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https://issues.apache.org/jira/browse/SLING-12760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17946757#comment-17946757
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Carsten Ziegeler commented on SLING-12760:
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yes, this is a known restriction. Hopefully, it will be fixed with SLING-12497
> Sling engine POST parameter parser is disrupted by osgi whiteboard filters
> using parameters.
> --------------------------------------------------------------------------------------------
>
> Key: SLING-12760
> URL: https://issues.apache.org/jira/browse/SLING-12760
> Project: Sling
> Issue Type: Bug
> Components: Engine
> Affects Versions: Engine 2.7.10
> Reporter: Dominik Smogór
> Priority: Minor
>
> An OSGI early servlet filter (org.osgi.service.http.whiteboard.Preprocessor
> service) can't use getParameter* family of request methods in POST requests.
> Otherwise the sling's own x-www-form-urlencoded parser fails and sling
> request methods report 0 parameters regardless of contents of the request.
> The most likely cause is the fact that request input stream is consumed by
> parameter parser of underlying servlet engine (tested with jetty on AEM 6.5)
> when called from the filter.
>
> here's a piece of code to demonstrate the problem:
> {code:java}
> @Component(service = Preprocessor.class,
> immediate = true,
> property = {
> HttpWhiteboardConstants.HTTP_WHITEBOARD_FILTER_PATTERN + "=/",
> HttpWhiteboardConstants.HTTP_WHITEBOARD_CONTEXT_SELECT +
> "=(osgi.http.whiteboard.context.name=*)"
> })
> public class FaultyFilter implements Preprocessor {
> @Override
> public void doFilter(ServletRequest servletRequest, ServletResponse
> servletResponse, FilterChain filterChain)
> throws IOException, ServletException {
> //calling this method in processor triggers the problem.
> String resource = request.getParameter("someParameter");
> filterChain.doFilter(servletRequest, servletResponse);
> }
> }
> {code}
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