[WW-4904] Support for cross context request processing

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.3.34
• Fix Version/s: 6.5.0
• Component/s: Dispatch Filter

Environment

Wildlfy 10.1.0
Struts 2.3.34
JDK 1.8.0_151

• Assignee: Unassigned
• Reporter: Prasanth
• Created: 18/Dec/17 16:27
• Updated: 06/Apr/24 16:46

Description

When a request is forwarded from one context to another (both using struts2)

ServletContext sContext = context.getContext("/context2");
RequestDispatcher rd = sContext.getRequestDispatcher(resource);
rd.forward(request, response);

you get a ClassCastException. Both the projects has their own struts jars (in WEB-INF/lib folder).

Caused by: java.lang.ClassCastException: org.apache.struts2.dispatcher.mapper.ActionMapping cannot be cast to org.apache.struts2.dispatcher.mapper.ActionMapping
    at org.apache.struts2.dispatcher.ng.PrepareOperations.findActionMapping(PrepareOperations.java:163)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:92)
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:274)
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchToPath(ServletInitialHandler.java:209)
    at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImpl(RequestDispatcherImpl.java:221)
    ... 128 more

To make it work you have to have a filter (before struts2 filter) in the application that is receiving the request and have the below two lines.

request.setAttribute("struts.actionMapping", new ActionMapping());
request.setAttribute("struts.valueStack", null);