Validation with SpringBoot, Thymeleaf and Bootstrap

Question

I'm just start learning validation of users input value via modal window(bootstrap). And now I have a problem with controller/template, it doesn't work- even if I open /groups/getAll page, server drops with error:

 Failed to complete request: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#fields.hasErrors('name')" (template: "groups/getAll" - line 61, col 59)
20:32:50.056 [http-nio-8080-exec-1] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] -
                Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#fields.hasErrors('name')" (template: "groups/getAll" - line 61, col 59)] with root cause
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'group' available as request attribute

In console I see that constraint works well - @UniqueGroupName validator done as I want. How to fix controller and template to correct work?

Thanks in advance.

GroupDto

@UniqueGroupName
public class GroupDto {

    private int id;
    @NotBlank(message = "Name is mandatory")
    @Pattern(regexp = "[A-Z]{2}-[0-9]{3}", message = "Invalid Group name format, should be \"AA-201\"")
    private String name;
    @NotNull(message = "Select faculty")
    private int facultyId;
    private String facultyName;

GroupController

@Controller
@RequestMapping("/groups")
public class GroupController {

private static final String REDIRECT_PAGE = "redirect:/groups/getAll";

private final GroupService groupService;
private final ModelMapper modelMapper;
private final Logger logger = LoggerFactory.getLogger(GroupController.class);

@Autowired
public GroupController(GroupService groupService, ModelMapper modelMapper) {
    this.groupService = groupService;
    this.modelMapper = modelMapper;
}

@GetMapping("/getAll")
public String findAllGroups(Model model) {
    logger.debug("findAll() groupDtos");
    List groups = groupService.findAll().stream().map(g -> convertToDto(g)).collect(Collectors.toList());
    logger.trace("found {} groups.", groups.size());
    model.addAttribute("groups", groups);
    List faculties = groupService.getFaculties();
    model.addAttribute("faculties", faculties);
    return "groups/getAll";
}

@PostMapping("/add")
public String add(@Valid @ModelAttribute(value= "group") GroupDto groupDto, BindingResult bindingResult) {
    if (bindingResult.hasErrors()) {
        //what I need here to return modal window with errors information?
    } else {
        groupService.add(convertToEntity(groupDto));
        return REDIRECT_PAGE;
    }
}
 @GetMapping("/find")
    @ResponseBody
    public GroupDto find(int id) {
        return convertToDto(groupService.find(id));
    }

@PostMapping(value = "/update")
public String update(@Valid GroupDto groupDto) {
    groupService.update(convertToEntity(groupDto));
    return REDIRECT_PAGE;
}

@GetMapping("/delete")
public String deleteUser(int id) {
    groupService.delete(id);
    return REDIRECT_PAGE;
}

private GroupDto convertToDto(Group group) {
    return modelMapper.map(group, GroupDto.class);
}

private Group convertToEntity(GroupDto groupDto) {
    return modelMapper.map(groupDto, Group.class);
}
}

And finally template:







Groups


    
        List of groups
    


    
        
            Home
            Buildings
            Auditoriums
            Groups
            Faculties
        
    





    
        
            
                Group name
                Faculty Name
                Edit
                Delete
            
        
        
            
            
            Edit
            Delete
        
    



    
        
            
                
                    Add group
                    
                
                
                    
                        Group Name 
                        
                    
                    
                        Faculty 
                        
                    
                
                
                    
                    
                
            
        
    



    
        
            
                
                    Edit building
                    
                
                
                    
                        Group Id 
                    
                    
                        Group Name 
                    
                    
                        Faculty

Validation with SpringBoot, Thymeleaf and Bootstrap

0 Answers