Feign QueryMap usage with POJO

Issue

I've found in FEIGN-README that I can do stuff like:

interface MarketDataRestClient {
    @RequestLine("GET /api/v1/depth")
    fun getOrderBook(@QueryMap orderBookQuery: OrderBookQuery) : OrderBook
}

OrderBookQuery:

data class OrderBookQuery(val symbol: String, val limit: Int? = 100)

And Feign should generate query params: /api/v1/depth?symbol={symbol}&limit={limit}

Unfortunately all I'm getting is:

Exception in thread "main" java.lang.IllegalStateException: QueryMap parameter must be a Map: class 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)

Solution

This feature will be available in 9.7. The current published version, as of the writing of this answer, is 9.6. If you do not want to wait, please clone the repository and run build the project.

Answered By - Kevin Davis