HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception java.lang.IllegalStateException: Cannot forward after response has been committed de.fau.informatik.keks.servlets.student.LoginServlet.get(LoginServlet.java:54) de.fau.informatik.keks.servlets.AbstractServlet.doGet(AbstractServlet.java:48) javax.servlet.http.HttpServlet.service(HttpServlet.java:690) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) note The full stack trace of the root cause is available in the Apache Tomcat/5.5 logs. Apache Tomcat/5.5