The long line of code:
String
myFile=getServletConfig().getServletContext().getRealPath(myRequestFile);

is the same as:

ServletConfig servletConfig = getServletConfig();
ServletContext servletContext = servletConfig.getServletContext();
String myFile = servletContext .getRealPath(myRequestFile);

Its just all chained together.

The object first in the chain, pulls on the next in line which pulls the
next in line without having to explicitly giving a name for each step of
the way.

You can chain the methods and shorten your code.

After a point its gets less readable, from the programmer's point of view.

It all could also be shortened to:

String
pathToMyFile=getServletConfig().getServletContext().getRealPath(request.getServl\
etPath());

I was looking at the documentation and it appeared that
getServletConfig().getServletContext().
was redundant.