Spring Boot MockMVC测试未使用自定义gson类型映射器进行反序列化

Question

I have the following type mapper:

public class LocaleTwoWaySerializer implements JsonSerializer<Locale>, JsonDeserializer<Locale> {
    @Override
    public JsonElement serialize(final Locale src, final Type typeOfSrc, final JsonSerializationContext context) {
        return src == null ? JsonNull.INSTANCE : new JsonPrimitive(src.getLanguage());
    }

    @Override
    public Locale deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context) throws JsonParseException {
        return json == null || JsonNull.INSTANCE.equals(json) ? null : new Locale(json.getAsString());
    }
}

My GsonConfig:

@Configuration
public class GsonConfig {

    private static Gson GSON = generateStaticBuilder().create();


    private static GsonBuilder generateStaticBuilder() {
        return new GsonBuilder()
                                    .registerTypeAdapter(Locale.class, new LocaleTwoWaySerializer())
                                    .enableComplexMapKeySerialization()
                                    .setPrettyPrinting()
    }


    @Bean
    public Gson getGsonInstance() {
        return GSON;
    }


}

My Web Config:

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

@Bean
    @ConditionalOnMissingBean
    @Autowired
    public GsonHttpMessageConverter gsonHttpMessageConverter(final Gson gson) {
        GsonHttpMessageConverter converter = new GsonHttpMessageConverter();
        converter.setGson(gson);
        return converter;
    }

}

My Test:

@SpringBootTest(webEnvironment = WebEnvironment.MOCK    )
@RunWith(SpringJUnit4ClassRunner.class)
@AutoConfigureMockMvc
public class MyTestClassIT {


    @Autowired
    private MockMvc mvc;

    @Autowired
    private Gson gson;

    @Test
    public void updateLocale() throws Exception {
        Locale locale = Locale.ITALIAN;
        mvc.perform(patch("/mypath").contentType(MediaType.APPLICATION_JSON)
                .content(gson.toJson(locale))).andExpect(status().isOk());
    }

}

The api i am testing has this signature:

@PatchMapping(path = "myPath")
    public ResponseEntity<Void> updateLocale(@RequestBody Locale preferredLocale)

I have placed breakpoints and can verify that my GsonHttpMessageConverter is being constructed, and serialization in my test using the autowired GSON instance directly works fine (using my typeAdapter) however I am getting a 400 bad request, As the type adapter is not used to deserialize.

What is missing please?

Answer 1

Are you sure you are not getting a 404 instead? I recreated your project here https://github.com/Flaw101/gsonconverter and verified it was working except with your setup it's a 404 because of capitalization in the path param which is not in the test.

  mvc.perform(patch("/mypath").contentType(MediaType.APPLICATION_JSON)
            .content(gson.toJson(locale))).andExpect(status().isOk());

should be

  mvc.perform(patch("/myPath").contentType(MediaType.APPLICATION_JSON)
            .content(gson.toJson(locale))).andExpect(status().isOk());