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https://issues.apache.org/jira/browse/WW-5423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17851624#comment-17851624
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Philip Crider commented on WW-5423:
-----------------------------------
That seems like a good change to me, and would definitely fix the problem.
> Query Parameters in Multipart Requests not working in v7 M6
> -----------------------------------------------------------
>
> Key: WW-5423
> URL: https://issues.apache.org/jira/browse/WW-5423
> Project: Struts 2
> Issue Type: Bug
> Affects Versions: 7.0.0
> Reporter: Philip Crider
> Priority: Major
> Fix For: 7.0.0
>
>
> One of the changes in [https://github.com/apache/struts/pull/861] broke query
> parameters in multipart requests. Their values are being lost.
> This is the old implementation, which returns null if the parameter doesn't
> exist.
> {code:java}
> public String[] getParameterValues(String name) {
> List<String> v = params.get(name);
> if (v != null && !v.isEmpty()) {
> return v.toArray(new String[0]);
> }
> return null;
> } {code}
>
> And this is the new implementation, which returns an empty array in that case.
> {code:java}
> public String[] getParameterValues(String name) {
> return parameters.getOrDefault(name, Collections.emptyList())
> .toArray(String[]::new);
> }{code}
>
> This method in MultiPartRequestWrapper is expecting null to be returned in
> that case.
> {code:java}
> public String[] getParameterValues(String name) {
> return ((multi == null) || (multi.getParameterValues(name) == null)) ?
> super.getParameterValues(name) : multi.getParameterValues(name);
> }{code}
>
>
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