code: private static Object getFieldValue(final Object classInstance, final Field classField) {
      try {
        return classField.get(classInstance);
      } catch (IllegalArgumentException ex) {
        throw new JBBPMapperException("Can't set get value from a mapping field", null, classInstance.getClass(), classField, ex);
      } catch (IllegalAccessException ex) {
        throw new JBBPMapperException("Can't get access to a mapping field", null, classInstance.getClass(), classField, ex);
      }
    }
docs: Get a value of a field from a class instance.
  
  @param classInstance a class instance object
  @param classField    a class field which value must be returned, must not be
  null
  @return the field value for the class instance