Cast exception when invoke PageMetaFactory.GetTaxonomyKeywords

Question

I have a custom ServerControl to retrieve taxonomies information on context Page.

With the following code get the identifier of the page:

System.Collections.IList pageMetaList = pageMetaFactory.GetMetaByUrl(pageUrl);
if (pageMetaList.Count > 0)
  pageMeta = pageMetaList[0] as IPageMeta;

and after invoke the method GetTaxonomiesKeywords

CompositeFilter cf = new CompositeFilter();
Keyword[] selectedKeywords = _pmFactory.GetTaxonomyKeywords(pageUri, new Keyword[] { }, cf);

when Page is published on root folder, method GetTaxonomyKeywords return a runtime exception:

RuntimeException: com.tridion.storage.StructureGroup cannot be cast to com.tridion.storage.Keyword]
Codemesh.JuggerNET.NTypeValue.Throw(Int64 inst) +514
Codemesh.JuggerNET.JavaClass.ThrowTypedException(Int64 inst) +1243
Codemesh.JuggerNET.JavaMethod.CallObject(JavaProxy jpo, JavaMethodArguments args) +907
Com.Tridion.Meta.PageMetaFactory.GetTaxonomyKeywords(String taxonomyURI, String pageURI, KeywordArray arg2, TaxonomyFilter taxonomyFilter) +221
Tridion.ContentDelivery.Meta.PageMetaFactory.GetTaxonomyKeywords(String taxonomyUri, String pageUri, Keyword[] contextKeyword, TaxonomyFilter taxonomyFilter) +80
Tridion.ContentDelivery.Meta.PageMetaFactory.GetTaxonomyKeywords(String pageUri, Keyword[] contextKeyword, TaxonomyFilter taxonomyFilter) +22

otherwise if the Page is published in a subfolder, no exception is returned and method retrieves taxonomies info.

What could be the problem?

Answer 1

Does the URL contain a page name and an extension? If the URL does not it will assume it is a StructureGroup. Make sure, when your URL ends with a trailing slash, you add your default page (index.html).