Please help

Hi...I am new to GWT and i'm trying to develop a small
application...but here i need to open a directory and count the no.of
files in it.......I'm doing it as follows:

File dir = new File(file);
String[] pages = dir.list();
int count = pages.length;

I have imported java.io.File but the GWT compiler gives me the
following error.....plz help....

No source code is available for type java.io.File; did
you forget to inherit a required module?

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