SpringDataJdbcConfig.kt

@EnableJdbcRepositories
@Configuration
open class SpringDataJdbcConfig : JdbcConfiguration() {

    @Bean
    open fun namedParameterJdbcTemplate(jdbcTemplate: JdbcTemplate): NamedParameterJdbcTemplate {
        return CustomizedNamedParameterJdbcTemplate(jdbcTemplate)
    }

    @Bean
    override fun jdbcCustomConversions(): JdbcCustomConversions {
        return JdbcCustomConversions(listOf(
                @ReadingConverter
                object : ConverterFactory<Int?, CodedEnum?> {
                    override fun <T : CodedEnum?> getConverter(targetType: Class<T>): Converter<Int?, T> {
                        return Converter { source: Int? -> targetType.enumConstants.find { it!!.code == source } }
                    }
                },
                @WritingConverter
                object : Converter<CodedEnum?, Int?> {
                    override fun convert(source: CodedEnum) = source.code
                },
                @WritingConverter
                object : Converter<CodedEnum?, String?> { // for default javaToDbType conversion
                    override fun convert(source: CodedEnum) = source.code.toString()
                }
                ))
    }
}