One new hint concerning the error messages. If I use the Tree class instead
of AbstractTree and set the linktype after constructing the tree, the
message doesn't appear any more but the tree component slows down extremely!

...
        tm = createTreeModel(animals);
            tree = new CdTree("tree", tm);
            tree.setRootLess(true);
*           tree.setLinkType(LinkType.REGULAR);*
        tree.getTreeState().collapseAll();
        testForm.add(tree.setOutputMarkupId(true));


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