Play 2.2.X + JPA + Hibernate DB migration bootstrapper

DBMigrationMR.java

package util.plugins;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import org.hibernate.HibernateException;
import org.hibernate.ejb.Ejb3Configuration;
import org.hibernate.tool.hbm2ddl.SchemaUpdate;
import org.hibernate.tool.hbm2ddl.SchemaValidator;
import org.hibernate.tool.hbm2ddl.Target;

import play.Application;
import play.Configuration;
import play.Logger;
import play.api.Plugin;

public class DBMigrationMR implements Plugin {

    private final Application application;

    public DBMigrationMR(Application application) {
        this.application = application;
    }

    private final Map<String, org.hibernate.cfg.Configuration> hibernateConfs =
            new HashMap<String, org.hibernate.cfg.Configuration>();

    @Override
    public boolean enabled() {
        return true;
    }

    private void initHibernateConfs() {
        Ejb3Configuration cfg = null;
        Configuration jpaConf = Configuration.root().getConfig("jpa");
        for (String key : jpaConf.keys()) {
            String persistenceUnit = jpaConf.getString(key);
            cfg = new Ejb3Configuration();
            Ejb3Configuration configure = cfg.configure(persistenceUnit, null);
            hibernateConfs.put(persistenceUnit, configure.getHibernateConfiguration());
        }

    }

    @Override
    public void onStart() {
        boolean interrupt = false;
        Logger.info("Initing DBMigrationMR");
        initHibernateConfs();
        //let's validate the schema now for each one
        for (String pUnit : hibernateConfs.keySet()) {
            org.hibernate.cfg.Configuration cfg = hibernateConfs.get(pUnit);
            SchemaValidator schemaValidator = new SchemaValidator(cfg);
            try {
                schemaValidator.validate();
            } catch (HibernateException ex) {
                interrupt = true;
                SchemaUpdate schemaUpdate = new SchemaUpdate(cfg);
                File outputFile = application.getFile("conf/db/migration" + pUnit + ".sql");
                Logger.warn(pUnit + " persistence unit isn't valid. Dumping migration SQL to " + outputFile.getAbsolutePath(), ex);
                schemaUpdate.setOutputFile(outputFile.getAbsolutePath());
                schemaUpdate.setDelimiter(";");
                schemaUpdate.execute(Target.SCRIPT);
            }
        }

        if (interrupt) {
            //Logger.error("Killing off application");
            //Play.stop();
        }


    }

    @Override
    public void onStop() {
        // TODO Auto-generated method stub

    }

}

Please let me know what you think about it, also, be sure to comment the link for further improvements you might have done, or give hints/suggestions.
My blog post explaining this can be found here: http://web.ist.utl.pt/~joao.a.p.antunes/2014/08/09/play-2-2-x-jpa-hibernate-database-migration