docs: private void ensureLength(FieldDescriptorDef fieldDef, String checkLevel)
      {
          if (!fieldDef.hasProperty(PropertyHelper.OJB_PROPERTY_LENGTH))
          {
              String defaultLength = JdbcTypeHelper.getDefaultLengthFor(fieldDef.getProperty(PropertyHelper.OJB_PROPERTY_JDBC_TYPE));
  
              if (defaultLength != null)
              {
                  LogHelper.warn(true,
                                 FieldDescriptorConstraints.class,
                                 "ensureLength",
                                 "The field "+fieldDef.getName()+" in class "+fieldDef.getOwner().getName()+" has no length setting though its jdbc type requires it (in most databases); using default length of "+defaultLength);
                  fieldDef.setProperty(PropertyHelper.OJB_PROPERTY_LENGTH, defaultLength);
              }
          }
      }