java - hibernate 异常: transaction roll back failed

Question

当我在 java swing 中运行我的 hibernate 项目时，它首先可以工作。但是当我等待一段时间后，我收到了类似 org.hibernate.TransactionException: rollback failed.. 的错误。请告诉我一个解决方案。

这是我的错误

Aug 16, 2013 10:52:21 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 0, SQLState: 08S01
Aug 16, 2013 10:52:21 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: Communications link failure
The last packet successfully received from the server was 89,371 milliseconds ago. 
The last packet sent successfully to the server was 1 milliseconds ago.
Exception in thread "AWT-EventQueue-0" org.hibernate.TransactionException: rollback  failed
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.rollback(AbstractTransactionImpl.java:215) at com.softroniics.queenpharma.services.PurchaseOrderService.showAllPurchase(PurchaseOrderService.java:131)

这是我的 hibernate cfg 文件

<?xml version='1.0' encoding='utf-8'?> 
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD  3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://queenpharma.db.11583306.hostedresource.com/queenpharma</property>
    <property name="connection.username">queenpharma</property>
    <property name="connection.password">Queenpharma#1</property>
    <property name="connection.pool_size">1</property>
    <property name="hbm2ddl.auto">update</property>
    <property name="show_sql">true</property>
    <property name="connection.autocommit">false</property>

    <property name="hibernate.c3p0.max_size">1</property>
    <property name="hibernate.c3p0.min_size">0</property>
    <property name="hibernate.c3p0.timeout">5000</property>
    <property name="hibernate.c3p0.max_statements">1000</property>
    <property name="hibernate.c3p0.idle_test_period">300</property>
    <property name="hibernate.c3p0.acquire_increment">1</property>

    <property name="current_session_context_class">thread</property>
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
    <mapping class="com.softroniics.queenpharma.model.LoginModel" />
    <mapping class="com.softroniics.queenpharma.model.PurchaseCompanyModel" />

----等等------

这是我的一些代码

        session = sessionFactory.openSession();
    StockModel stockModel = null;
    try {
        tx = session.beginTransaction();
        Iterator<StockModel> iterator = session
                .createQuery("FROM StockModel where productid='" + id + "'")
                .list().iterator();
        if(iterator.hasNext()){
        stockModel = iterator.next();
        }

    } catch (HibernateException e) {
        if (tx != null)
            tx.rollback();
        e.printStackTrace();
    } finally {
         session.close();

Answer 1

您收到的错误代码 SQLState: 08S01 表明您用于数据库的主机名不正确，根据 Mapping MySQL Error Numbers to JDBC SQLState Codes .

首先请确保数据库主机:queenpharma.db.11583306.hostedresource.com拼写正确。

如果错误仍然存​​在，请修改您的异常处理程序以捕获由回滚语句引起的异常，如下所示，以便您能够首先了解导致回滚的原因。

注意:您应该仅在解决此问题时执行此操作。您不希望在生产环境中浅化任何异常

} catch (HibernateException e) {
    if (tx != null) {
        try {
            tx.rollback();
        } catch(Exception re) {
            System.err.println("Error when trying to rollback transaction:"); // use logging framework here
            re.printStackTrace();
        }
    }
    System.err.println("Original error when executing query:"); // // use logging framework here

    e.printStackTrace();
}