java 如何为 cxf jax-rs 2.0 客户端注册 jackson json 提供程序？
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How to register Hymanson json provider for cxf jax-rs 2.0 client?
提问by Anand Jayabalan
I have a JAX-RS client that's making a simple GET request. I'm using the CXF implementation and Spring for DI. The call is successfull and I get a response code of 200 back. But I'm getting an error when reading the response into my POJO.
我有一个 JAX-RS 客户端，它正在发出一个简单的 GET 请求。我正在使用 CXF 实现和 Spring for DI。呼叫成功，我收到了 200 的响应代码。但是在将响应读入我的 POJO 时出现错误。
Exception:
例外：
[2015-05-08 16:11:55,457][ERROR][org.apache.cxf.jaxrs.utils.JAXRSUtils]: No message body reader has been found for class com.voya.refapp.domain.Customer, ContentType: application/json
[2015-05-08 16:11:55,468][ERROR][com.voya.refapp.service.CustomerServiceImpl]: filterByName() - Exception occurred
javax.ws.rs.client.ResponseProcessingException: No message body reader has been found for class com.voya.refapp.domain.Customer, ContentType: application/json
at org.apache.cxf.jaxrs.impl.ResponseImpl.reportMessageHandlerProblem(ResponseImpl.java:433) ~[cxf-rt-frontend-jaxrs-3.0.4.jar:3.0.4]
at org.apache.cxf.jaxrs.impl.ResponseImpl.doReadEntity(ResponseImpl.java:384) ~[cxf-rt-frontend-jaxrs-3.0.4.jar:3.0.4]
Code:
代码：
Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:8080/rest").path("customers/1");
Invocation.Builder builder = target.request(MediaType.APPLICATION_JSON_TYPE);
Response response = builder.get(); // Successful
Customer customer = response.readEntity(Customer.class); // Fails
I have the below dependency as suggested in this answerin my classpath, it doesn't seem to be picked up automatically.
我在我的类路径中的这个答案中建议了以下依赖项，它似乎没有被自动拾取。
<dependency>
<groupId>com.fasterxml.Hymanson.jaxrs</groupId>
<artifactId>Hymanson-jaxrs-json-provider</artifactId>
</dependency>
I also tried registering the json provider when creating the client:
我还尝试在创建客户端时注册 json 提供程序：
Client client = ClientBuilder.newClient().register(new JacsksonJsonProvider());
and
和
Client client = ClientBuilder.newClient().register(JacsksonJsonProvider.class);
But none of these options worked too. I got a different exception when I registered the json provider using one of the options above:
但是这些选项都没有奏效。当我使用上述选项之一注册 json 提供程序时，我遇到了不同的异常：
javax.ws.rs.client.ResponseProcessingException: Problem with reading the data
Update:
更新：
Registering the json provider worked fine using ClientBuilder.newClient().register(JacsksonJsonProvider.class). The issue was with the data (like the exception above clearly states.. I feel silly now :(). I had boolean field in the json named "active", but it was called "isActive" in the POJO. Once I added the annotation @JsonProperty("active")to the field in POJO, it started working fine
注册 json 提供程序使用ClientBuilder.newClient().register(JacsksonJsonProvider.class). 问题出在数据上（就像上面的异常清楚地说明..我现在觉得很傻:(）。我在 json 中有一个名为“active”的布尔字段，但它在 POJO 中被称为“isActive”。一旦我添加了@JsonProperty("active")POJO 字段的注释，它开始正常工作
回答by Dawid Pytel
AFAIK CXF does not support autodiscoveryof MessageBodyReaderclasses. But registering manually HymansonJsonProvidershould work for you.
AFAIK CXF并没有支持自动发现的MessageBodyReader类。但是手动注册HymansonJsonProvider应该对你有用。
Please check my examplethat works perfectly well. It is almost exactly the same as yours, I just used different service. Maybe you can spot a difference that prevents your version from working correctly.
请检查我的示例，该示例非常有效。它和你的几乎完全一样，我只是使用了不同的服务。也许您可以发现阻止您的版本正常工作的差异。
Client client = ClientBuilder.newClient().register(HymansonJsonProvider.class);
WebTarget target = client.target("http://jsonplaceholder.typicode.com").path("posts/1");
Invocation.Builder builder = target.request(MediaType.APPLICATION_JSON_TYPE);
Response response = builder.get(); // Successful
Post post = response.readEntity(Post.class);
