private Long findSerialVersionUID() {
    for (VariableElement field : ElementFilter.fieldsIn(element.getEnclosedElements())) {
      if (field.getSimpleName().contentEquals(SERIAL_VERSION_FIELD_NAME)
          && field.asType().getKind() == TypeKind.LONG) {
        return (Long) field.getConstantValue();
      }
    }
    return null;
  }
Should be called when it is known that there type adapters generation provided.
@return the type adapters annotation
value-processor/src/org/immutables/value/processor/meta/ValueType.java