I don't work for Lunarpages but here is a suggestion. The problem seems to me to be that you need to configure your logger to log into the real path of your application. Normally you want also logs hidden in the WEB-INF folder. You can find out real path to WEB-INF by executing the following JSP file in your public_html folder. Copy the file into the folder and then use the browser to access http://<yourdomain>/getRealPath.jsp.
The response should be something like:
The real path to your WEB-INF folder is /home/<domainlogin>/public_html/WEB-INF
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>getRealPath</title>
</head>
<body>
The real path to your WEB-INF folder is
<% out.println(application.getRealPath("/")+"WEB-INF"); %>
</body>
</html>
