Jersey POST Rest服务无法接受包含HashMap的对象

@Provider
@Consumes(MediaType.APPLICATION_JSON)
public class HashMapReader implements MessageBodyReader<HashMap<String, Object>> {
    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type == HashMap.class;
    }

    @Override
    public HashMap<String, Object> readFrom(Class<HashMap<String, Object>> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException, WebApplicationException {
        // 在这里进行反序列化操作，将请求的数据转换为HashMap对象
        // 例如，使用JSON序列化方式可以使用Jackson库进行转换
        ObjectMapper mapper = new ObjectMapper();
        return mapper.readValue(entityStream, new TypeReference<HashMap<String, Object>>() {});
    }
}

@Provider
@Produces(MediaType.APPLICATION_JSON)
public class HashMapWriter implements MessageBodyWriter<HashMap<String, Object>> {
    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type == HashMap.class;
    }

    @Override
    public void writeTo(HashMap<String, Object> hashMap, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
        // 在这里进行序列化操作，将HashMap对象转换为响应数据
        // 例如，使用JSON序列化方式可以使用Jackson库进行转换
        ObjectMapper mapper = new ObjectMapper();
        mapper.writeValue(entityStream, hashMap);
    }
}

@ApplicationPath("/api")
public class MyApplication extends Application {
    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> classes = new HashSet<>();
        classes.add(HashMapReader.class);
        classes.add(HashMapWriter.class);
        return classes;
    }
}