void removeMissingJarSystems(XModelObject object) {
   XModelObject[] os = object.getChildren("FileSystemJar"); // $NON-NLS-1$
   for (int i = 0; i < os.length; i++) {
     JarSystemImpl jar = (JarSystemImpl) os[i];
     String location = jar.getLocation();
     if (location != null && !new File(location).isFile()) {
       jar.removeFromParent();
       object.setModified(true);
     }
   }
 }
 private XModelObject validateLib(XModelObject object) {
   XModelObject lib = object.getChildByPath("lib"); // $NON-NLS-1$
   if (lib == null) {
     XModelObject wi = object.getChildByPath("WEB-INF"); // $NON-NLS-1$
     if (wi == null) return null;
     XModelObject lb = wi.getChildByPath("lib"); // $NON-NLS-1$
     if (lb == null) return null;
     lib = wi.getModel().createModelObject(XModelObjectConstants.ENT_FILE_SYSTEM_FOLDER, null);
     lib.setAttributeValue(XModelObjectConstants.ATTR_NAME, "lib"); // $NON-NLS-1$
     lib.setAttributeValue(
         XModelObjectConstants.ATTR_NAME_LOCATION,
         wi.getAttributeValue(XModelObjectConstants.ATTR_NAME_LOCATION) + "/lib"); // $NON-NLS-1$
     object.addChild(lib);
     object.setModified(true);
   }
   return lib;
 }