Spring Data REST无法识别Cassandra Converter

Question

我在Spring Boot 2.1.0.RELEAS中使用spring-boot-starter-data-rest和spring-boot-starter-data-cassandra。

当我对具有复合主键的实体执行GET时，出现以下错误： org.springframework.core.convert.ConverterNotFoundException：未找到能够从[java.lang.String]类型转换为[com .... RankByYearAndNameKey]类型的转换器

下面是我的代码：

@PrimaryKeyClass
public class RankByYearAndNameKey implements Serializable {

    @PrimaryKeyColumn(name="race_year", ordinal = 0, type = PrimaryKeyType.PARTITIONED)
    private Integer raceYear;

    @PrimaryKeyColumn(name="race_name", ordinal = 1, type = PrimaryKeyType.PARTITIONED)
    private String raceName;

    @PrimaryKeyColumn(name="rank", ordinal = 2, type = PrimaryKeyType.CLUSTERED)
    private Integer rank;

    public Integer getRaceYear() {
        return raceYear;
    }
    ...
}


@Table("rank_by_year_and_name")
public class RankByYearAndName {    

    @PrimaryKey
    private RankByYearAndNameKey key;


    @Column("cyclist_name")
    private String cyclistName;

    public RankByYearAndNameKey getKey() {
        return key;
    }

    public void setKey(RankByYearAndNameKey key) {
        this.key = key;
    }

    public String getCyclistName() {
        return cyclistName;
    }

    public void setCyclistName(String cyclistName) {
        this.cyclistName = cyclistName;
    }
    ...
}

public class RankByYearAndNameKeyReadConverter implements Converter<String, RankByYearAndNameKey> {

  public RankByYearAndNameKey convert(String source) {

   if (StringUtils.hasText(source)) {
     try {
       return new ObjectMapper().readValue(source, RankByYearAndNameKey.class);
     } catch (IOException e) {
       throw new IllegalStateException(e);
     }
    }

    return null;
  }
}

public class RankByYearAndNameKeyWriteConverter implements Converter<RankByYearAndNameKey, String> {

    public String convert(RankByYearAndNameKey source) {

        try {
            return new ObjectMapper().writeValueAsString(source);
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }
    }
}

和配置文件：

@Configuration
@EnableCassandraRepositories(basePackages = { "com.demo.cassandradatarest.repo" })
public class ApplicationConfig extends AbstractClusterConfiguration
{
    .....
    @Bean
    public CassandraCustomConversions customConversions() {
        List<Converter<?, ?>> converters = new ArrayList<Converter<?, ?>>();
        converters.add(new RankByYearAndNameKeyReadConverter());
        converters.add(new RankByYearAndNameKeyWriteConverter());
        CassandraCustomConversions customConversions = new CassandraCustomConversions(converters);
        return customConversions;
    }

    @Bean
    public CassandraMappingContext mappingContext() throws ClassNotFoundException {
        CassandraMappingContext mappingContext = new CassandraMappingContext();
        mappingContext.setInitialEntitySet(getInitialEntitySet());

        CassandraCustomConversions customConversions = customConversions();
        mappingContext.setCustomConversions(customConversions);
        //mappingContext.setSimpleTypeHolder(customConversions.getSimpleTypeHolder());
        mappingContext.setUserTypeResolver(new SimpleUserTypeResolver(cluster().getObject(), getKeyspaceName()));
        return mappingContext;
    }

    @Bean
    public CassandraConverter converter() throws ClassNotFoundException {
        MappingCassandraConverter mappingCassandraConverter = new MappingCassandraConverter(mappingContext());
        mappingCassandraConverter.setCustomConversions(customConversions()); 
        return mappingCassandraConverter;
    }

    @Bean
    public CassandraSessionFactoryBean session() throws Exception {
        CassandraSessionFactoryBean session = new CassandraSessionFactoryBean();
        session.setCluster(cluster().getObject());
        session.setKeyspaceName(getKeyspaceName());
        session.setConverter(converter());
        session.setSchemaAction(SchemaAction.NONE);

        return session;
    }
    ....

}

当我执行 http://localhost:8181/rankByYearAndNames

{
    "_embedded": {
        "rankByYearAndNames": [
            {
                "cyclistName": "Daniel MARTIN",
                "_links": {
                    "self": {
                        "href": "http://localhost:8181/rankByYearAndNames/com.demo.cassandradatarest.entity.key.RankByYearAndNameKey@798fb380"
                    },
                    "rankByYearAndName": {
                        "href": "http://localhost:8181/rankByYearAndNames/com.demo.cassandradatarest.entity.key.RankByYearAndNameKey@798fb380"
                    }
                }
            },

当我在自我链接上执行GET时：“ http://localhost:8181/rankByYearAndNames/com.demo.cassandradatarest.entity.key.RankByYearAndNameKey@798fb380”

发生以下异常： org.springframework.core.convert.ConverterNotFoundException：未找到能够从[java.lang.String]类型转换为[com .... RankByYearAndNameKey]类型的转换器