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  1. Seam 2
  2. JBSEAM-4800

s:link does not work on failover in a clustered environment



      When clicking on an s:link after a node has been taken down, the exception below is thrown. The s:link will only work if the page is refreshed first so it is served by the new JBoss instance, but that negates transparent failover.

      Method of reproducing:

      • Two EAP 5.1 nodes fronted with mod_jk. No firewall, sticky sessions + session replication definitely enabled.
      • JBDS Seam generated ear + a simple @Clustered EJB3 which has a method that takes a parameter and prints the EL parametrized text (I don't think EL parametrization is relevant here)
      • Click on the s:link on the page, it invokes fine, go back in the browser. Shutdown the active JBoss instance. Click the s:link again which is redirected to the 2nd JBoss now and receive:

      14:17:42,995 ERROR [Exceptions] handled and logged exception
      java.lang.IllegalStateException: Unable to read view /home.xhtml to execute action "#

      {someComponent.printText('Hello World')}

      at org.jboss.seam.navigation.SafeActions.isActionSafe(SafeActions.java:67)
      at org.jboss.seam.navigation.Pages.callAction(Pages.java:699)
      at org.jboss.seam.navigation.Pages.preRender(Pages.java:331)
      at org.jboss.seam.jsf.SeamPhaseListener.preRenderPage(SeamPhaseListener.java:561)
      at org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPhaseListener.java:472)
      at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:148)
      at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:118)

      SafeActions.java:67 isn't so telling:
      String viewId = id.substring(0, loc);
      String action = "\"#

      {" + id.substring(loc+1) + "}


      InputStream is = FacesContext.getCurrentInstance().getExternalContext().getResourceAsStream(viewId);
      if (is==null) throw new IllegalStateException("Unable to read view " + "/" + viewId + " to execute action " + action);

      The code says the InputStream is null on failover, so the getResourceAsStream(viewId) failed to return anything.

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                • Assignee:
                  manaRH Marek Novotny
                  sjmenden Samuel Mendenhall
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                  • Created: