>
<!– Property Configurator –>
<bean id=”propertyConfigurer”>
<property name=”location” value=”jdbc.properties”/>
</bean>
<context:component-scan base-package=”com.test.dao”/>
</beans>