[WICKET-6428] PageProvider#getPageInstance() may return null

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 8.0.0-M6
• Fix Version/s: 8.0.0-M7
• Component/s: wicket
• Assignee: Martin Tzvetanov Grigorov
• Reporter: Martin Tzvetanov Grigorov
• Created: 25/Jul/17 19:28
• Updated: 25/Jul/17 19:36
• Resolved: 25/Jul/17 19:36

Description

org.apache.wicket.core.request.handler.PageProvider#getPageInstance() may return null if there is no information about an expired page.

In this case error like the following may happen:

java.lang.NullPointerException
        at org.apache.wicket.core.request.handler.PageProvider.getPageClass(PageProvider.java:261)
        at org.apache.wicket.core.request.handler.RenderPageRequestHandler.getPageClass(RenderPageRequestHandler.java:163)
        at org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.mapHandler(AbstractBookmarkableMapper.java:400)
        at org.apache.wicket.core.request.mapper.MountedMapper.mapHandler(MountedMapper.java:159)
        at org.apache.wicket.request.mapper.CompoundRequestMapper.mapHandler(CompoundRequestMapper.java:210)
        at org.apache.wicket.request.cycle.RequestCycle.mapUrlFor(RequestCycle.java:449)
        at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:186)
        at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:202)
        at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:912)
        at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:65)
        at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:283)
        at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:253)
        at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:221)
        at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:262)
        at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:204)
        at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:286)