ViewScopeException after using an ADF DI workbook

Question

Hi,
I have a problem with my ADF application that is connected with an ADF DI workbook.
The steps to reproduce are the following
- Stop and then start the application in weblogic browser console
- Without accessing the application in the browser, open the integrated workbook and chose to connect. (If first you connect to the application from a browser and then from the integrated workbook, the error is not encountered)
- After the workbook is reinitialized, open the application in a browser. The following error is displayed in the browser window:
oracle.adf.share.exception.ViewScopeException: No technology supporting ViewScope found. Currently Faces and Trinidad support viewScope.
     at oracle.adf.share.ADFContext.getADFFacesViewScopeMap(ADFContext.java:498)
     at oracle.adf.share.ADFContext.getViewScope(ADFContext.java:405)
     at oracle.adf.controller.internal.binding.DCTaskFlowBinding.getActiveRegionMap(DCTaskFlowBinding.java:1314)
     at oracle.adf.controller.internal.binding.DCTaskFlowBinding.getActiveFlagFromViewScope(DCTaskFlowBinding.java:1332)
     at oracle.adf.controller.internal.binding.DCTaskFlowBinding.initialize(DCTaskFlowBinding.java:178)
     at oracle.adf.controller.internal.binding.DCTaskFlowBinding.isActive(DCTaskFlowBinding.java:1244)
     at oracle.adf.controller.internal.binding.TaskFlowRegionController.refreshRegion(TaskFlowRegionController.java:111)
     at oracle.adf.model.binding.DCBindingContainer.internalRefreshControl(DCBindingContainer.java:3194)
     at oracle.adf.model.binding.DCBindingContainer.refresh(DCBindingContainer.java:2871)
     at oracle.adf.controller.v2.lifecycle.PageLifecycleImpl.prepareModel(PageLifecycleImpl.java:112)
     at oracle.adf.controller.v2.lifecycle.Lifecycle$2.execute(Lifecycle.java:137)
     at oracle.adfinternal.controller.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:192)
     at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener.access$400(ADFPhaseListener.java:21)
     at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener$PhaseInvokerImpl.startPageLifecycle(ADFPhaseListener.java:231)
     at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener$1.after(ADFPhaseListener.java:267)
     at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener.afterPhase(ADFPhaseListener.java:71)
     at oracle.adfinternal.controller.faces.lifecycle.ADFLifecyclePhaseListener.afterPhase(ADFLifecyclePhaseListener.java:53)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:398)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:185)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:205)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:106)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:271)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:177)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
     at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
     at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
     at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
     at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
     at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
     at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:176)
I managed to reproduce this problem not only with my application, I also reproduced the error with MasterPriceList application (JDeveloper 11.1.1.4.0 and Excel 2007).
Edited by: Alex on Jun 23, 2011 6:01 AM

Answer 1

This unpleasant situation is generated by the flag SEARCHED_FACES_CONTEXT_CLASS set on true (on application scope map!) when DIRemoteServlet calls ADFContext.getCurrent().getViewScope() (called by method DCBindingContainer.processVariablesToken()).
The flag is set in the private method findFacesOrTrinidadContextClass() of ADFContext class (line 540). See ADF sources provided by JDeveloper 11g Release 1 PS 3 (11.1.1.4.0).
Excerpt from ADFContext.findFacesOrTrinidadContextClass():
520 contextClass = (Class)appScope.get(FACES_CONTEXT_CLASS);
521
522 if (contextClass == null && appScope.get(SEARCHED_FACES_CONTEXT_CLASS) == null)
523 {
524 try
525 {
532 }
538 finally
539 {
540 appScope.put(SEARCHED_FACES_CONTEXT_CLASS, true);
541 }
542 }
To avoid the ViewScopeException: "No technology supporting ViewScope found. Currently Faces and Trinidad support viewScope." you can use below code to reset the flag SEARCHED_FACES_CONTEXT_CLASS:
ADFContext adfContext = ADFContext.findCurrent();
try {
adfContext.getViewScope();
} catch (ViewScopeException e) {
Map<String, Object> appScope = adfContext.getApplicationScope();
if (appScope.get(SEARCHED_FACES_CONTEXT_CLASS) != null) {
// Remove locking flag from applicationScope to
// give a chance to Faces context initialization
appScope.remove(SEARCHED_FACES_CONTEXT_CLASS);
// Flag was removed, retry to initialize Faces context
adfContext.getViewScope();
I hope it'll be fixed in future releases.