ServletBinding should initialize "parameters" binding lazilly

I tried GroovyServlet with Winstone servlet container. When i retrieved inputStream from the request, the Winstone server logged this error:
> Called getInputStream after getParameter ... error
After debugging, I discovered that ServletBinding in its constructor calls request.getParameterNames() to construct a map of all request parameters. This could be done lazilly just like "out" etc. is initialized.