Getting error while going to jsp page

This is my first post. I am working on a web application development. I am getting an error while redirecting to the jsp page

Type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /Register.jsp at line 55

52: List errormsgs = (List) request.getAttribute("errormsgs");
53: if(errormsgs !=null);
54: {
55: Iterator items = errormsgs.iterator();
56: while (items.hasNext()); {
57: String msg = (String) items.next();
58: %>

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handle JspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet .java:722)
org.netbeans.modules.web.monitor.server.MonitorFil ter.doFilter(MonitorFilter.java:393)
root cause

java.lang.NullPointerException
org.apache.jsp.Register_jsp._jspService(Register_j sp.java:117)
org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet .java:722)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet .java:722)
org.netbeans.modules.web.monitor.server.MonitorFil ter.doFilter(MonitorFilter.java:393)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.27 logs.

Cannot find what is wrong please help