@QueryMap not working with POJOs as specified in documentation

According to: https://github.com/OpenFeign/feign#dynamic-query-parameters it should be possible to write: @RequestLine("GET /api/v1/historicalTrades") fun getHistoricalTrades(@QueryMap orderBookQuery: OrderBookQuery): List<TradeEntry>

where OrderBookQuery looks like that: data class OrderBookQuery(val symbol: String, val limit: Int? = 100)

Feign should generate: /api/v1/historicalTrades?symbol={symobl}&limit={limit} but I’m getting:

Exception in thread "main" java.lang.IllegalStateException: QueryMap parameter must be a Map: class com.binance.api.feign.marketdata.model.OrderBookQuery
	at feign.Util.checkState(Util.java:128)
	at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:126)
	at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:64)
	at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:146)
	at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:53)
	at feign.Feign$Builder.target(Feign.java:198)
	at feign.Feign$Builder.target(Feign.java:194)

Here is my config and usage that produces above exception:

val marketDataRestClient =
        Feign.builder().encoder(GsonEncoder())
            .decoder(GsonDecoder())
            .logger(Logger.ErrorLogger())
            .logLevel(Logger.Level.FULL)
            .target(MarketDataRestClient::class.java, "https://api.binance.com")
    val s = marketDataRestClient.getHistoricalTrades(OrderBookQuery("ETHBTC"))

Link to my SO if someone wants to get them free karma points 😉 : https://stackoverflow.com/questions/50044283/feign-querymap-usage-with-pojo

[kdavisk6]

9.7 was released.

[3p5i10n]

While trying to reproduce it again in a separate sample project, i was not able to. Now 9.7 and 10.0.1 are working fine …have to check my base project again.

Sorry for the inconvenience and the late response, been busy the last weeks.