<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm
                                     http://java.sun.com/xml/ns/persistence/orm_2_0.xsd" version="2.0">
    <persistence-unit-metadata>
        <persistence-unit-defaults>
            <entity-listeners>
                <entity-listener class="bo.DebugListener">
                    <pre-persist method-name="prePersist"></pre-persist>
                    <post-persist method-name="postPersist"></post-persist>
                    <pre-remove method-name="preRemove"></pre-remove>
                    <post-remove method-name="postRemove"></post-remove>
                    <pre-update method-name="preUpdate"></pre-update>
                    <post-update method-name="postUpdate"></post-update>
                    <post-load method-name="postLoad"></post-load>
                </entity-listener>
            </entity-listeners>
        </persistence-unit-defaults>
    </persistence-unit-metadata>
</entity-mappings>

public class DebugListener {

    public DebugListener() {
        System.out.println(">>>>>>>>>>>>>>> CONSTRUCTOR");
    }

    public void prePersist(Object o) {
        System.out.println(">>>>>>>>>>>>>>> " + o.getClass() + " PREPERSIST");
    }

    public void postPersist(Object o) {
        System.out.println(">>>>>>>>>>>>>>> " + o.getClass() + " POSTPERSIST");
    }

    public void preUpdate(Object o) {
        System.out.println(">>>>>>>>>>>>>>> " + o.getClass() + " PREUPDATE");
    }

    public void postUpdate(Object o) {
        System.out.println(">>>>>>>>>>>>>>> " + o.getClass() + " POSTUPDATE");
    }

    public void preRemove(Object o) {
        System.out.println(">>>>>>>>>>>>>>> " + o.getClass() + " PREREMOVE");
    }

    public void postRemove(Object o) {
        System.out.println(">>>>>>>>>>>>>>> " + o.getClass() + " POSTREMOVE");
    }

    public void postLoad(Object o) {
        System.out.println(">>>>>>>>>>>>>>> " + o.getClass() + " POSTLOAD");
    }
}