Convert hbm files to orm.xml files

I have a lot of hbm files that I need to convert to orm.xml. I’m trying to use the gradle plugin, but I don’t understand how to use it.

I also have tried this aproach :

package org.example;

import jakarta.xml.bind.JAXBContext;
import jakarta.xml.bind.JAXBException;
import jakarta.xml.bind.Marshaller;
import org.hibernate.boot.jaxb.hbm.transform.HbmXmlTransformer;
import org.hibernate.boot.jaxb.hbm.spi.JaxbHbmHibernateMapping;
import org.hibernate.boot.jaxb.mapping.JaxbEntityMappings;
import org.hibernate.boot.jaxb.Origin;


//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
public class Main {
    public static void main(String[] args) {

        System.setProperty("javax.xml.accessExternalDTD", "all");
        String hbmXmlFilePath = "C:/Users/filipe.gomes.arrais/IdeaProjects/hbmOrmConverter/src/main/Hbm/IrGroup.hbm.xml";

        // Carregar o arquivo .hbm.xml
        File hbmXmlFile = new File(hbmXmlFilePath);

        // Carregar o arquivo .hbm.xml em um objeto JaxbHbmHibernateMapping
        JaxbHbmHibernateMapping hbmXmlMapping = load(hbmXmlFile);
        Origin unknownOrigin = new Origin(null, "<unknown>");

        // Transformar o objeto JaxbHbmHibernateMapping em um objeto JaxbEntityMappings
        JaxbEntityMappings ormXmlMapping = HbmXmlTransformer.transform(hbmXmlMapping, unknownOrigin, null);

        // Salvar o objeto JaxbEntityMappings em um arquivo .orm.xml
        String outputFilePath = hbmXmlFilePath.replace(".hbm.xml", ".orm.xml");
        write(ormXmlMapping, outputFilePath);
        System.out.println("Arquivo .orm.xml gerado com sucesso em: " + outputFilePath);

    private static JaxbHbmHibernateMapping load(File file) {
        try {
            JAXBContext context = JAXBContext.newInstance(JaxbHbmHibernateMapping.class);
            return (JaxbHbmHibernateMapping) context.createUnmarshaller().unmarshal(file);
        } catch (JAXBException e) {
            return null;

    private static void write(JaxbEntityMappings ormMapping, String filePath) {
        try {
            JAXBContext context = JAXBContext.newInstance(JaxbEntityMappings.class);
            Marshaller marshaller = context.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.marshal(ormMapping, new FileOutputStream(filePath));
        } catch (Exception e) {

but didnt work i got this error:
jakarta.xml.bind.UnmarshalException: unexpected element (uri:“”, local:“hibernate-mapping”). Expected elements are <{Index of /xsd/orm/hbm - Hibernate}hibernate-mapping>

Hello, this was recently asked in our forum: Converting hbm.xml to orm.xml.

You don’t need the inputs task parameter for the Gradle plugin, the xml mappings should be on your local classpath as if you were using them normally in your application. You can also use the output of the hbm.xml transformer and manually fill-in the gaps like suggested in the previous topic.