axelor model entity listener, using events like preremove

Message.xml

<?xml version="1.0" encoding="UTF-8"?>
<domain-models xmlns="http://axelor.com/xml/ns/domain-models"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://axelor.com/xml/ns/domain-models http://axelor.com/xml/ns/domain-models/domain-models_5.4.xsd">

  <module name="message" package="com.axelor.apps.message.db"/>

  <entity name="Message">
    <entity-listener class="com.edgesyn.message.db.repo.MessageListener"/>
  </entity>

</domain-models>

MessageListener.java

package com.edgesyn.message.db.repo;

import com.axelor.apps.message.db.Message;
import com.google.inject.persist.Transactional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import javax.persistence.PreRemove;
import java.lang.invoke.MethodHandles;

public class MessageListener {

  private final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

  // Called upon PostPersist or PostUpdate events on Message objects.
  @PreRemove
  @Transactional(rollbackOn = {Exception.class})
  private void onPreRemove(Message message)  {

    log.debug("before removing " + message.getId());

  }
}