无法释放JDBC连接

Question

我是新来JPA &休眠，我正在执行重置密码操作。在这种情况下，实体对象（用户）得到更新后，我试图登录，但不幸的是，服务器被挂起，我得到了下面的异常。

javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Unable to release JDBC Connection 

下面是我们的持久性文件，配置

<properties> 

    <!-- Configuring JDBC properties --> 
    <property name="javax.persistence.jdbc.url" value="jdbc:mysql://127.0.0.1:3306/dbname?autoReconnect=true&amp;useUnicode=true" /> 
    <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver" /> 
    <property name="javax.persistence.jdbc.user" value="username" /> 
    <property name="javax.persistence.jdbc.password" value="password" /> 
    <property name="hibernate.jdbc.batch_size" value="80000" /> 
    <property name="hibernate.show_sql" value="false" /> 
    <property name="hibernate.format_sql" value="false" /> 
    <property name="hibernate.use_sql_comments" value="false" /> 
    <property name="hibernate.hbm2ddl.auto" value="none" /> 
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" /> 
    <property name="hibernate.connection.charSet" value="UTF-8" /> 
    <property name="hibernate.max_fetch_depth" value="2" /> 

    <!-- Configuring Connection Pool --> 
    <property name="hibernate.c3p0.min_size" value="10" />  
    <property name="hibernate.c3p0.max_size" value="250" /> 
    <property name="hibernate.c3p0.acquire_increment" value="10"/> 
    <property name="hibernate.c3p0.timeout" value="500" /> 
    <property name="hibernate.c3p0.max_statements" value="50" /> 
    <property name="hibernate.c3p0.idle_test_period" value="2000" /> 

    <!-- Newly added --> 
    <property name="hibernate.c3p0.maxConnectionAge" value="300"/> 
    <property name="hibernate.c3p0.maxIdleTimeExcessConnections" value="300"/> 
    <property name="hibernate.c3p0.testConnectionOnCheckin" value="true"/> 
    <property name="hibernate.c3p0.preferredTestQuery" value="select 1"/> 
    <property name="hibernate.c3p0.validate" value="false"/> 
    <property name="hibernate.c3p0.testConnectionOnCheckout" value="false" /> 
</properties> 

谁能帮助我我做了什么错？我在配置文件中遗漏的任何东西？

Answer 1

这是我的设置和完美的作品与Hibernate 5.2.4和Spring MVC 4.3.4和Maven 3.3.9

<!-- Set Up data base DataSource and the connection pool --> 
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" 
     destroy-method="close"> 
    <property name="driverClass" value="com.mysql.jdbc.Driver" /> 
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mySchemaName?useSSL=false" /> 
    <property name="user" value="root" /> 
    <property name="password" value="**********" /> 

    <!-- the connection pool properties for C3P0 --> 
    <property name="minPoolSize" value="5" /> 
    <property name="maxPoolSize" value="20" /> 
    <property name="maxIdleTime" value="30000" /> 
</bean> 

<!-- Setu session factory for Hibernate --> 
<bean id="sessionFactory" 
    class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> 
    <property name="dataSource" ref="dataSource" /> 
    <property name="packagesToScan" value="com.package.whatever" /> 
    <property name="hibernateProperties"> 
     <props> 
      <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
      <prop key="hibernate.show_sql">true</prop> 
     </props> 
    </property> 

<!-- Setup Hibernate transaction manager --> 
<bean id="myTransactionManager" 
     class="org.springframework.orm.hibernate5.HibernateTransactionManager"> 
    <property name="sessionFactory" ref="sessionFactory"/> 
</bean> 

提示：如果您正在使用glassfish服务器4.1.1你必须找到glasfish/domains/domain1/modules，并用最新的jboss-logger替换jboss-logger 3.3.0