未找到有关类的消息正文编写器：类java.util.HashMap

Question

I am trying to consume a JAXRS endpoint. here is what I tried to make it work.

Map<String, String> variables = new HashMap<String, String>();
variables.put("email", "sample@gmail.com");     
List<Object> providers = new ArrayList<Object>();
JSONProvider provider = new JSONProvider();
provider.setNamespaceMap(variables);
providers.add(provider);

WebClient plainAddClient = WebClient.create("http://hostname:portnumber/cxf/jaxrs/EmailService/subscriber/update", providers);
plainAddClient.accept("application/json").type("application/json").post(variables);

when I try to run the above snippet, I get the following exception:

org.apache.cxf.jaxrs.client.AbstractClient.reportNoMessageHandler(AbstractClient.java:486) - .No message body writer found for class : class java.util.HashMap.

I have no clue whats going wrong with my approach. Thanks for any suggestion.

Answer 1

Seems to me like you're attempting to send json to the server but actually sending the HashMap instead? Is your message body correctly converted to json before sending it?

Maybe try to send plain json for testing

plainAddClient.accept("application/json")
 .type("application/json")
 .post({"email":"sample@gmail.com"})