所有在池中使用的连接是困&创建新连接 [英] All used connections in pool are sleepy & new connections are created

问题描述

我们正在使用 c3p0 和 Hibernate 。但是hibernate不会重用池中的连接。当我看到 mysql-workbench 的客户端连接，我可以看到他们大部分都在睡眠状态。

We are using c3p0 pooling along with Hibernate. But hibernate is not re-using the connections in the pool. When I see mysql-workbench for client connections, I can see most of them are in "Sleep" state. The pool keeps growing over time, by my specified increment, until I eventually run out.

以下是数据配置中的代码片段：

Here's the snippet from the data configuration:

persistenceMap.put(
    "connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider"
);
persistenceMap.put("hibernate.c3p0.min_size", "1");
persistenceMap.put("hibernate.c3p0.max_size", "5");
persistenceMap.put("hibernate.c3p0.timeout", "5");
persistenceMap.put("hibernate.c3p0.max_statements", "20");
persistenceMap.put("hibernate.c3p0.acquire_increment", "1");
persistenceMap.put("hibernate.c3p0.maxIdleTimeExcessConnections", "3");

MYSQL - Workbench - >客户端连接：

MYSQL - Workbench --> Client Connections:

请帮助/建议。

推荐答案

以下解决方案似乎为我工作

Following solution appears to be working for me

连接池Jars已更新。

Connection Pooling Jars has been updated.

• c3p0-0.9.2.1


• hibernate-c3p0-5.1.0.Final


• mchange-commons-java-0.2.3.4

AND

持久性属性已更改如下。
持久性属性

Persistence properties has been changed as below. Persistence Properties

persistenceMap.put("javax.persistence.jdbc.url","jdbc:mysql://localhost:3306/test_db");
persistenceMap.put("javax.persistence.jdbc.user", "root");
persistenceMap.put("javax.persistence.jdbc.password", "root");
persistenceMap.put("javax.persistence.jdbc.driver", "com.mysql.jdbc.Driver");
persistenceMap.put("hibernate.show_sql", "true");
persistenceMap.put("hibernate.format_sql", "true");
persistenceMap.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
persistenceMap.put("hibernate.hbm2ddl.auto", "validate");

persistenceMap.put("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider");
persistenceMap.put("hibernate.c3p0.min_size", "1");
persistenceMap.put("hibernate.c3p0.max_size", "20");
persistenceMap.put("hibernate.c3p0.timeout", "10");
persistenceMap.put("hibernate.c3p0.max_statements", "50");

FYi ...
我使用
操作系统：Ubuntu
Java版本：8
Hibernate版本：5.1.0

FYi ... I am using OS: Ubuntu Java Version: 8 Hibernate Version: 5.1.0

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