swagger-ui not working with custom XML ObjectMapper

Question

I'm working on a spring boot app that should have swagger-ui enabled. When accessing http://localhost:8080/swagger-ui.html there is an error popup: "Unable to infer base url ..."

Additionaly, http://localhost:8080/v2/api-docs shows: error on line 1 at column 1: Document is empty The source-code of this page is a json, but it's requested as Content-Type application/xhtml+xml;charset=UTF-8

The cause of this seems to be my custom Jackson configuration:

@Configuration
public class JacksonConfig {

@Bean
public MappingJackson2XmlHttpMessageConverter mappingJackson2XmlHttpMessageConverter() {
    return new MappingJackson2XmlHttpMessageConverter(objectMapper());
}

@Bean
public ObjectMapper objectMapper() {
    JacksonXmlModule xmlModule = new JacksonXmlModule();
    xmlModule.setDefaultUseWrapper(false);
    XmlMapper objectMapper = new XmlMapper(xmlModule);
    objectMapper
            .registerModule(new ParameterNamesModule())
            .registerModule(new Jdk8Module())
            .registerModule(new JavaTimeModule());
    objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.UPPER_CAMEL_CASE);
    objectMapper
            .configure(MapperFeature.DEFAULT_VIEW_INCLUSION, false)
            .configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);

    return objectMapper;
}
}

With the following dependency:

<dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
    </dependency>

The problem is also described here: https://github.com/springfox/springfox/issues/1835

So my question is: How do I specify the priority of the jackson message converter to get swagger-ui working?

Answer 1

I just stumbled upon the solution while re-reading my own question.

Just add this to the above JacksonConfig class (don't know if ordering is important, but it works).

@Bean
public MappingJackson2HttpMessageConverter jsonConverter() {
    MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
    ObjectMapper objectMapper = new ObjectMapper();
    jsonConverter.setObjectMapper(objectMapper);
    return jsonConverter;
}