kotlin enum with jooq

File.kt

data class Transaction(
    @JsonProperty
    var transactionId: Long,

    @JsonProperty
    var guid: String,

    @JsonProperty
    var accountId: Long,

    @JsonProperty
    var accountType: AccountType?,

    @JsonProperty
    var accountNameOwner: String,

    @JsonProperty
    var transactionDate: Date,

    @JsonProperty
    var description: String,

    @JsonProperty
    var category: String,

    @JsonProperty
    var amount: BigDecimal,

    @JsonProperty
    var transactionState: TransactionState?,

    @JsonProperty
    var activeStatus: Boolean = true,

    @JsonProperty
    var reoccurringType: ReoccurringType? = ReoccurringType.Undefined,

    @JsonProperty
    var notes: String = ""
) {

    constructor() : this(
        0L, "", 0, AccountType.Undefined, "", Date(0),
        "", "", BigDecimal(0.00), TransactionState.Undefined, true, ReoccurringType.Undefined, ""
    )

    @JsonGetter("transactionDate")
    fun jsonGetterTransactionDate(): String {
        val simpleDateFormat = SimpleDateFormat("yyyy-MM-dd")
        simpleDateFormat.isLenient = false
        return simpleDateFormat.format(this.transactionDate)
    }
    
    @JsonSetter("transactionDate")
    fun jsonSetterTransactionDate(stringDate: String) {
        val simpleDateFormat = SimpleDateFormat("yyyy-MM-dd")
        simpleDateFormat.isLenient = false
        this.transactionDate = Date(simpleDateFormat.parse(stringDate).time)
    }
    
    @JsonProperty
    var dueDate: Date? = null

    @JsonIgnore
    var receiptImageId: Long? = null

    @JsonIgnore
    var dateAdded: Timestamp = Timestamp(Calendar.getInstance().time.time)

    @JsonIgnore
    var dateUpdated: Timestamp = Timestamp(Calendar.getInstance().time.time)

    @JsonProperty
    var receiptImage: ReceiptImage? = null

    @JsonIgnore
    var account: Account? = null

    @JsonIgnore
    var categories = mutableListOf<Category>()

    override fun toString(): String {
        return mapper.writeValueAsString(this)
    }

    companion object {
        @JsonIgnore
        private val mapper = ObjectMapper()
    }
}

@JsonFormat
enum class AccountType(val label: String) {
    @JsonProperty("credit")
    Credit("credit"),

    @JsonProperty("debit")
    Debit("debit"),

    @JsonProperty("undefined")
    Undefined("undefined");
}

class TransactionRepository {
    suspend fun transactions(): List<Transaction> {
        return DatabaseFactory.doJooqQuery {
            it.selectFrom(Tables.T_TRANSACTION)
                .fetchInto(Transaction::class.java)
        }
    }
}

This is a case sensitive issue. If I set my enum credit instead of Credit it works.