JAXRS contract on API with @HeaderParam("Content-Type") and @Consumes with multiple values cause feign client build fail

Version : 11.0

API :

    @POST
    @Path("/{stream:.+}")
    @Consumes({"application/xlsx", "text/csv"})
    @Produces("application/json")
    List<Integer> sourceFile(
            @PathParam("stream") String stream,
            @QueryParam("delimiterChar") @DefaultValue(",") String delimiterChar,
            @HeaderParam("Content-Type") String contentType,
            @RequestBody(required = true, description = "Input file") InputStream file
    ) throws IOException;

Calling API with :

myCtrl.sourceFile("stream", null, "text/csv", inputStream);

Causes the error :

java.lang.NullPointerException: null
	at feign.okhttp.OkHttpClient.toOkHttpRequest(OkHttpClient.java:64) ~[feign-okhttp-11.0.jar:na]
	at feign.okhttp.OkHttpClient.execute(OkHttpClient.java:168) ~[feign-okhttp-11.0.jar:na]
	at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:119) ~[feign-core-11.0.jar:na]
	at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89) ~[feign-core-11.0.jar:na]
	at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100) ~[feign-core-11.0.jar:na]
	at com.sun.proxy.$Proxy143.sourceFile(Unknown Source) ~[na:na]

Because at OkHttpClient:62 (mediaType = MediaType.parse(value);), value variable equals "application/xlsx, text/csv" instead of "text/csv". Method MediaType.parse(value) returns null as "application/xlsx, text/csv" is not a valid media type.

[kdavisk6]

Learn something every day…

[velo]

Au contraire my good friend. Both support many values

The way encoders/decoders work on jax-rs allow they to handle multiple just fine.