In development config the headers are validated after rendering:

org.apache.wicket.markup.html.WebPage.validateHeaders(WebPage.java:274)

Sven


On 11/25/2012 09:17 PM, Nick Pratt wrote:
Any thoughts on why Im seeing two invocations of the renderHead method?


On Wed, Nov 21, 2012 at 12:14 PM, Nick Pratt <nbpr...@gmail.com> wrote:

I've created a custom Behavior, and attached it to a DataTable.

I'm seeing two invocations per Page load of myBehavior.renderHeader
method, stacks below.
I've confirmed the following:
1. The containing Panel, and the DataTable are only added and constructed
once.
2. The hashcode of the Behavior is the same on both invocations
3. Ive only added the Behavior once, to the DataTable.

Are the following stacks expected correct processing for Wicket 6.3.0 ?



at com.DataTableBehavior.renderHead(DataTableBehavior.java:39)
  at org.apache.wicket.Component.renderHead(Component.java:2700)
at
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy$1.component(ChildFirstHeaderRenderStrategy.java:85)
  at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:96)
at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
  at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:51)
  at
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy.renderChildHeaders(ChildFirstHeaderRenderStrategy.java:78)
  at
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy.renderHeader(ChildFirstHeaderRenderStrategy.java:57)
  at
org.apache.wicket.markup.html.internal.HtmlHeaderContainer.onComponentTagBody(HtmlHeaderContainer.java:170)
at
org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
  at
org.apache.wicket.Component.internalRenderComponent(Component.java:2535)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1491)
  at org.apache.wicket.Component.internalRender(Component.java:2365)
at org.apache.wicket.Component.render(Component.java:2293)
  at
org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1388)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1553)
  at org.apache.wicket.Page.onRender(Page.java:884)
at org.apache.wicket.markup.html.WebPage.onRender(WebPage.java:142)
  at org.apache.wicket.Component.internalRender(Component.java:2365)
@@ at org.apache.wicket.Component.render(Component.java:2293)
  at org.apache.wicket.Page.renderPage(Page.java:1021)
at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:116)
  at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:244)
at
org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:165)
  at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:830)
at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
  at
org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:253)
at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:210)
  at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:281)
at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
  at
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:245)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
  at
org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:147)
  at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
  at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
  at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
  at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
  at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
  at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
  at
org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

----------

at com.DataTableBehavior.renderHead(DataTableBehavior.java:39)
  at org.apache.wicket.Component.renderHead(Component.java:2700)
at
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy$1.component(ChildFirstHeaderRenderStrategy.java:85)
  at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:96)
at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
  at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:87)
at
org.apache.wicket.markup.renderStrategy.DeepChildFirstVisitor.visit(DeepChildFirstVisitor.java:51)
  at
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy.renderChildHeaders(ChildFirstHeaderRenderStrategy.java:78)
  at
org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy.renderHeader(ChildFirstHeaderRenderStrategy.java:57)
  at
org.apache.wicket.markup.html.WebPage.validateHeaders(WebPage.java:274)
at org.apache.wicket.markup.html.WebPage.onAfterRender(WebPage.java:228)
  at org.apache.wicket.Component.afterRender(Component.java:891)
@@ at org.apache.wicket.Component.render(Component.java:2305)
  at org.apache.wicket.Page.renderPage(Page.java:1021)
at
org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:116)
  at
org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:244)
at
org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:165)
  at
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:830)
at
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
  at
org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:253)
at
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:210)
  at
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:281)
at
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
  at
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:245)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
  at
org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:147)
  at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
  at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
  at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
  at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
  at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
  at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
  at
org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)



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