<datasources>

                <datasource jndi-name="java:/MySQLDS" pool-name="MySQLDS" enabled="true" use-java-context="true">
                    <connection-url>jdbc:mysql://localhost:3306/opera</connection-url>
                    <driver>mysqlDriver</driver>
                    <security>
                        <user-name>root</user-name>
                        <password>root</password>
                    </security>
                </datasource>
                <drivers>

                    <driver name="mysqlDriver" module="com.mysql">
                        <xa-datasource-class>com.mysql.jdbc.Driver</xa-datasource-class>
                    </driver>
                </drivers>
            </datasources>

<persistence version="2.0"
        xmlns="http://java.sun.com/xml/ns/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">
        <persistence-unit name="metadatatool-persistence">
            <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <properties>
                <!-- Hibernate properties -->
                <property name="hibernate.show_sql" value="false" />
                <property name="hibernate.format_sql" value="false" />
                <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />


                <!-- Configuring Connection Pool -->
                <property name="hibernate.c3p0.min_size" value="5" />
                <property name="hibernate.c3p0.max_size" value="20" />
                <property name="hibernate.c3p0.timeout" value="600" />
                <property name="hibernate.c3p0.max_statements" value="2000" />
                <property name="hibernate.c3p0.idle_test_period" value="30" />
                <property name="hibernat.c3p0.automaticTestTable" value="conTestTable" />
            </properties>
    </persistence-unit>
    </persistence>