We are implementing a Web App using JPA2.0 and Hibernate3.0. Connection pool configurations are set in persistence.xml located in META-INF folder.
persistence.xml:
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
<persistence-unit name="MyPU" transaction-type="RESOURCE_LOCAL">
<!-- Entity Classes-->
<properties>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
<property name="hibernate.show_sql" value="true"/>
<property name="bytecode.provider" value="org.hibernate.bytecode.javassist.BytecodeProviderImpl"/>
<property name="hibernate.connection.username" value="{username}"/>
<property name="hibernate.connection.password" value="{password}"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hibernate.connection.url" value="{jdbc url}"/>
<property name="hibernate.c3p0.min_size" value="1"/>
<property name="hibernate.c3p0.timeout" value="1000"/>
<property name="hibernate.c3p0.acquire_increment" value="1"/>
<property name="hibernate.c3p0.idle_test_periods" value="600"/>
<property name="hibernate.c3p0.testConnectionOnCheckin" value="true"/>
<property name="hibernate.c3p0.preferredTestQuery" value="SELECT 1;"/>
</properties>
</persistence-unit>
</persistence>
We have a problem with connection pool configurations. It seems the configurations have no effect and the connection will be broken after 8 hours. Do we need another configuration file like hibernate.cfg.xml or hibernate.properties?
I had this same problem with the proprieties that I put in persistence.xml didn't affect c3p0.
Looking into http://www.mchange.com/projects/c3p0/index.html#configuration_files I tried to put an xml file named c3p0-config.xml
and put it in WEB-INF/classes
and it work perfectly.
Here is an example of a c3p0-config.xml
file:
<c3p0-config>
<default-config>
<property name="automaticTestTable">con_test</property>
<property name="checkoutTimeout">30000</property>
<property name="idleConnectionTestPeriod">30</property>
<property name="initialPoolSize">10</property>
<property name="maxIdleTime">30</property>
<property name="maxPoolSize">100</property>
<property name="minPoolSize">10</property>
<property name="maxStatements">200</property>
<user-overrides user="test-user">
<property name="maxPoolSize">10</property>
<property name="minPoolSize">1</property>
<property name="maxStatements">0</property>
</user-overrides>
</default-config>
</c3p0-config>