500 Servlet Exception

java.lang.NullPointerException
	at _training._._index__jsp._jspService(/training//index.jsp:222)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:506)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.cmesn.struts.filter.CommonFilter.doFilter(CommonFilter.java:25)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.caucho.server.http.Invocation.service(Invocation.java:315)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:253)
	at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:170)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
	at java.lang.Thread.run(Thread.java:619)