java.lang.NullPointerException
	at Etude$Impl.render(Etude.java:494)
	at Etude.service(Etude.java:668)
	at sasta.ServletBase.service(ServletBase.java:103)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
	at org.apache.jserv.JServConnection.processRequest(JServConnection.java:317)
	at org.apache.jserv.JServConnection.run(JServConnection.java:188)
	at java.lang.Thread.run(Thread.java:534)