Hibernate:关闭会话工厂不会关闭c3p0连接池
我最近开始在应用程序中使用hibernate和c3p0作为ORM。但是,当我关闭会话工厂时,连接池不会自行关闭!这是我的应用程序中 唯一
可以进行会话操作的地方。
StatelessSession session = null; Transaction transaction = null;
try {
session = sessionFactory.openStatelessSession();
transaction = session.beginTransaction();
List<Thingy> list = session.getNamedQuery("getAvailableThingy").list();
transaction.commit();
return list;
} catch (Exception error) {
if (transaction != null) {
transaction.rollback();
}
throw error;
} finally {
if (session != null) {
session.close();
}
}
这是我的hibernate.cfg.xml
配置文件
<?xml version='1.0' encoding='utf-8'?><!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="javax.persistence.validation.mode">none</property>
<property name="hibernate.connection.release_mode">after_transaction</property>
<property name="hibernate.c3p0.minPoolSize">1</property>
<property name="hibernate.c3p0.maxPoolSize">2</property>
<property name="hibernate.c3p0.acquireIncrement">1</property>
<property name="hibernate.c3p0.initialPoolSize">1</property>
<property name="hibernate.c3p0.timeout">30</property>
<property name="hibernate.c3p0.maxIdleTimeExcessConnections">5</property>
<property name="hibernate.c3p0.idleConnectionTestPeriod">300</property>
</session-factory>
</hibernate-configuration>
请注意,空闲连接非常短的原因是它是我尚未通过集成测试的唯一方法。他们经常打开和关闭会话工厂,因此我总是用尽所有连接。正如我们在项目开始时一样,从长远来看,我认为这不是一个非常可持续的策略。
需要注意的“有趣”是,尽管我将初始连接池设置为一个,但c3p0仍然尝试在启动时打开两个连接。我的猜测是某个隐藏的会话在某个地方不会关闭(但是在哪里?击败了我)。
那么,如何才能使那个烦人的连接池关闭呢?
附加信息:我如何创建和销毁会话工厂
import static com.google.common.base.Preconditions.*;import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.inject.Provides;
@Singleton
public class PostgisConnection implements Provider<SessionFactory>, AutoCloseable {
private final Logger logger = LoggerFactory.getLogger(getClass());
private final ConnectionInfo connectionInfo;
private SessionFactory sessionFactory = null;
@Inject
public PostgisConnection(ConnectionInfo connectionInfo) {
this.connectionInfo = connectionInfo;
}
public AutoCloseable open() {
checkState(sessionFactory == null, "Connections to postgis are already open");
logger.info("Creating sessionFactory for connection to postgis: {}", connectionInfo.getJdbcUrl());
sessionFactory = newPostgisSessionFactory(connectionInfo);
return this;
}
@Override
public void close() throws Exception {
try {
if (sessionFactory != null) {
logger.info("Closing sessionFactory for postgis: {}", connectionInfo.getJdbcUrl());
sessionFactory.close();
checkState(sessionFactory.isClosed(), "Session factory should be closed at this point");
}
} catch (Exception error) {
logger.error("Error closing SessionFactory", error);
}
}
@Provides
public SessionFactory get() {
return sessionFactory;
}
public static SessionFactory newPostgisSessionFactory(ConnectionInfo connectionInfo) {
Configuration configuration = configurationWith(connectionInfo);
return configuration.buildSessionFactory(registryFrom(configuration));
}
private static Configuration configurationWith(ConnectionInfo connectionInfo) {
Configuration configuration = new Configuration();
setConnectionInfo(connectionInfo, configuration);
configuration.addURL(PostgisConnection.class.getResource("mapping.hbm.xml"));
configuration.configure(PostgisConnection.class.getResource("hibernate.cfg.xml"));
return configuration;
}
private static void setConnectionInfo(ConnectionInfo connectionInfo, Configuration configuration) {
configuration.setProperty("hibernate.connection.url", connectionInfo.getJdbcUrl());
configuration.setProperty("hibernate.connection.username", connectionInfo.getUsername());
configuration.setProperty("hibernate.connection.password", connectionInfo.getPassword());
}
private static ServiceRegistry registryFrom(Configuration configuration) {
return new ServiceRegistryBuilder()
.applySettings(configuration.getProperties())
.buildServiceRegistry();
}
}
- Hibernate版本:4.1.10.Final
- C3p0版本:0.9.1.2
回答:
我遇到了同样的问题,并成功使用了此错误报告中提供的解决方法:
private void closeSessionFactory(SessionFactory factory) { if(factory instanceof SessionFactoryImpl) {
SessionFactoryImpl sf = (SessionFactoryImpl)factory;
ConnectionProvider conn = sf.getConnectionProvider();
if(conn instanceof C3P0ConnectionProvider) {
((C3P0ConnectionProvider)conn).close();
}
}
factory.close();
}
您必须引用hibernate-c3p0-4.xx jar。
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