Class java.lang.ClassCastException

Question

Hello,
In a Collaboration Room we are using discussion Iviews with the LayoutSets Discussiongroups and DiscussiongroupsContributor. We are using SAP Portal NetWeaver2004 SP17.
By mistake we've made some changes in these LayoutSets and are getting the following stacktrace.
java.lang.ClassCastException
        at com.sapportals.wcm.rendering.component.cm.ResourcePath.doInitialize(ResourcePath.java:1228)
        at com.sapportals.wcm.rendering.component.cm.ResourcePath.render(ResourcePath.java:364)
        at com.sapportals.wcm.rendering.layout.cm.DiscussionGroupLayoutController.render(DiscussionGroupLayoutController.java:104)
        at com.sapportals.wcm.rendering.control.cm.WdfProxy.render(WdfProxy.java:1717)
        at com.sapportals.wdf.layout.HorizontalLayout.renderControls(HorizontalLayout.java:42)
        at com.sapportals.wdf.stack.Pane.render(Pane.java:155)
        at com.sapportals.wdf.stack.PaneStack.render(PaneStack.java:67)
        at com.sapportals.wdf.layout.HorizontalLayout.renderPanes(HorizontalLayout.java:73)
        at com.sapportals.wdf.stack.Pane.render(Pane.java:158)
        at com.sapportals.wdf.stack.PaneStack.render(PaneStack.java:67)
        at com.sapportals.wdf.layout.HorizontalLayout.renderPanes(HorizontalLayout.java:73)
        at com.sapportals.wdf.stack.Pane.render(Pane.java:158)
        at com.sapportals.wdf.stack.PaneStack.render(PaneStack.java:67)
        at com.sapportals.wdf.layout.HorizontalLayout.renderPanes(HorizontalLayout.java:73)
        at com.sapportals.wdf.stack.Pane.render(Pane.java:158)
        at com.sapportals.wdf.stack.PaneStack.render(PaneStack.java:67)
        at com.sapportals.wdf.WdfCompositeController.internalRender(WdfCompositeController.java:696)
        at com.sapportals.wdf.WdfCompositeController.build...
We still can create a Discussion Theme and we also can  create a discussion within the Discussion Theme.
But when we would like to respond to the discussion, we are getting an error.
Can someone help me with this problem?
Greetings,
Gene

Answer 1

Hi Detlev,
The error is still the same. I decompiled the ResourcePath.class. The strange thing is that there is no line 1228. The code ends with line 1095. Can it be the decompiler? (I decompiled with Cavaj).
The methode doInitialize() is on codelines 991-1010 and looks like this:
    private void doInitialize()
        throws WcmException
        ICustomizingController cc = CustomizingControllerFactory.getCustomizingController((ICollection)getResource(), (ICollection)getResource(), getProxy().getParameters(), getProxy());
        IParameterName names[] = getLayoutObject().getSupportedParameters();
        boolean isCollectionStyleSetOff = false;
        if(getLayoutObject().getParameters().isExactlyValue(ICollectionRendererParameterNameConst.COLLECTION_ACTIONSTYLE, "off"))
            isCollectionStyleSetOff = true;
        if(names != null)
            IParameters parameters = cc.parameters().getParameters(getFlavor(), names);
            getLayoutObject().setParameters(parameters);
        if(isCollectionStyleSetOff)
            getLayoutObject().setParameter(ICollectionRendererParameterNameConst.COLLECTION_ACTIONSTYLE, "off");
I expect that a classcastexception can occur in the first line... but why? What do you think?
Thanks,
Eric