Configuring c3p0 connection pool for Liferay on Tomcat

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There’s several ways you could configure a connection pool for Liferay on Tomcat but the way I’m going to show is the JEE way and the only one I consider correct.

The first thing is to copy or move the c3p0.jar from webapps/ROOT/WEB-INF/lib/ to lib/. Also make sure you have your dabase driver there. In this example it would be mysql.jar.

Then we need to tell Liferay that you want to use a connection pool from JNDI and this you can do by adding following line to your portal-ext.properties which can be placed in Liferay Home directory (the directory above tomcat).

jdbc.default.jndi.name=jdbc/LiferayPool

Add following snippet to conf/server.xml inside GlobalNamingResources. Adjust the pool size and idle time and connection test period according to your environment. They are particularly important when you have a firewall between your Liferay and database or when the database server drops connections after certain idle period.

<Resource
    name="jdbc/LiferayPool"
    auth="Container"
    type="com.mchange.v2.c3p0.ComboPooledDataSource"
    factory="org.apache.naming.factory.BeanFactory"
    driverClass="com.mysql.jdbc.Driver"
    jdbcUrl="jdbc:mysql://localhost/lportaluseUnicode=true&amp;characterEncoding=UTF-8&amp;useFastDateParsing=false"
    user="lportal"
    password="test"
    minPoolSize="10"
    maxPoolSize="20"
    maxIdleTime="600"
    preferredTestQuery="select 1 from dual"
    idleConnectionTestPeriod="180"
    numHelperThreads="5"
    maxStatementsPerConnection="100"
/>

Now we need to link the jdbc/LiferayPool name defined in portal-ext.properties to the jdbc/LiferayPool defined in server.xml and this definition goes to conf/Catalina/localhost/ROOT.xml

<ResourceLink name="jdbc/LiferayPool" global="jdbc/LiferayPool" type="javax.sql.DataSource"/>

Now we are done and you can start your tomcat with the new connection pool. Note you can follow similar process to configure MailSession from JNDI.

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