How to map Java class to Oracle custom type to use as IN parameter in stored procedure?

I'm trying to use a custom object in oracledb as IN parameter for a procedure, but I'm having issues sending it from my java application

I tried mapping the DTO class directly in query.registerStoredProcedureParameter(1, CustomClass.class, ParameterMode.IN);

Also I didn't find this particular question in stackoverflow

Java code:

    private String executeSP(CustomClass dto) {
    StoredProcedureQuery query = em.createStoredProcedureQuery("PACKAGE.SOMEPROCEDURE");
    query.registerStoredProcedureParameter(1, CustomClass.class, ParameterMode.IN);
    query.registerStoredProcedureParameter(2, String.class, ParameterMode.OUT);

    // Pass the parameter values
    query.setParameter(1, dto);

    // Execute query
    query.execute();

    // Get output parameters
    String response = (String) query.getOutputParameterValue(2);

    System.out.println(response);
    return response;
}

PL SQL Procedure:

PROCEDURE SOMEPROCEDURE (
  P_DTO                  IN     DTOTYPE (previously created)
  P_RESULT                  OUT     VARCHAR2);

Expected result: Hibernate maps the dto to the oracle custom object Actual result: org.hibernate.MappingException: Unknown entity

Copyright Notice：Content Author:「DarioJ」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/57381082/how-to-map-java-class-to-oracle-custom-type-to-use-as-in-parameter-in-stored-pro