Thanks for this query, let me redirect to the CXF users list.

FYI, CXF JAX-RS runtime prepares a List itself and only expects ParamConverters if any to convert individual values.

I believe RI (Jersey) will also act the same way - but I may be wrong now. You can check a "ParamConverter and Collections" thread on the jaxrs users list. My understanding there was no any agreement reached.

Cheers, Sergey

On 16/10/16 23:48, Diego Ruotolo wrote:
Hi everybody,

this is my first post to this mailing list.
I am using Apache CXF and I have the following problem: I need to read a
multiple-value query parameter that is written in a
comma-separated-values (CSV) format, hence non standard HTTP way.
I know that this will be fixed in versions 3.1.8 and 3.2.0 with the
contextual property "parse.query.value.as.collection", as written here:
but the above solution works for ALL query parameters, I want to be
selective, for instance I just want query parameters annotated with
@MyAnnotation to be parsed as CSV collection, other query parameters may
accept commas as a value.
Therefore I've written a ParamConverter provided by a
ParamConverterProvider: the latter reads the annotation and returns the
appriopriate ParamConverter that converts a String into a List. But this
is not working since the returned List is used as first element of the
linked method parameter, so in the end I have a List of List.


Query parameter: MY_PARAM=VALUE_1,VALUE_2,VALUE_3
Method parameter: List<?> myParam; // Here I put "?" instead of "String"
as generic type in order to explain this example
ParamConverter fromString() method: return
Arrays.asList(value.split(",")); //returns a List<String>
Expected result: myParam is a List<String>, a list of 3 elements
Actual result: myParam is a List<List<String>>, a list with one element,
this single element is a list of 3 elements (VALUE_1, VALUE_2, VALUE_3)

It seems that when used in conjuction with a List (a Collection?) method
parameter, a ParamConverter works per-element, not for the whole list.
Is this the correct behaviour? Do you know some work-around that I could
use without writing an Apache CXF Interceptor (I don't want to be bound
to an implementation of JAX-RS) ?
I've noticed that Jersey has a similar issue too:

Thanks in advice,

best regards

Sergey Beryozkin

Talend Community Coders

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