org.springframework.http.codec.json.Jackson2JsonEncoder Java Examples

@Test
public void encoderDecoderOverrides() {
	Jackson2JsonDecoder jacksonDecoder = new Jackson2JsonDecoder();
	Jackson2JsonEncoder jacksonEncoder = new Jackson2JsonEncoder();
	ProtobufDecoder protobufDecoder = new ProtobufDecoder(ExtensionRegistry.newInstance());
	ProtobufEncoder protobufEncoder = new ProtobufEncoder();
	Jaxb2XmlEncoder jaxb2Encoder = new Jaxb2XmlEncoder();
	Jaxb2XmlDecoder jaxb2Decoder = new Jaxb2XmlDecoder();

	this.configurer.defaultCodecs().jackson2JsonDecoder(jacksonDecoder);
	this.configurer.defaultCodecs().jackson2JsonEncoder(jacksonEncoder);
	this.configurer.defaultCodecs().protobufDecoder(protobufDecoder);
	this.configurer.defaultCodecs().protobufEncoder(protobufEncoder);
	this.configurer.defaultCodecs().jaxb2Decoder(jaxb2Decoder);
	this.configurer.defaultCodecs().jaxb2Encoder(jaxb2Encoder);

	assertDecoderInstance(jacksonDecoder);
	assertDecoderInstance(protobufDecoder);
	assertDecoderInstance(jaxb2Decoder);
	assertEncoderInstance(jacksonEncoder);
	assertEncoderInstance(protobufEncoder);
	assertEncoderInstance(jaxb2Encoder);
}
 

private AbstractMessageWriterResultHandler initResultHandler(HttpMessageWriter<?>... writers) {
	List<HttpMessageWriter<?>> writerList;
	if (ObjectUtils.isEmpty(writers)) {
		writerList = new ArrayList<>();
		writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.allMimeTypes()));
		writerList.add(new ResourceHttpMessageWriter());
		writerList.add(new EncoderHttpMessageWriter<>(new Jaxb2XmlEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(new Jackson2JsonEncoder()));
	}
	else {
		writerList = Arrays.asList(writers);
	}
	RequestedContentTypeResolver resolver = new RequestedContentTypeResolverBuilder().build();
	return new AbstractMessageWriterResultHandler(writerList, resolver) {};
}
 

private ResponseEntityResultHandler createHandler(HttpMessageWriter<?>... writers) {
	List<HttpMessageWriter<?>> writerList;
	if (ObjectUtils.isEmpty(writers)) {
		writerList = new ArrayList<>();
		writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.textPlainOnly()));
		writerList.add(new ResourceHttpMessageWriter());
		writerList.add(new EncoderHttpMessageWriter<>(new Jaxb2XmlEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(new Jackson2JsonEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.allMimeTypes()));
	}
	else {
		writerList = Arrays.asList(writers);
	}
	RequestedContentTypeResolver resolver = new RequestedContentTypeResolverBuilder().build();
	return new ResponseEntityResultHandler(writerList, resolver);
}
 

@Test  // SPR-14899
public void writePojoWithPrettyPrint() {
	ObjectMapper mapper = Jackson2ObjectMapperBuilder.json().indentOutput(true).build();
	this.messageWriter = new ServerSentEventHttpMessageWriter(new Jackson2JsonEncoder(mapper));

	Flux<Pojo> source = Flux.just(new Pojo("foofoo", "barbar"), new Pojo("foofoofoo", "barbarbar"));
	testWrite(source, outputMessage, Pojo.class);

	StepVerifier.create(outputMessage.getBody())
			.consumeNextWith(stringConsumer("data:"))
			.consumeNextWith(stringConsumer("{\n" +
					"data:  \"foo\" : \"foofoo\",\n" +
					"data:  \"bar\" : \"barbar\"\n" + "data:}"))
			.consumeNextWith(stringConsumer("\n"))
			.consumeNextWith(stringConsumer("\n"))
			.consumeNextWith(stringConsumer("data:"))
			.consumeNextWith(stringConsumer("{\n" +
					"data:  \"foo\" : \"foofoofoo\",\n" +
					"data:  \"bar\" : \"barbarbar\"\n" + "data:}"))
			.consumeNextWith(stringConsumer("\n"))
			.consumeNextWith(stringConsumer("\n"))
			.expectComplete()
			.verify();
}
 

@Test
public void defaultWriters() {
	List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
	assertEquals(11, writers.size());
	assertEquals(ByteArrayEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ByteBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(DataBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ResourceHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertStringEncoder(getNextEncoder(writers), true);
	assertEquals(ProtobufHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertEquals(Jackson2JsonEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jackson2SmileEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jaxb2XmlEncoder.class, getNextEncoder(writers).getClass());
	assertSseWriter(writers);
	assertStringEncoder(getNextEncoder(writers), false);
}
 

@Test
public void encoderDecoderOverrides() {
	Jackson2JsonDecoder jacksonDecoder = new Jackson2JsonDecoder();
	Jackson2JsonEncoder jacksonEncoder = new Jackson2JsonEncoder();
	ProtobufDecoder protobufDecoder = new ProtobufDecoder(ExtensionRegistry.newInstance());
	ProtobufEncoder protobufEncoder = new ProtobufEncoder();
	Jaxb2XmlEncoder jaxb2Encoder = new Jaxb2XmlEncoder();
	Jaxb2XmlDecoder jaxb2Decoder = new Jaxb2XmlDecoder();

	this.configurer.defaultCodecs().jackson2JsonDecoder(jacksonDecoder);
	this.configurer.defaultCodecs().jackson2JsonEncoder(jacksonEncoder);
	this.configurer.defaultCodecs().protobufDecoder(protobufDecoder);
	this.configurer.defaultCodecs().protobufEncoder(protobufEncoder);
	this.configurer.defaultCodecs().jaxb2Decoder(jaxb2Decoder);
	this.configurer.defaultCodecs().jaxb2Encoder(jaxb2Encoder);

	assertDecoderInstance(jacksonDecoder);
	assertDecoderInstance(protobufDecoder);
	assertDecoderInstance(jaxb2Decoder);
	assertEncoderInstance(jacksonEncoder);
	assertEncoderInstance(protobufEncoder);
	assertEncoderInstance(jaxb2Encoder);
}
 

@Test
public void defaultWriters() {
	List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
	assertEquals(11, writers.size());
	assertEquals(ByteArrayEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ByteBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(DataBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ResourceHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertStringEncoder(getNextEncoder(writers), true);
	assertEquals(MultipartHttpMessageWriter.class, writers.get(this.index.getAndIncrement()).getClass());
	assertEquals(ProtobufHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertEquals(Jackson2JsonEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jackson2SmileEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jaxb2XmlEncoder.class, getNextEncoder(writers).getClass());
	assertStringEncoder(getNextEncoder(writers), false);
}
 

@Test
public void defaultWriters() {
	List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
	assertEquals(11, writers.size());
	assertEquals(ByteArrayEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ByteBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(DataBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ResourceHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertStringEncoder(getNextEncoder(writers), true);
	assertEquals(MultipartHttpMessageWriter.class, writers.get(this.index.getAndIncrement()).getClass());
	assertEquals(ProtobufHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertEquals(Jackson2JsonEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jackson2SmileEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jaxb2XmlEncoder.class, getNextEncoder(writers).getClass());
	assertStringEncoder(getNextEncoder(writers), false);
}
 

@Test
public void defaultWriters() {
	List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
	assertEquals(11, writers.size());
	assertEquals(ByteArrayEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ByteBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(DataBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ResourceHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertStringEncoder(getNextEncoder(writers), true);
	assertEquals(ProtobufHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertEquals(Jackson2JsonEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jackson2SmileEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jaxb2XmlEncoder.class, getNextEncoder(writers).getClass());
	assertSseWriter(writers);
	assertStringEncoder(getNextEncoder(writers), false);
}
 

@Test  // SPR-14899
public void writePojoWithPrettyPrint() {
	ObjectMapper mapper = Jackson2ObjectMapperBuilder.json().indentOutput(true).build();
	this.messageWriter = new ServerSentEventHttpMessageWriter(new Jackson2JsonEncoder(mapper));

	Flux<Pojo> source = Flux.just(new Pojo("foofoo", "barbar"), new Pojo("foofoofoo", "barbarbar"));
	testWrite(source, outputMessage, Pojo.class);

	StepVerifier.create(outputMessage.getBody())
			.consumeNextWith(stringConsumer("data:{\n" +
					"data:  \"foo\" : \"foofoo\",\n" +
					"data:  \"bar\" : \"barbar\"\n" + "data:}\n\n"))
			.consumeNextWith(stringConsumer("data:{\n" +
					"data:  \"foo\" : \"foofoofoo\",\n" +
					"data:  \"bar\" : \"barbarbar\"\n" + "data:}\n\n"))
			.expectComplete()
			.verify();
}
 

private AbstractMessageWriterResultHandler initResultHandler(HttpMessageWriter<?>... writers) {
	List<HttpMessageWriter<?>> writerList;
	if (ObjectUtils.isEmpty(writers)) {
		writerList = new ArrayList<>();
		writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.allMimeTypes()));
		writerList.add(new ResourceHttpMessageWriter());
		writerList.add(new EncoderHttpMessageWriter<>(new Jaxb2XmlEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(new Jackson2JsonEncoder()));
	}
	else {
		writerList = Arrays.asList(writers);
	}
	RequestedContentTypeResolver resolver = new RequestedContentTypeResolverBuilder().build();
	return new AbstractMessageWriterResultHandler(writerList, resolver) {};
}
 

private ResponseEntityResultHandler createHandler(HttpMessageWriter<?>... writers) {
	List<HttpMessageWriter<?>> writerList;
	if (ObjectUtils.isEmpty(writers)) {
		writerList = new ArrayList<>();
		writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.textPlainOnly()));
		writerList.add(new ResourceHttpMessageWriter());
		writerList.add(new EncoderHttpMessageWriter<>(new Jaxb2XmlEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(new Jackson2JsonEncoder()));
		writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.allMimeTypes()));
	}
	else {
		writerList = Arrays.asList(writers);
	}
	RequestedContentTypeResolver resolver = new RequestedContentTypeResolverBuilder().build();
	return new ResponseEntityResultHandler(writerList, resolver);
}
 

@Override
protected void register(GenericApplicationContext context, CodecConfigurer configurer) {
	ObjectMapper mapper = context.getBean(ObjectMapper.class);
	Jackson2JsonEncoder encoder = new Jackson2JsonEncoder(mapper);
	configurer.customCodecs().decoder(new Jackson2JsonDecoder(mapper));
	configurer.customCodecs().encoder(encoder);
	configurer.customCodecs().writer(new ServerSentEventHttpMessageWriter(encoder));
}
 

/**
* Build the RestTemplate used to make HTTP requests.
* @return RestTemplate
*/
public static WebClient buildWebClient(ObjectMapper mapper) {
    ExchangeStrategies strategies = ExchangeStrategies
        .builder()
        .codecs(clientDefaultCodecsConfigurer -> {
            clientDefaultCodecsConfigurer.defaultCodecs().jackson2JsonEncoder(new Jackson2JsonEncoder(mapper, MediaType.APPLICATION_JSON));
            clientDefaultCodecsConfigurer.defaultCodecs().jackson2JsonDecoder(new Jackson2JsonDecoder(mapper, MediaType.APPLICATION_JSON));
        }).build();
    WebClient.Builder webClient = WebClient.builder().exchangeStrategies(strategies);
    return webClient.build();
}
 

@Test
public void defaultViews() throws Exception {
	View view = new HttpMessageWriterView(new Jackson2JsonEncoder());
	this.registry.defaultViews(view);

	assertEquals(1, this.registry.getDefaultViews().size());
	assertSame(view, this.registry.getDefaultViews().get(0));
}
 

@Test
public void defaultAndCustomWriters() {
	Encoder<?> customEncoder1 = mock(Encoder.class);
	Encoder<?> customEncoder2 = mock(Encoder.class);

	when(customEncoder1.canEncode(ResolvableType.forClass(Object.class), null)).thenReturn(false);
	when(customEncoder2.canEncode(ResolvableType.forClass(Object.class), null)).thenReturn(true);

	HttpMessageWriter<?> customWriter1 = mock(HttpMessageWriter.class);
	HttpMessageWriter<?> customWriter2 = mock(HttpMessageWriter.class);

	when(customWriter1.canWrite(ResolvableType.forClass(Object.class), null)).thenReturn(false);
	when(customWriter2.canWrite(ResolvableType.forClass(Object.class), null)).thenReturn(true);

	this.configurer.customCodecs().encoder(customEncoder1);
	this.configurer.customCodecs().encoder(customEncoder2);

	this.configurer.customCodecs().writer(customWriter1);
	this.configurer.customCodecs().writer(customWriter2);

	List<HttpMessageWriter<?>> writers = this.configurer.getWriters();

	assertEquals(14, writers.size());
	assertEquals(ByteArrayEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ByteBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(DataBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ResourceHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertEquals(CharSequenceEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ProtobufHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertSame(customEncoder1, getNextEncoder(writers));
	assertSame(customWriter1, writers.get(this.index.getAndIncrement()));
	assertEquals(Jackson2JsonEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jackson2SmileEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jaxb2XmlEncoder.class, getNextEncoder(writers).getClass());
	assertSame(customEncoder2, getNextEncoder(writers));
	assertSame(customWriter2, writers.get(this.index.getAndIncrement()));
	assertEquals(CharSequenceEncoder.class, getNextEncoder(writers).getClass());
}
 

public static final void main(String[] args) throws IOException {
        WebClient client = WebClient.builder()
                //see: https://github.com/jetty-project/jetty-reactive-httpclient
                //.clientConnector(new JettyClientHttpConnector())
                .clientConnector(new ReactorClientHttpConnector())
                .codecs(
                        clientCodecConfigurer ->{
                            // use defaultCodecs() to apply DefaultCodecs
                            // clientCodecConfigurer.defaultCodecs();

                            // alter a registered encoder/decoder based on the default config.
                            // clientCodecConfigurer.defaultCodecs().jackson2Encoder(...)

                            // Or
                            // use customCodecs to register Codecs from scratch.
                            clientCodecConfigurer.customCodecs().register(new Jackson2JsonDecoder());
                            clientCodecConfigurer.customCodecs().register(new Jackson2JsonEncoder());
                        }

                )
                .exchangeStrategies(ExchangeStrategies.withDefaults())
//                .exchangeFunction(ExchangeFunctions.create(new ReactorClientHttpConnector())
//                        .filter(ExchangeFilterFunction.ofRequestProcessor(clientRequest -> {})))
//                .filter(ExchangeFilterFunction.ofRequestProcessor(clientRequest -> {clientRequest.}))
                //.defaultHeaders(httpHeaders -> httpHeaders.addAll())
                .baseUrl("http://localhost:8080")
                .build();
        client
            .get()
            .uri("/posts")
            .exchange()
            .flatMapMany(res -> res.bodyToFlux(Post.class))
            .log()
            .subscribe(post -> System.out.println("post: " + post));

        System.out.println("Client is started!");
        System.in.read();
    }
 

@Test
public void defaultWriters() {
	List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
	assertEquals(10, writers.size());
	assertEquals(ByteArrayEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ByteBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(DataBufferEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(ResourceHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertStringEncoder(getNextEncoder(writers), true);
	assertEquals(ProtobufHttpMessageWriter.class, writers.get(index.getAndIncrement()).getClass());
	assertEquals(Jackson2JsonEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jackson2SmileEncoder.class, getNextEncoder(writers).getClass());
	assertEquals(Jaxb2XmlEncoder.class, getNextEncoder(writers).getClass());
	assertStringEncoder(getNextEncoder(writers), false);
}
 

private static WebClient.Builder buildWebClient(String baseUri, ClientHttpConnector clientHttpConnector) {
	ExchangeStrategies strategies = ExchangeStrategies.builder().codecs((configurer) -> {
		ObjectMapper mapper = JsonUtils.buildObjectMapper();

		CodecConfigurer.DefaultCodecs dc = configurer.defaultCodecs();
		dc.jackson2JsonDecoder(new Jackson2JsonDecoder(mapper));
		dc.jackson2JsonEncoder(new Jackson2JsonEncoder(mapper));
	}).build();

	return WebClient.builder().clientConnector(clientHttpConnector).baseUrl(baseUri)
			.defaultHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
			.defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
			.exchangeStrategies(strategies);
}
 

private void assertSseWriter(List<HttpMessageWriter<?>> writers) {
	HttpMessageWriter<?> writer = writers.get(this.index.getAndIncrement());
	assertEquals(ServerSentEventHttpMessageWriter.class, writer.getClass());
	Encoder<?> encoder = ((ServerSentEventHttpMessageWriter) writer).getEncoder();
	assertNotNull(encoder);
	assertEquals(Jackson2JsonEncoder.class, encoder.getClass());
}
 

@Test
public void jackson2EncoderOverride() {
	Jackson2JsonEncoder encoder = new Jackson2JsonEncoder();
	this.configurer.defaultCodecs().jackson2JsonEncoder(encoder);

	assertSame(encoder, this.configurer.getWriters().stream()
			.filter(writer -> ServerSentEventHttpMessageWriter.class.equals(writer.getClass()))
			.map(writer -> (ServerSentEventHttpMessageWriter) writer)
			.findFirst()
			.map(ServerSentEventHttpMessageWriter::getEncoder)
			.filter(e -> e == encoder).orElse(null));
}
 

private void setExchangeStrategies(WebClient.Builder builder) {
	ObjectMapper objectMapper = objectMapper();
	ExchangeStrategies strategies = ExchangeStrategies.builder()
			.codecs(clientDefaultCodecsConfigurer -> {
				clientDefaultCodecsConfigurer.defaultCodecs()
						.jackson2JsonEncoder(new Jackson2JsonEncoder(objectMapper,
								MediaType.APPLICATION_JSON));
				clientDefaultCodecsConfigurer.defaultCodecs()
						.jackson2JsonDecoder(new Jackson2JsonDecoder(objectMapper,
								MediaType.APPLICATION_JSON));

			}).build();
	builder.exchangeStrategies(strategies);
}
 

@GetMapping("/publisher")
public Publisher<ByteBuffer> getPublisher() {
	DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();
	Jackson2JsonEncoder encoder = new Jackson2JsonEncoder();
	return encoder.encode(Mono.just(new Person("Robert")), dataBufferFactory,
			ResolvableType.forClass(Person.class), JSON, Collections.emptyMap()).map(DataBuffer::asByteBuffer);
}
 

private WebTestClient createWebClient(int port) {
	ObjectMapper mapper = new ObjectMapper().registerModule(new JsonOrgModule());
	return WebTestClient.bindToServer().baseUrl("http://localhost:" + port)
			.exchangeStrategies(ExchangeStrategies.builder().codecs((configurer) -> {
				configurer.defaultCodecs().jackson2JsonDecoder(new Jackson2JsonDecoder(mapper));
				configurer.defaultCodecs().jackson2JsonEncoder(new Jackson2JsonEncoder(mapper));
			}).build()).build();
}
 

protected WebTestClient createWebClient(int port) {
	ObjectMapper mapper = new ObjectMapper().registerModule(new JsonOrgModule());
	return WebTestClient.bindToServer().baseUrl("http://localhost:" + port)
			.exchangeStrategies(ExchangeStrategies.builder().codecs((configurer) -> {
				configurer.defaultCodecs().jackson2JsonDecoder(new Jackson2JsonDecoder(mapper));
				configurer.defaultCodecs().jackson2JsonEncoder(new Jackson2JsonEncoder(mapper));
			}).build()).build();
}
 

@Before
public void createContext() {
	final List<HttpMessageWriter<?>> messageWriters = new ArrayList<>();
	messageWriters.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
	messageWriters.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.textPlainOnly()));
	messageWriters.add(new ResourceHttpMessageWriter());
	messageWriters.add(new EncoderHttpMessageWriter<>(new Jaxb2XmlEncoder()));
	Jackson2JsonEncoder jsonEncoder = new Jackson2JsonEncoder();
	messageWriters.add(new EncoderHttpMessageWriter<>(jsonEncoder));
	messageWriters.add(new ServerSentEventHttpMessageWriter(jsonEncoder));
	messageWriters.add(new FormHttpMessageWriter());
	messageWriters.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.allMimeTypes()));
	messageWriters.add(new MultipartHttpMessageWriter(messageWriters));

	this.context = new BodyInserter.Context() {
		@Override
		public List<HttpMessageWriter<?>> messageWriters() {
			return messageWriters;
		}
		@Override
		public Optional<ServerHttpRequest> serverRequest() {
			return Optional.empty();
		}
		@Override
		public Map<String, Object> hints() {
			return hints;
		}
	};
	this.hints = new HashMap<>();
}
 

@Test
public void defaultViews() throws Exception {
	View view = new HttpMessageWriterView(new Jackson2JsonEncoder());
	this.registry.defaultViews(view);

	assertEquals(1, this.registry.getDefaultViews().size());
	assertSame(view, this.registry.getDefaultViews().get(0));
}
 

@Before
public void setup() throws Exception {
	List<HttpMessageWriter<?>> writerList = new ArrayList<>(5);
	writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
	writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.allMimeTypes()));
	writerList.add(new ResourceHttpMessageWriter());
	writerList.add(new EncoderHttpMessageWriter<>(new Jaxb2XmlEncoder()));
	writerList.add(new EncoderHttpMessageWriter<>(new Jackson2JsonEncoder()));
	RequestedContentTypeResolver resolver = new RequestedContentTypeResolverBuilder().build();
	this.resultHandler = new ResponseBodyResultHandler(writerList, resolver);
}
 

@GetMapping("/publisher")
public Publisher<ByteBuffer> getPublisher() {
	DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();
	Jackson2JsonEncoder encoder = new Jackson2JsonEncoder();
	return encoder.encode(Mono.just(new Person("Robert")), dataBufferFactory,
			ResolvableType.forClass(Person.class), JSON, Collections.emptyMap()).map(DataBuffer::asByteBuffer);
}
 

@Test // gh-22107
public void cancelWithJackson() {
	Jackson2JsonEncoder encoder = new Jackson2JsonEncoder();

	Flux<DataBuffer> flux = encoder.encode(Flux.just(new Pojo("foofoo", "barbar"), new Pojo("bar", "baz")),
			this.bufferFactory, ResolvableType.forClass(Pojo.class),
			MediaType.APPLICATION_JSON, Collections.emptyMap());

	BaseSubscriber<DataBuffer> subscriber = new ZeroDemandSubscriber();
	flux.subscribe(subscriber); // Assume sync execution (e.g. encoding with Flux.just)..
	subscriber.cancel();
}