500 Internal Server Error

java.lang.NullPointerException
	at login.doGet(login.java:98)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:195)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:309)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
	at com.evermind[Oracle9iAS (1.0.2.2.1) Containers for J2EE].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:508)
	at com.evermind[Oracle9iAS (1.0.2.2.1) Containers for J2EE].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:177)
	at com.evermind[Oracle9iAS (1.0.2.2.1) Containers for J2EE].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:576)
	at com.evermind[Oracle9iAS (1.0.2.2.1) Containers for J2EE].server.http.HttpRequestHandler.run(HttpRequestHandler.java:189)
	at com.evermind[Oracle9iAS (1.0.2.2.1) Containers for J2EE].util.ThreadPoolThread.run(ThreadPoolThread.java:62)