database-partitioning/src/META-INF/persistence.xml

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
        version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
    <persistence-unit name="order" transaction-type="RESOURCE_LOCAL">
        <class>model.Order</class>
        <class>model.OrderLine</class>
        <class>model.Customer</class>
        <properties>
            <!-- Default database login using MySQL for EclipseLink's internal connection pool,
                 change this to access your own database. -->
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://node1:3306/mysql" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="password" />

            <!-- The database platform is auto-detected by default,
                 if you want to set a specific platform this can be set. -->
            <!-- property name=""eclipselink.target-database" value="Oracle" / -->

            <!-- Configure connection pool. -->
            <property name="eclipselink.connection-pool.default.initial" value="1" />
            <property name="eclipselink.connection-pool.default.min" value="64" />
            <property name="eclipselink.connection-pool.default.max" value="64" />
            
            <!-- Configure 2nd database connection pool. -->
            <property name="eclipselink.connection-pool.node2.url" value="jdbc:mysql://node2:3306/mysql" />
            <property name="eclipselink.connection-pool.node2.user" value="root" />
            <property name="eclipselink.connection-pool.node2.password" value="password" />
            <property name="eclipselink.connection-pool.node2.initial" value="1" />
            <property name="eclipselink.connection-pool.node2.min" value="64" />
            <property name="eclipselink.connection-pool.node2.max" value="64" />
            
            <!-- Default partioning to replication to allow DDL to be sent to all nodes -->
            <property name="eclipselink.partitioning" value="Replicate" />
            
            <!-- Enabled statement caching, this is only required when using internal connection pooling,
                 when using a DataSource, statement caching must be configured in the DataSource. -->
            <property name="eclipselink.jdbc.cache-statements" value="true" />

            <!-- In JSE no server platform is used, if you wish to use this example is a JEE server with JTA,
                             then you need to set this. -->
            <!-- property name="eclipselink.target-server" value="WebLogic" / -->

            <!-- Caching is disabled for this example to stress the database more. -->
            <property name="eclipselink.cache.shared.default" value="false" />

            <!-- If desired, this option would force a JDBC connection to be held for the duration of an EntityManager,
                 instead of returned to the pool in between queries/transactions. -->
            <!-- property name="eclipselink.jdbc.exclusive-connection.mode" value="Always" / -->

            <!-- Configure database to be created on startup if not already existing. -->
            <!-- property name="eclipselink.ddl-generation" value="create-tables" / -->
            <!-- To drop and replace existing schema this can be used. -->
            <!-- property name="eclipselink.ddl-generation" value="drop-and-create-tables" / -->

            <!-- Configure logging for demonstration. -->
            <!-- property name="eclipselink.logging.level" value="FINE" / -->
        </properties>
    </persistence-unit>
</persistence>