HTTP Status 500 - type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exceptionjava.lang.NullPointerExceptionteacherclub.resource.servlet.workroom.FuJianServlet.doGet(FuJianServlet.java:37)javax.servlet.http.HttpServlet.service(HttpServlet.java:689)javax.servlet.http.HttpServlet.service(HttpServlet.java:802)teacherclub.util.allonymFilter.doFilter(allonymFilter.java:59)note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.Apache Tomcat/5.5.17
