How to use

PersistenceExceptionConverter

in

org.keycloak.models.jpa

@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
  try {
    return method.invoke(em, args);
  } catch (InvocationTargetException e) {
    throw convert(e.getCause());
  }
}

public static EntityManager create(EntityManager em) {
  return (EntityManager) Proxy.newProxyInstance(EntityManager.class.getClassLoader(), new Class[]{EntityManager.class}, new PersistenceExceptionConverter(em));
}