I need to programmatically create a collection hierarchy. On the disk it creates
all the child directories in db. Also it doesnt give any error while creating. 
Any subsequent call to access the child collections fails, but parent collection
is accessible. 

I am using xidice embedded in servlet ...
here is code snippet 
---------------------------------

     Collection prjCol = createCollection(col, projectName);
     if( null == prjCol ){
           throw new Exception("");
     }
     Collection iformsCol = createCollection(prjCol, "forms");
     if( null ==  iformsCol){
           throw new Exception("");
                    }
     iformsCol.flushSymbolTable();
     iformsCol.close();
                                                                               
                                                              
     Collection dataCol = createCollection(prjCol, "data");
     if( null == dataCol ){
       throw new Exception();
      }
      dataCol.flushSymbolTable();
      dataCol.close();
                                                                               
                                                              
     Collection reportsCol = createCollection(prjCol, "reports");
     if( null == reportsCol ){
         throw new Exception("");
     }
     reportsCol.flushSymbolTable();
     reportsCol.close();
                                                                               
                                                              
     prjCol.flushSymbolTable();
     prjCol.close();
                                                                               
                                                              
     col.close();
----- create collection method ----------

public Collection createCollection(Collection parent, String name) throws
DBException{

        Document doc = new DocumentImpl();
                                                                               
                                                                      Element
colEle = doc.createElement("collection");
        colEle.setAttribute("compressed", "true");
        colEle.setAttribute("name", name);
        doc.appendChild(colEle);
                                                                               
                                                              
        Element filEle = doc.createElement("filer");
        filEle.setAttribute("class", "org.apache.xindice.core.filer.BTreeFiler");
        colEle.appendChild(filEle);
                                                                               
                                                              
        Configuration cfg = new Configuration ( doc, false );
        Collection newCol =     parent.createCollection(name , cfg);
                                                                               
                                                              
        return newCol ;
                                                                               
                                                                  }