java - 没有可用于接口(interface)列表和 MIME 媒体类型 application/json with UTF-8 的阅读器

Question

我进行了 REST 调用，我想取回包含 MyClass 对象列表的 json。实际上我得到了这个异常(exception):

{"error":"A message body reader for Java class java.util.List, and Java type interface java.util.List, and MIME media type application/json; charset=UTF-8 was not found","type":"com.sun.jersey.api.client.ClientHandlerException","stackTrace":"com.sun.jersey.api.client.ClientHandlerException: A message body reader for Java class java.util.List, and Java type interface java.util.List, and MIME media type application/json; charset=UTF-8 was not found\n\tat com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:550)\n\tat com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:506)\n\tat com.sun.jersey.api.client.WebResource.handle(WebResource.java:684)\n\tat com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)\n\tat com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:507)\n\tat ..[more stack trace]..}

代码是:

public List<'MyClass> getLIst()
{

ClientConfig config = new DefaultClientConfig();
config.getClasses().add(MyObjectMapper.class);
Client client = Client.create(config);

WebResource resource = client.resource(HOST_PATH).path(PATH).type(MediaType.APPLICATION_JSON_TYPE).accept(MediaType.APPLICATION_JSON_TYPE);

return resource.get(List.class);
}

@XmlRootElement
public class MyClass
{ ... }

我错过了什么吗？

Answer 1

是的，由于 Java 中的类型删除，Jersey 看不到列表是什么类型。您应该按如下方式更改 getList() 方法的最后一行:

return resource.get(new GenericType<List<MyClass>>() {});

那么它应该可以工作了。