Jersey：找不到媒體類型= application / json的MessageBodyWriter，類型= class org.codehaus.jackson.node.ObjectNode？

Question

我使用Jersey 2.8 Client將數據發布到RESTful端點。 代碼看起來像

    final Client client = ClientBuilder.newClient();
    final WebTarget target = client.target(url).path("inventorySummary");
    final Invocation.Builder builder = target.request().header("Content-Type", MediaType.APPLICATION_JSON);

    final ObjectNode payload = getObjectMapper().createObjectNode();
    payload.put("startDate", DateTime.now().toString());
    payload.put("endDate", DateTime.now().plusDays(30).toString());
    payload.put("networkId", 0);

    final Response response = builder.accept(MediaType.APPLICATION_JSON).post(Entity.entity(payload, MediaType.APPLICATION_JSON));
    assertStatus(Response.Status.OK.getStatusCode(), response);
    final JsonNode jsonReply = parseResponse(response);

getObjectMapper（）看起來像

public ObjectMapper getObjectMapper() {
        return new ObjectMapper()
                .configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false /* force ISO8601 */)
                .configure(SerializationConfig.Feature.WRITE_ENUMS_USING_TO_STRING, true)
                .configure(DeserializationConfig.Feature.READ_ENUMS_USING_TO_STRING, true)
                .setSerializationInclusion(JsonSerialize.Inclusion.ALWAYS);
    }

當我嘗試運行測試時，我看到錯誤為

MessageBodyWriter not found for media type=application/json, type=class org.codehaus.jackson.node.ObjectNode, genericType=class org.codehaus.jackson.node.ObjectNode

我在這里錯過了什么？

謝謝

Answer 1

如果你可以使用Jackson 1.x，那么你需要做以下3件事。

1.將Jersey Jackson添加到你的pom.xml：

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.8</version>
</dependency>

2.創建ContextResolver ：

@Provider
public class ObjectMapperProvider implements ContextResolver<ObjectMapper> {

    final ObjectMapper defaultObjectMapper;

    public ObjectMapperProvider() {
        defaultObjectMapper = getObjectMapper();
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return defaultObjectMapper;
    }

    public static ObjectMapper getObjectMapper() {
        return new ObjectMapper()
                .configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false /* force ISO8601 */)
                .configure(SerializationConfig.Feature.WRITE_ENUMS_USING_TO_STRING, true)
                .configure(DeserializationConfig.Feature.READ_ENUMS_USING_TO_STRING, true)
                .setSerializationInclusion(JsonSerialize.Inclusion.ALWAYS);
    }
}

3.使用ClientBuilder注冊提供程序：

final Client client = ClientBuilder.newBuilder()
        .register(ObjectMapperProvider.class)
        .register(JacksonFeature.class)
        .build();

final WebTarget target = client.target(url).path("inventorySummary");

final ObjectNode payload = ObjectMapperProvider.getObjectMapper().createObjectNode();
payload.put("startDate", DateTime.now().toString());
payload.put("endDate", DateTime.now().plusDays(30).toString());
payload.put("networkId", 0);

final Response response = target.request(MediaType.APPLICATION_JSON)
                                .post(Entity.json(payload));

assertStatus(Response.Status.OK.getStatusCode(), response);

Answer 2

我在上面添加了一條評論，說明X的添加有效。

但是，將以下maven依賴項添加到pom.xml也可以，並且看起來像是一個更標准的修復。

     <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-moxy</artifactId>
    </dependency>

注意：默認情況下， org.glassfish.jersey.archetypes / jersey-quickstart-grizzly maven原型添加了上面的依賴項，但注釋掉了“取消注釋以獲得JSON支持” 。

Answer 3

嘗試從運行PHP的Apache服務器獲取響應時，我遇到了同樣的問題。 我對服務器的反應很好，但Spring抱怨找不到類型為application / json的MessageBodyWriter。 我將Genson依賴項添加到我的pom.xml中並修復了它！

    <dependency>
        <groupId>com.owlike</groupId>
        <artifactId>genson</artifactId>
        <version>0.99</version>
    </dependency>

有關文檔， 請訪問： https ： //code.google.com/p/genson/

Answer 4

嘗試將ObjectNode編寫為String：

// your code
final ObjectNode payload = getObjectMapper().createObjectNode();
payload.put("startDate", DateTime.now().toString());
payload.put("endDate", DateTime.now().plusDays(30).toString());
payload.put("networkId", 0);

// the solution
String entity = getObjectMapper().writeValueAsString(payload);

final Response response = builder.accept(MediaType.APPLICATION_JSON).post(Entity.entity(entity, MediaType.APPLICATION_JSON));