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https://issues.apache.org/jira/browse/CXF-2986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909005#action_12909005
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Sergey Beryozkin commented on CXF-2986:
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Hi,
I'm tempted to close this JIRA as 'won't fix'.
There's some ambiguity there with respect to handling query parameters, but the
thing is that a query like
if we have for example
@QueryParam("option") String option
then given a query like
?option
we should an empty String, as the value of the 'option' parameter.
'Null' means the query was not there while an empty value means there was a
query parameter but without the usual name=value.
?option may not be the best example, but if we have something like
?_wadl
and get a null then it means there was no _wadl query...
Does it make sense or do you disagree ? We may need to ask a question in the
jaxrs users list. I definitely did get an answer regarding an emty value
representing a query where only a key is available.
thanks, Sergey
> sets null instead of empty List/Set/SortedSet when value isn't in query string
> ------------------------------------------------------------------------------
>
> Key: CXF-2986
> URL: https://issues.apache.org/jira/browse/CXF-2986
> Project: CXF
> Issue Type: Bug
> Components: JAX-RS
> Affects Versions: 2.2.10
> Reporter: Brad Cupit
> Priority: Minor
>
> CXF sets a null collection, rather than an empty one, when the query param
> isn't in the request
> Example:
> @GET
> @Path("/stuff")
> public Response get(@QueryParam("option") Set<String> options) { ... }
> and http://localhost:8080/stuff is called (but ?option=abc is not on the
> query string), then options will be null, but it should be an empty Set
> The javadocs in @DefaultValue says:
> If this annotation is not used and the corresponding metadata is not present
> in the request, the value will be an empty collection for List, Set or
> SortedSet
> this seems similar to CXF-1675
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