[Building Sakai] How do I get ServletContext? (Apache Wicket)

[Энхбат]

Hello,

I need to get ServletContext for file system path of deploy target.
If I call getServletContext like this:

<code>WicketApplication.get().getServletContext()</code>

[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] 
/sakai/wicketUpload/tool/src/java/pom/tool/pages/FirstPage.java:[56,65] 
error: cannot access ServletContext

Is sakai preventing to get servletContext? Can I get ServletContext or 
realPath/file system/ from sakai services?