DropwizardAppRule throws: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.time.LocalDate out of START_ARRAY token

[Antti Pohjanpalo]

Hi!

I'm having problem with the following test class:

public class NotesApplicationTest {

    @ClassRule
    public static final DropwizardAppRule<NotesConfiguration> APP = new DropwizardAppRule<>(
            NotesApplication.class,
            ResourceHelpers.resourceFilePath("test-config.yml")
    );

    private final String BASE_URI = String.format("http://localhost:%d", APP.getLocalPort());

    @Test
    public void shouldGetNotes() {
        Response response = APP.client()
                .target(BASE_URI + "/notes/1")
                .request(MediaType.APPLICATION_JSON_TYPE)
                .get();

        assertThat(response.getStatus()).isEqualTo(200);
        NoteResponse note = response.readEntity(NoteResponse.class); // this line throws error
    }

}

The error I get is this:

Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.time.LocalDate out of START_ARRAY token
 at [Source: org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$UnCloseableInputStream@28b286c0; line: 1, column: 16] (through reference chain: anttipp.notes.rest.api.NoteResponse["date"])
 at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
 at com.fasterxml.jackson.databind.DeserializationContext.reportMappingException(DeserializationContext.java:1234)

The application itself works fine and testing with ResourceTestRule is also working fine. I'm using Dropwizard 1.1.4. How should I setup my test case to get it working? Could this be something similar than in https://github.com/dropwizard/dropwizard-java8/issues/8 ?

[Antti Pohjanpalo]

I managed to get it working by adding:

@Before
public void before() {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.registerModule(new JavaTimeModule());

    JacksonJsonProvider provider = new JacksonJsonProvider();
    provider.setMapper(objectMapper);

    APP.client().register(provider);
}

Not sure if I should open an issue for this or not.

[Antti Pohjanpalo]

I faced other deserialization problems. Instead of creating new ObjectMapper I overrided method io.dropwizard.testing.junit.DropwizardAppRule#clientBuilder and used io.dropwizard.testing.junit.DropwizardAppRule#getObjectMapper:

@ClassRule
public static final DropwizardAppRule<NotesConfiguration> APP = new DropwizardAppRule<NotesConfiguration>(
        NotesApplication.class,
        ResourceHelpers.resourceFilePath("test-config.yml")
) {
    @Override
    protected JerseyClientBuilder clientBuilder() {
        final JacksonJsonProvider jsonProvider = new JacksonJsonProvider();
        jsonProvider.setMapper(getObjectMapper());

        return new JerseyClientBuilder()
                .property(ClientProperties.CONNECT_TIMEOUT, 1000)
                .property(ClientProperties.READ_TIMEOUT, 5000)
                .register(jsonProvider);
    }
};