In our application we have a custom sql exception converter. After the migration from an older version of hibernate to 5.1 it stopped working. It is configured in hibernate.xml as :

<prop key="hibernate.jdbc.sql_exception_converter">com.ourapp.common.CustomHibernateExceptionConverter</prop>

I don't know why but the default one is always used

org.hibernate.exception.internal.StandardSQLExceptionConverter

I've tried to change the content of our custom converter, even using the same content as the default converter but it does not seems to being picked up. If someone encountered this problem thanks for your help in advance.