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Posted to dev@myfaces.apache.org by "Leonardo Uribe (JIRA)" <de...@myfaces.apache.org> on 2010/09/03 03:03:33 UTC
[jira] Reopened: (TOMAHAWK-1460) ClassCastException when testing
Tomahawk 1.1.9 table demos when preserveDataModel="true"
[ https://issues.apache.org/jira/browse/TOMAHAWK-1460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Leonardo Uribe reopened TOMAHAWK-1460:
--------------------------------------
I have to revert the patch, go back to stage 1, and try other alternatives
> ClassCastException when testing Tomahawk 1.1.9 table demos when preserveDataModel="true"
> ----------------------------------------------------------------------------------------
>
> Key: TOMAHAWK-1460
> URL: https://issues.apache.org/jira/browse/TOMAHAWK-1460
> Project: MyFaces Tomahawk
> Issue Type: Bug
> Components: Extended Datatable
> Affects Versions: 1.1.9
> Environment: Mac OS 10.5.8
> JDK 1.6.0
> Mojarra 2.0.0-SNAPSHOT
> Glassfish V3
> Reporter: Ryan Lubke
> Assignee: Leonardo Uribe
> Fix For: 1.1.10-SNAPSHOT
>
>
> When executing 'Paged and Sortable', 'Master-Detail', and 'Optional
> Header/Footer', a class cast exception is raised during post-back operations to
> update the view.
> java.lang.ClassCastException: javax.faces.model.ListDataModel cannot be cast to
> org.apache.myfaces.component.html.ext._SerializableDataModel
> at
> org.apache.myfaces.component.html.ext.AbstractHtmlDataTable.updateModelFromPreservedDataModel(AbstractHtmlDataTable.java:493)
> at
> org.apache.myfaces.component.html.ext.AbstractHtmlDataTable.processUpdates(AbstractHtmlDataTable.java:479)
> at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1108)
> at javax.faces.component.UIForm.processUpdates(UIForm.java:265)
> at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1108)
> at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1238)
> I've done some debugging here and have found this block of code being executed
> during processRestoreState():
> protected DataModel getDataModel()
> {
> if (_preservedDataModel != null)
> {
> setDataModel(_preservedDataModel);
> _preservedDataModel = null;
> }
> return super.getDataModel();
> }
> The call stack at this point in time is:
> at
> org.apache.myfaces.component.html.ext.AbstractHtmlDataTable.getDataModel(AbstractHtmlDataTable.java:839)
> at
> org.apache.myfaces.component.html.ext.HtmlDataTableHack.setRowIndex(HtmlDataTableHack.java:282)
> at
> org.apache.myfaces.component.html.ext.AbstractHtmlDataTable.setRowIndex(AbstractHtmlDataTable.java:276)
> at javax.faces.component.UIData.visitColumnsAndRows(UIData.java:1539)
> at javax.faces.component.UIData.visitTree(UIData.java:1207)
> at javax.faces.component.UIComponent.visitTree(UIComponent.java:1454)
> at javax.faces.component.UIComponent.visitTree(UIComponent.java:1454)
> at javax.faces.component.UIForm.visitTree(UIForm.java:333)
> at javax.faces.component.UIComponent.visitTree(UIComponent.java:1454)
> at javax.faces.component.UIViewRoot.processRestoreState(UIViewRoot.java:868)
> The interesting point here is that _preserveDataModel is set to null.
> Later, during processUpdates(), updateModelFromPreservedDataModel() will
> call getDataModel (as listed above), however, since _preservedDataModel was set
> to null, the call is delegated to the super class, UIData, which returns
> ListDataModel.
> This change in the code path is new spec required functionality where UIViewRoot.processRestoreState()
> uses the TreeVisitor to notify components of the PostRestoreStateEvent. Given this, I'm sure the
> problem will be manifest with MyFaces 2.0.0.
> WORKAROUND: set preservDataModel to false.
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