cache/src/META-INF/data-cache.xml

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings version="2.4"
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/orm"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <entity class="model.Order">
        <cache isolation="PROTECTED"/>
        <attributes>
            <many-to-one name="customer" fetch="LAZY">
                <cascade>
                    <cascade-persist/>
                </cascade>
                <noncacheable/>
            </many-to-one>
            <one-to-many name="orderLines" fetch="LAZY" mapped-by="order" orphan-removal="true">
                <cascade>
                    <cascade-all/>
                </cascade>
                <noncacheable/>
            </one-to-many>
        </attributes>
    </entity>
    <entity class="model.OrderLine">
        <cache isolation="PROTECTED"/>
    </entity>
    <entity class="model.Customer">
        <cache isolation="PROTECTED"/>
    </entity>

</entity-mappings>