private TwillSpecificationAdapter() {
gson = new GsonBuilder()
.serializeNulls()
.registerTypeAdapter(TwillSpecification.class, new TwillSpecificationCodec())
.registerTypeAdapter(TwillSpecification.Order.class, new TwillSpecificationOrderCoder())
.registerTypeAdapter(EventHandlerSpecification.class, new EventHandlerSpecificationCoder())
.registerTypeAdapter(RuntimeSpecification.class, new RuntimeSpecificationCodec())
.registerTypeAdapter(TwillRunnableSpecification.class, new TwillRunnableSpecificationCodec())
.registerTypeAdapter(ResourceSpecification.class, new ResourceSpecificationCodec())
.registerTypeAdapter(LocalFile.class, new LocalFileCodec())