The server encountered an internal error that prevented it from fulfilling this request - in servlet 3 0

Question

I want to run easy registration jsp page with servlet  And it throw this error message   description The server encountered an internal error that prevented it from fulfilling this request   java lang NullPointerException     com java task11 utils ValidationUtils isEmailValid ValidationUtils java 22      com java task11 webapp RegistrationServlet validateInputs RegistrationServlet java 95      com java task11 webapp RegistrationServlet processRegistration RegistrationServlet java 66      com java task11 webapp RegistrationServlet doPost RegistrationServlet java 39      javax servlet http HttpServlet service HttpServlet java 646      javax servlet http HttpServlet service HttpServlet java 727      org apache tomcat websocket server WsFilter doFilter WsFilter java 52    Here is my registration jsp    lt    page contentType  text html charset UTF-8  language  java  pageEncoding  UTF-8    gt   lt    taglib prefix  c  uri  http   java sun com jsp jstl core    gt   lt    taglib prefix  fmt  uri  http   java sun com jsp jstl fmt    gt    lt c set var  language         value    not empty param language   param language   not empty language   language   pageContext request locale          scope  session   gt   lt fmt setLocale value    language    gt   lt fmt setBundle basename  com java task11 i18n text   gt    lt html lang    language   gt   lt head gt       lt title gt Registration lt  title gt       lt jsp include page  parts header jsp   gt   lt  head gt    lt body gt   lt div class  container-fluid registration  gt       lt div class  row  gt           lt div class  login-screen  gt               lt div class  login-part  gt                   lt div class  login-ico col-md-1 col-sm-2 col-xs-12 col-md-offset-3  gt                       lt h4 gt                           lt small gt  lt fmt message key  registration label   gt  lt  small gt                       lt  h4 gt                   lt  div gt                   lt div class  login-form col-md-4 col-sm-8 col-xs-12 col-md-offset-1 col-sm-offset-1  gt                       lt form action   registration  enctype  multipart form-data  method  post  gt                           lt  -- error messages --  gt                           lt div class  form-group  gt                               lt c forEach items    registrationErrors   var  error  gt                                   lt p class  error  gt   error  lt  p gt                               lt  c forEach gt                           lt  div gt                           lt  -- input fields --  gt                           lt div class  form-group  gt                               lt input class  form-control  placeholder   lt fmt message key  employee firstName   gt   name  first name  required                                    id  first-name   gt                               lt label class  login-field-icon fui-user  gt  lt  label gt                           lt  div gt                           lt div class  form-group  gt                               lt input class  form-control  placeholder   lt fmt message key  employee lastName   gt   name  last name  required                                    id  last-name   gt                               lt label class  login-field-icon fui-user  gt  lt  label gt                           lt  div gt                           lt div class  form-group  gt                               lt div class  input-group  gt                                   lt span class  input-group-btn  gt                                       lt span class  btn btn-primary btn-file  gt                                       lt fmt message key  button browse   gt                                       lt input type  file  name  userImage  accept  image     gt                                       lt  span gt                                   lt  span gt                                   lt input type  text  class  form-control  readonly    gt                               lt  div gt                           lt  div gt                           lt div class  form-group  gt                               lt input class  form-control  type  email  placeholder   lt fmt message key  login email   gt   name  email                                     pattern                       2    required id  email   gt                               lt label class  login-field-icon fui-mail  gt  lt  label gt                           lt  div gt                           lt div class  form-group  gt                               lt input class  form-control  type  password  placeholder   lt fmt message key  employee password   gt   name  password  required                                    id  password   gt                               lt label class  login-field-icon fui-lock  gt  lt  label gt                           lt  div gt                           lt div class  form-group  gt                               lt input class  form-control  type  text  placeholder   lt fmt message key  employee position   gt   name  position  required                                    id  position   gt                               lt label class  login-field-icon fui-plus  gt  lt  label gt                           lt  div gt                           lt div class  form-group  gt                               lt button class  btn btn-primary btn-lg btn-block  name  submit                                      type  submit  value  Submit  gt                                   lt fmt message key  button submit   gt                               lt  button gt                               lt a class  login-link  href   lt c url value   login   gt   gt  lt fmt message key  registration login   gt  lt  a gt                           lt  div gt                       lt  form gt                   lt  div gt               lt  div gt           lt  div gt       lt  div gt   lt  div gt   lt jsp include page  parts scripts jsp   gt   lt  body gt   lt  html gt    RegistrationServlet    WebServlet   registration   public class RegistrationServlet extends HttpServlet       private static Logger log   Logger getLogger RegistrationServlet class       private EmployeeService employeeService   new EmployeeService          Override     protected void doGet HttpServletRequest request  HttpServletResponse response            try               request getRequestDispatcher   pages registration jsp   forward request  response             catch  ServletException   IOException e                log error e                         Override     protected void doPost HttpServletRequest request  HttpServletResponse response            try               request setCharacterEncoding  UTF-8                processRegistration request  response             catch  ServletException   IOException e                log error e               e printStackTrace                         private void processRegistration HttpServletRequest request  HttpServletResponse response  throws IOException  ServletException           String firstName   request getParameter  first name            String lastName   request getParameter  last name            String email   request getParameter  email            String password   request getParameter  password            String imageName    default png           String position   request getParameter  position             System out printf  Request fields   s  s  s  s  s n   firstName  lastName  email  password  position            Part filePart   request getPart  userImage            try               String contentType   filePart getContentType                if  contentType startsWith  image                      File image   FileUploadUtils uploadFile this   img  employees   filePart                   imageName   FileUploadUtils getFilename image                           catch  Exception e                log error e                      List lt String gt  registrationErrors   validateInputs firstName  lastName  email  password  position            if  registrationErrors size    gt  0                request setAttribute  registrationErrors   registrationErrors               request getRequestDispatcher   pages registration jsp   forward request  response             else               Employee employee   new Employee                employee setFirstName firstName               employee setLastName lastName               employee setEmail email               employee setEncryptedPassword password               employee setImage imageName               employee setPosition position                employeeService save employee               response sendRedirect   login                          private List lt String gt  validateInputs String firstName  String lastName  String email  String password  String position            List lt String gt  registrationErrors   new ArrayList lt  gt              if  ValidationUtils isNullOrEmpty firstName                 registrationErrors add ValidationErrors FIRST NAME                     if  ValidationUtils isNullOrEmpty lastName                 registrationErrors add ValidationErrors LAST NAME                     if   ValidationUtils isEmailValid email                 registrationErrors add ValidationErrors EMAIL                     if  employeeService getByEmail email  getId      0                registrationErrors add ValidationErrors EMAIL ALREADY PRESENT                     if  ValidationUtils isNullOrEmpty password                 registrationErrors add ValidationErrors PASSWORD                     if   ValidationUtils isNullOrEmpty position                 registrationErrors add ValidationErrors POSITION EMPTY                     return registrationErrors            It couldn t extract from request parameters  From my easy checking it prints      Request fields  null null null null null   I couldn t figure out why this happen    Any suggestions

User · Answer

In here       if  ValidationUtils isNullOrEmpty lastName             registrationErrors add ValidationErrors LAST NAME             if   ValidationUtils isEmailValid email             registrationErrors add ValidationErrors EMAIL           you check for null or empty value on lastname  but in isEmailValid you don t check for empty value  Something like this should do      if  ValidationUtils isNullOrEmpty email      ValidationUtils isEmailValid email             registrationErrors add ValidationErrors EMAIL           or better yet  fix your ValidationUtils isEmailValid   to cope with null email values  It shouldn t crash  it should just return false

User · Answer

I found solution  It works fine when I throw away next line from form      enctype  multipart form-data    And now it pass all parameters at request ok     lt form action   registration  method  post  gt      lt  -- error messages --  gt      lt div class  form-group  gt       lt c forEach items    registrationErrors   var  error  gt       lt p class  error  gt   error  lt  p gt        lt  c forEach gt      lt  div gt

[java] The server encountered an internal error that prevented it from fulfilling this request - in servlet 3.0

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