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java - hibernate 未知服务异常 :Unknown service requested as transaction completed

转载 作者:搜寻专家 更新时间:2023-10-30 19:53:44 25 4
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我有一个简单的类,它启动 3 个线程并在每个线程中保存一个新对象。但是我遇到了我无法理解的异常。谁能帮我理解为什么会出现异常?

package test;

import java.util.Date;

import org.hibernate.Session;

import domain.Event;

import util.HibernateUtil;

public class EventBeanTest {

public static void main(String [] args) {

Event e1 = new Event();
e1.setTitle("111");
e1.setDate(new Date());

Event e2 = new Event();
e2.setTitle("222");
e2.setDate(new Date());

Event e3 = new Event();
e3.setTitle("333");
e3.setDate(new Date());


Thread t1 = new Thread(new EventRunnable(e1));
Thread t2 = new Thread(new EventRunnable(e2));
Thread t3 = new Thread(new EventRunnable(e3));

t1.setName("event - 111");
t2.setName("event - 222");
t3.setName("event - 333");

t1.start();
t2.start();
t3.start();

}

}

class EventRunnable implements Runnable {
private Event event;

public EventRunnable(Event event) {
this.event = event;
}

public void run() {

System.out.println("Starting thread : " + Thread.currentThread().getName());

Session session = HibernateUtil.getSessionFactory().getCurrentSession();

session.beginTransaction();

session.saveOrUpdate(event);
session.getTransaction().commit();

HibernateUtil.getSessionFactory().close();

System.out.println("Finishing thread : " + Thread.currentThread().getName());

}
}

这是显示异常的日志文件的相关部分:

Hibernate: select max(EVENT_ID) from test.EVENTS
Hibernate: insert into test.EVENTS (EVENT_DATE, TITLE, EVENT_ID) values (?, ?, ?)
Hibernate: insert into test.EVENTS (EVENT_DATE, TITLE, EVENT_ID) values (?, ?, ?)
Hibernate: insert into test.EVENTS (EVENT_DATE, TITLE, EVENT_ID) values (?, ?, ?)
Apr 22, 2012 2:46:55 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/test]
Finishing thread : event - 333
Apr 22, 2012 2:46:55 PM org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction afterAfterCompletion
INFO: HHH000425: Could not close session; swallowing exception[org.hibernate.service.UnknownServiceException: Unknown service requested [org.hibernate.stat.spi.StatisticsImplementor]] as transaction completed
Exception in thread "event - 222" org.hibernate.service.UnknownServiceException: Unknown service requested [org.hibernate.stat.spi.StatisticsImplementor]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:126)
at org.hibernate.internal.SessionFactoryImpl.getStatisticsImplementor(SessionFactoryImpl.java:1708)
at org.hibernate.internal.SessionFactoryImpl.getStatistics(SessionFactoryImpl.java:1704)
at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.afterTransaction(TransactionCoordinatorImpl.java:140)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.afterTransactionCompletion(JdbcTransaction.java:138)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:184)
at test.EventRunnable.run(EventBeanTest.java:60)
at java.lang.Thread.run(Thread.java:722)
Apr 22, 2012 2:46:55 PM org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction afterAfterCompletion
INFO: HHH000425: Could not close session; swallowing exception[org.hibernate.service.UnknownServiceException: Unknown service requested [org.hibernate.stat.spi.StatisticsImplementor]] as transaction completed
Exception in thread "event - 111" org.hibernate.service.UnknownServiceException: Unknown service requested [org.hibernate.stat.spi.StatisticsImplementor]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:126)
at org.hibernate.internal.SessionFactoryImpl.getStatisticsImplementor(SessionFactoryImpl.java:1708)
at org.hibernate.internal.SessionFactoryImpl.getStatistics(SessionFactoryImpl.java:1704)
at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.afterTransaction(TransactionCoordinatorImpl.java:140)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.afterTransactionCompletion(JdbcTransaction.java:138)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:184)
at test.EventRunnable.run(EventBeanTest.java:60)
at java.lang.Thread.run(Thread.java:722)

编辑 1

<?xml version='1.0' encoding='utf-8'?>

<session-factory>

<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="connection.username">vishnu</property>
<property name="connection.password">con02305</property>

<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>

<!-- SQL dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>

<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>

<!-- Drop and re-create the database schema on startup
<property name="hbm2ddl.auto">update</property> -->

<property name="default_schema">test</property>
<property name="show_sql">true</property>

<mapping resource="domain/Event.hbm.xml"/>

</session-factory>

最佳答案

Hibernate 中的 Session 对象不是线程安全的,你不应该在不同的线程中使用同一个 session ,除非你同步访问 Session 对象。

关于java - hibernate 未知服务异常 :Unknown service requested as transaction completed,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10266750/

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