final public <T extends RootPersistentEntity>long putResource(String resPath,T obj,Serializer<T> serializer) throws IOException {
  return putResource(resPath,obj,System.currentTimeMillis(),serializer);
}

final public < T extends RootPersistentEntity > long putResource ( String resPath , T obj , Serializer < T > serializer ) throws IOException { return putResource ( resPath , obj , System . currentTimeMillis ( ) , serializer ) ; }
check & set , overwrite a resource
