vomit.java

public class MyClass {
  @Autowired
  private ConvertAToB convertAToB;

  @Autowired
  private ConvertBToC convertBToC;

  @Autowired
  private ConvertCToD convertCToD;

  private <T,R>  convertObject(T inputObject, Function<T, Optional<R>> resultConvertor) {
    try {
      Optional<R> destOptional = resultConvertor.apply(inputObject);
      if (destOptional == null || !destOptional.isPresent()) {
        // need to pass Class<R> clazz variable to be able to get the dest type
        // at the runtime in Java
        throw new ConversionException("Failed to convert object", inputObject);
        // or return Optional.empty();
      }
      return destOptional.get();
    } catch (...Exception | ...Exception e) {
      throw new ConversionException("Failed to convert object", inputObject, e);
    }
  }

  public Optional convertAToD(ObjectA objectA) throws ConversionException {
    if(objectA == null) {
      throw new IllegalArgumentException("objectA shall not be null");
    }
    try {
      TypeB objectB = convertObject(objectA, convertAToB::convertAtoB);
      TypeC objectC = convertObject(objectB, convertBToC::convertBtoC);
      TypeD objectD = convertObject(objectC, convertCToD::convertCtoD);
    } catch (ConversionException e) {
      return Optional.empty();
      // or throw e;
    }
  }
}