How to configure Hibernate C3P0 pool - mysql

Question

I had an issue with hibernate connection pool causing the disconnection of the mysql session.
So i make some googling and i used the C3P0 technology as i found to fix this problem but the bug still persist: the connection is lost after 8hours:
Here's my hibernate configuration file:
<property name="hibernate.bytecode.use_reflection_optimizer">false</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.max_statement">100</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.idle_test_period">300</property>
<property name="hibernate.c3p0.acquire_increment">2</property>
<property name="hibernate.c3p0.preferredTestQuery">SELECT 1;</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<property name="hibernate.c3p0.validate">true</property>
<property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/cabinet?characterEncoding=UTF-8</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.current_session_context_class">thread</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.search.autoregister_listeners">false</property>
<property name="hibernate.show_sql">true</property>
And here's my POM file:
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cabinet</groupId>
<artifactId>cabinet</artifactId>
<version>0.0.1</version>
<description></description>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.9</version>
</dependency>
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.12.1.GA</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.5.0-Final</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.9</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>2.3.16.3</version>
</dependency>
<dependency>
<groupId>opensymphony</groupId>
<artifactId>sitemesh</artifactId>
<version>2.4.2</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-sitemesh-plugin</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-json-plugin</artifactId>
<version>2.1.8</version>
</dependency>
<dependency>
<groupId>com.jgeppert.struts2.jquery</groupId>
<artifactId>struts2-jquery-plugin</artifactId>
<version>3.7.1</version>
</dependency>
<dependency>
<groupId>com.jgeppert.struts2.bootstrap</groupId>
<artifactId>struts2-bootstrap-plugin</artifactId>
<version>2.0.0</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>4.3.4.Final</version>
</dependency>
Is there any configuration property to correct or a dependacy to add?

Answer 1

It looks like your c3p0 configuration is ignored. I think you have two different hibernate-core versions, one from hibernate-annotations 3.5.0-Final and one from hibernate-c3p0.4.3.4-Final. Remove the hibernate-annotations 3.5.0-Final dependency because annotations are already included in hibernate-core since v3.5 Your hibernate-c3p0 4.3.4.Final dependency will add hibernate-core 4.3.4.Final.