You need to bind your fact to a variable, so that you can call the getFileOld
method from a non static context. Also, I think you'd be better to use !=
rather than the 'not' keyword ('not' should be read 'doesn't exist' which
doesn't work if you want to bind a value). So your rule should be something
like:

rule "files not equal"

  when

        $file : FileData(fileOld != fileNew)

    then
       System.out.println("files are not equal");

       difference($file.getFileOld(),$file.getFileNew());

end



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