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Since 7.4.9 request parameters are not properly propagated in jsp:included pages.

Reproducible with several nested jsp:include pages:

main.jsp

<jsp:include page="included.jsp?url_param1">
    <jsp:param name="jsp_param1" value="0" />
</jsp:include>

included.jsp

<jsp:include page="included_included.jsp?url_param2">
    <jsp:param name="jsp_param2" value="0" />
</jsp:include>

included_included.jsp

<jsp:include page="included_included_included.jsp?url_param3">
     <jsp:param name="jsp_param3" value="0" />
</jsp:include>

included_included_included.jsp

<%
   for (String p : java.util.Collections.list(request.getParameterNames())) {
     System.out.println(p);
   }
%>

Accessing main.jsp with

main.jsp?mainParam

Expected request parameters in innermost jsp (included_included_included.jsp):

mainParam
url_param1
jsp_param1
url_param2
jsp_param2
url_param3
jsp_param3

Actual parameters:

mainParam
url_param3
jsp_param3

clones

UNDERTOW-2285 Query parameters get lost in the included JSP page

is caused by

UNDERTOW-2206 IAE trying to decode a requestPath

is cloned by

JBEAP-25220 (8.0.z) UNDERTOW-2285 - Request parameters lost via jsp:include chain

is incorporated by

JBEAP-25032 (7.4.z) Upgrade Undertow from 2.2.25.SP3-redhat-00001 to 2.2.26.SP1-redhat-00001