Hibernate,C3P0,Mysql - 破管

Question

MySQL的连接似乎有8小时的时间.我在Tomcat中使用Hibernate for ORM运行多个WAR.8个小时后(即过夜),当我拿起空闲连接时,管道就会断裂.

我已经通过代码进行了跟踪,并确保我提交或回滚所有事务.

这是我的hibernate.cfg.xml

<?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.bytecode.use_reflection_optimizer">false</property>
    <property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
    <property name="hibernate.connection.password"></property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost/test</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
    <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
    <property name="hibernate.current_session_context_class">thread</property>
    <!--property name="hibernate.show_sql">true</property>
    <property name="hibernate.format_sql">true</property-->

    <property name="c3p0.min_size">3</property>
    <property name="c3p0.max_size">5</property>
    <property name="c3p0.timeout">1800</property>
    <property name="c3p0.preferredTestQuery">SELECT 1</property>
    <property name="c3p0.testConnectionOnCheckout">true</property>
    <property name="c3p0.idle_test_period">100</property> <!-- seconds -->

    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
    <property name="cache.use_query_cache">false</property>
    <property name="cache.use_minimal_puts">false</property>
    <property name="max_fetch_depth">10</property>

    <property name="hibernate.hbm2ddl.auto">update</property>

    <!-- classes removed -->

</session-factory>

我认为固定它的参数是c3p0.idle_test_period- 它默认为0.但是,我们仍然在运行8小时后出现Broken Pipe问题.虽然谷歌有多个帖子索引,但没有一个得到满意的答案.

Answer 1

因此,原来我是缺少启用C3P0的关键线(C3P0参数我被调整,因为Hibernate使用它内置的连接池都没有效果-它适当的警告是不适合用于生产).在hibernate 2.x中,设置hibernate.c3p0.max_size属性启用了c3p0连接池.但是,在3.x中,您必须指定以下属性 -

<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>

另外,这是我的最终配置参数 -

<property name="hibernate.c3p0.min_size">3</property>
<property name="hibernate.c3p0.max_size">5</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.idle_test_period">100</property> <!-- seconds -->

令人遗憾的是,Hibernate和c3p0在这方面都有糟糕的文档.