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How i get value another class when i using #ManyToMany

I have 2 class. Requests and Services class.
Requests class.
import com.eziz.clients.Clients;
import com.eziz.services.Services;
import org.springframework.format.annotation.DateTimeFormat;
import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;
#Entity
#Table(name = "request")
public class Requests {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long requestId;
#Column(nullable = false, length = 80)
private String requestComment;
#Column(nullable = false, length = 15)
private String requestStatus;
#DateTimeFormat(pattern = "dd-MM-yyyy")
#Column(nullable = false)
private String requestExpiryTime;
#DateTimeFormat(pattern = "dd-MM-yyyy")
#Column(nullable = false)
private String requestDateCreated;
#ManyToOne
#JoinColumn(name = "requestClientId")
private Clients client;
#ManyToMany
#JoinColumn(name = "requestServiceId")
private Set<Services> service = new HashSet<>();
// #ManyToOne
// #JoinColumn(name = "requestService")
// private Services services;
//
public Long getRequestId() {
return requestId;
}
public void setRequestId(Long requestId) {
this.requestId = requestId;
}
public String getRequestComment() {
return requestComment;
}
public void setRequestComment(String requestComment) {
this.requestComment = requestComment;
}
public String getRequestStatus() {
return requestStatus;
}
public void setRequestStatus(String requestStatus) {
this.requestStatus = requestStatus;
}
public String getRequestExpiryTime() {
return requestExpiryTime;
}
public void setRequestExpiryTime(String requestExpiryTime) {
this.requestExpiryTime = requestExpiryTime;
}
public String getRequestDateCreated() {
return requestDateCreated;
}
public void setRequestDateCreated(String requestDateCreated) {
this.requestDateCreated = requestDateCreated;
}
public Clients getClient() {
return client;
}
public void setClient(Clients client) {
this.client = client;
}
public Set<Services> getService() {
return service;
}
public void setService(Set<Services> service) {
this.service = service;
}
}
Service Class.
package com.eziz.services;
import javax.persistence.*;
#Entity
#Table(name = "service")
public class Services {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long serviceId;
#Column(nullable = false, length = 20)
private String serviceName;
#Column(nullable = false, length = 30)
private String serviceCategory;
#Column(nullable = false)
private double servicePrice;
public Long getServiceId() {
return serviceId;
}
public void setServiceId(Long serviceId) {
this.serviceId = serviceId;
}
public String getServiceName() {
return serviceName;
}
public void setServiceName(String serviceName) {
this.serviceName = serviceName;
}
public String getServiceCategory() {
return serviceCategory;
}
public void setServiceCategory(String serviceCategory) {
this.serviceCategory = serviceCategory;
}
public double getServicePrice() {
return servicePrice;
}
public void setServicePrice(double servicePrice) {
this.servicePrice = servicePrice;
}
#Override
public String toString() {
return this.serviceName;
}
}
Now i get serviceName with ManyToMany in Service class.
But i can not get another value.i am need do this without toString.
<div class="modal header">
<h5 class="modal-title" id="modalTitle">Request Details</h5>
<button aria-label="Close" class="close" data-dismiss="modal"
type="button">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="content content-fixed content-auth">
<div class="container">
<h1 class="tx-color-01 mg-b-5" align="center">
SIFARIŞ MƏLUMATLARI </h1>
<hr>
<table class="table">
<tr th:object="${request}">
<tr>
<th scope="col">Sifariş ID</th>
<td scope="col" data-label="Sifariş ID" th:text="${request.requestId}"></td>
</tr>
<tr>
<th scope="col">Qeydiyyat tarixi</th>
<td data-label="Qeydiyyat tarixi" th:text="${request.requestDateCreated}"></td>
</tr>
<tr>
<th scope="col">Xidmət</th>
<td data-label="Xidmət" th:text="${request.service}"></td>
</tr>
<tr>
<th scope="col">Təhvil vermə zamanı</th>
<td data-label="Təhvil vermə zamanı" th:text="${request.requestExpiryTime}"></td>
</tr>
<tr>
<th scope="col">Rəy</th>
<td data-label="Rəy" th:text="${request.requestComment}"></td>
</tr>
<tr>
<th scope="col">Status</th>
<td data-label="Status" th:text="${request.requestStatus}"></td>
</tr>
</tr>
</table>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-danger" data-dismiss="modal">Bağla</button>
</div>
I dont can get value when i doing this.
<tr>
<th scope="col">Xidmət</th>
<td data-label="Xidmət" th:text="${request.service.serviceCategory}"></td>
</tr>
or
<tr>
<th scope="col">Xidmət</th>
<td data-label="Xidmət" th:text="${request.service.serviceCount}"></td>
</tr>
how i can do this? How i can get request.service.serviceCount or serviceCategory or serviceName
when i doing request.service this only coming serviceName, because i write here toString method return this.serviceName . i can get all of them with toString method. But i am need separately.

This is my Thymeleaf example
<p>
<span th:each="task : ${foo.tasks}">
<span th:text="${taskStat.index} + ': ' + ${task.name}"></span>
</span>
</p>
<tr th:each="book : ${listBooksTest}">
<td th:text="${book.id}">ID Book</td>
<td th:text="${book.id_author}">ID Author</td>
<td th:text="${book.title}">Title</td>
</td>
</tr>

#GetMapping("/requests/view/{requestId}")
public String requestDetails(#PathVariable(value = "requestId") long requestId, Model model) {
Requests request = requestService.getRequestById(requestId);
List<Clients> listClients = clientService.getAllClients();
List<Services> listServices = serviceRepository.findAll();
model.addAttribute("listServices", listServices);
model.addAttribute("listClients", listClients);
model.addAttribute("request", request);
return "request_detail_modal";
}
Yuxarıda list kimi gətirmişəm, onu burada td-ə gətirmək lazımdı.
<tr>
<th scope="col">Xidmət</th>
<td data-label="Xidmət" th:field="*{service}" th:text="{}"></td>
</tr>

org.springframework.dao.DataIntegrityViolationException:null constraint

I have this student class in model package in my model pacakage it has userid which refrences the userid in user class
#Entity
#Table(name = "student")
public class Student {
#Id
#Column(name = "Libraryid")
private int libraryid;
#Column(name = "Stdphone")
private String phoneno;
#Column(name = "stdmail")
private String studentmail;
#Column(name = "address")
private String address;
#Column(name = "academicsid")
private int academicid;
#Column(name = "user_userid", nullable = true)
private int userid;
#Column(name = "stdname")
private String studentname;
public String getStudentname() {
return studentname;
}
public void setStudentname(String studentname) {
this.studentname = studentname;
}
public int getLibraryid() {
return libraryid;
}
public void setLibraryid(int libraryid) {
this.libraryid = libraryid;
}
public String getPhoneno() {
return phoneno;
}
public void setPhoneno(String phoneno) {
this.phoneno = phoneno;
}
public String getStudentmail() {
return studentmail;
}
public void setStudentmail(String studentmail) {
this.studentmail = studentmail;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getAcademicid() {
return academicid;
}
public void setAcademicid(int academicid) {
this.academicid = academicid;
}
public int getUserid() {
return userid;
}
public void setUserid(int userid) {
this.userid = userid;
}
}
This is the jsp file for adding the student in the database but i have not put the userid because i want to enter when signup student for the system
<body>
<form:form method="post" modelAttribute="student" action="admin">
<table>
<tr>
<td><form:label path="libraryid">libraryid</form:label></td>
<td><form:input path="libraryid" /></td>
</tr>
<tr>
<td><form:label path="studentname">Name</form:label></td>
<td><form:input path="studentname" /></td>
</tr>
<tr>
<td><form:label path="phoneno">phoneno</form:label></td>
<td><form:input path="phoneno" /></td>
</tr>
<tr>
<td><form:label path="studentmail">studentmail</form:label></td>
<td><form:input path="studentmail" /></td>
</tr>
<tr>
<td><form:label path="academicid">academicid</form:label></td>
<td><form:input path="academicid" /></td>
</tr>
<tr>
<td><input type="submit" value="Save"></td>
</tr>
</table>
</form:form>
In the controller package in the admincontroller class i have this :
#RequestMapping(value = "/admin", method = RequestMethod.POST)
public String saveStudent(#ModelAttribute Student student) {
sDao.addStudent(student);
return "home";
}
And i have this error
message Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: Cannot add or update a child row: a foreign key constraint fails (`sunwaylib`.`student`, CONSTRAINT `fk_student_user` FOREIGN KEY (`user_userid`) REFERENCES `user` (`Userid`) ON DELETE SET NULL ON UPDATE CASCADE); SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`sunwaylib`.`student`, CONSTRAINT `fk_student_user` FOREIGN KEY (`user_userid`) REFERENCES `user` (`Userid`) ON DELETE SET NULL ON UPDATE CASCADE)
although I have set the database allow null valueenter image description here

Unable to set value in byte format to upload file to database

Employee Pojo Class:
#Entity
#Table(name = "Employee")
public class Employee implements Serializable {
private static final long serialVersionUID = -723583058586873479L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "empid")
private Integer empId;
#Column(name = "empname")
private String empName;
#Column(name = "empaddress")
private String empAddress;
#Column(name = "salary")
private Long salary;
#Column(name = "empAge")
private Integer empAge;
// .......................................................
#Column(name = "file_data")
private byte data;
public byte getData() {
return data;
}
public void setData(byte data) {
this.data = data;
}
// .......................................................
public Integer getEmpId() {
return empId;
}
public void setEmpId(Integer empId) {
this.empId = empId;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
public String getEmpAddress() {
return empAddress;
}
public void setEmpAddress(String empAddress) {
this.empAddress = empAddress;
}
public Long getSalary() {
return salary;
}
public void setSalary(Long salary) {
this.salary = salary;
}
public Integer getEmpAge() {
return empAge;
}
public void setEmpAge(Integer empAge) {
this.empAge = empAge;
}
}
This is my Jsp Page :
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Spring MVC Form Handling</title>
</head>
<body>
<h2>Add Employee Data</h2>
<form:form method="POST" action="/sdnext/save.html">
<table>
<tr>
<td><form:label path="id">Employee ID:</form:label></td>
<td><form:input path="id" value="${employee.id}" readonly="true"/></td>
</tr>
<tr>
<td><form:label path="name">Employee Name:</form:label></td>
<td><form:input path="name" value="${employee.name}"/></td>
</tr>
<tr>
<td><form:label path="age">Employee Age:</form:label></td>
<td><form:input path="age" value="${employee.age}"/></td>
</tr>
<tr>
<td><form:label path="salary">Employee Salary:</form:label></td>
<td><form:input path="salary" value="${employee.salary}"/></td>
</tr>
<tr>
<td><form:label path="address">Employee Address:</form:label></td>
<td><form:input path="address" value="${employee.address}"/></td>
</tr>
<tr>
<td><form:label path="data">Upload File:</form:label></td>
<td><form:input type="file" path="data" value="${employee.data}"/></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="Submit"/></td>
</tr>
</table>
</form:form>
<c:if test="${!empty employees}">
<h2>List Employees</h2>
<table align="left" border="1">
<tr>
<th>Employee ID</th>
<th>Employee Name</th>
<th>Employee Age</th>
<th>Employee Salary</th>
<th>Employee Address</th>
<th>Employee Pic</th>
<th>Actions on Row</th>
</tr>
<c:forEach items="${employees}" var="employee">
<tr>
<td><c:out value="${employee.id}"/></td>
<td><c:out value="${employee.name}"/></td>
<td><c:out value="${employee.age}"/></td>
<td><c:out value="${employee.salary}"/></td>
<td><c:out value="${employee.address}"/></td>
<td><c:out value="${employee.address}"/></td>
<td><c:out value="${employee.data}"/></td>
<td align="center">Edit | Delete</td>
</tr>
</c:forEach>
</table>
</c:if>
</body>
</html>
This is my Controller Class:
#Controller
public class EmployeeController {
#Autowired
private EmployeeService employeeService;
#RequestMapping(value = "/save", method = RequestMethod.POST)
public ModelAndView saveEmployee(
#ModelAttribute("command") EmployeeBean employeeBean,
BindingResult result) {
Employee employee = prepareModel(employeeBean);
employeeService.addEmployee(employee);
return new ModelAndView("redirect:/add.html");
}
#RequestMapping(value = "/employees", method = RequestMethod.GET)
public ModelAndView listEmployees() {
Map<String, Object> model = new HashMap<String, Object>();
model.put("employees",
prepareListofBean(employeeService.listEmployeess()));
return new ModelAndView("employeesList", model);
}
#RequestMapping(value = "/add", method = RequestMethod.GET)
public ModelAndView addEmployee(
#ModelAttribute("command") EmployeeBean employeeBean,
BindingResult result) {
Map<String, Object> model = new HashMap<String, Object>();
model.put("employees",
prepareListofBean(employeeService.listEmployeess()));
return new ModelAndView("addEmployee", model);
}
#RequestMapping(value = "/search", method = RequestMethod.GET)
public ModelAndView SearchEmployee(
#ModelAttribute("command") EmployeeBean employeeBean,
BindingResult result) {
Map<String, Object> model = new HashMap<String, Object>();
model.put("employee", prepareEmployeeBean(employeeService
.getEmployeebyName("Sunil Kumar")));
// model.put("employee", prepareEmployeeBean(employeeService
// .getEmployeebyName(employeeBean.getName())));
model.put("employees",
prepareListofBean(employeeService.GetRowEmployeess1()));
return new ModelAndView("SearchEmp", model);
}
#RequestMapping(value = "/index", method = RequestMethod.GET)
public ModelAndView welcome() {
return new ModelAndView("index");
}
#RequestMapping(value = "/delete", method = RequestMethod.GET)
public ModelAndView editEmployee(
#ModelAttribute("command") EmployeeBean employeeBean,
BindingResult result) {
employeeService.deleteEmployee(prepareModel(employeeBean));
Map<String, Object> model = new HashMap<String, Object>();
model.put("employee", null);
model.put("employees",
prepareListofBean(employeeService.listEmployeess()));
return new ModelAndView("addEmployee", model);
}
#RequestMapping(value = "/edit", method = RequestMethod.GET)
public ModelAndView deleteEmployee(
#ModelAttribute("command") EmployeeBean employeeBean,
BindingResult result) {
Map<String, Object> model = new HashMap<String, Object>();
model.put("employee", prepareEmployeeBean(employeeService
.getEmployee(employeeBean.getId())));
model.put("employees",
prepareListofBean(employeeService.listEmployeess()));
return new ModelAndView("addEmployee", model);
}
private Employee prepareModel(EmployeeBean employeeBean) {
Employee employee = new Employee();
employee.setEmpAddress(employeeBean.getAddress());
employee.setEmpAge(employeeBean.getAge());
employee.setEmpName(employeeBean.getName());
employee.setSalary(employeeBean.getSalary());
employee.setEmpId(employeeBean.getId());
employeeBean.setId(null);
return employee;
}
private List<EmployeeBean> prepareListofBean(List<Employee> employees) {
List<EmployeeBean> beans = null;
if (employees != null && !employees.isEmpty()) {
beans = new ArrayList<EmployeeBean>();
EmployeeBean bean = null;
for (Employee employee : employees) {
bean = new EmployeeBean();
bean.setName(employee.getEmpName());
bean.setId(employee.getEmpId());
bean.setAddress(employee.getEmpAddress());
bean.setSalary(employee.getSalary());
bean.setAge(employee.getEmpAge());
bean.setData(employee.getData());
beans.add(bean);
}
}
return beans;
}
public EmployeeBean getEmployeenamesa(Employee employee) {
EmployeeBean bean = new EmployeeBean();
bean.setName(employee.getEmpName());
bean.setId(employee.getEmpId());
bean.setAddress(employee.getEmpAddress());
bean.setSalary(employee.getSalary());
bean.setAge(employee.getEmpAge());
bean.setData(employee.getData());
return bean;
}
private EmployeeBean prepareEmployeeBean(Employee employee) {
EmployeeBean bean = new EmployeeBean();
bean.setAddress(employee.getEmpAddress());
bean.setAge(employee.getEmpAge());
bean.setName(employee.getEmpName());
bean.setSalary(employee.getSalary());
bean.setData(employee.getData());
bean.setId(employee.getEmpId());
return bean;
}
}
This is my Employee Bean class :
public class EmployeeBean {
private Integer id;
private String name;
private Integer age;
private Long salary;
private String address;
// ........................................................
private byte data;
public byte getData() {
return data;
}
public void setData(byte data) {
this.data = data;
}
// .......................................................
public Long getSalary() {
return salary;
}
public void setSalary(Long salary) {
this.salary = salary;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
I am trying to add image in Data Base i have field file_data why longblob but when i try to get file from my local machine and try to upload image then i am getting null Can not set byte field Employee.data to null value i don't know where am doing mistake while i have set all value if we remove data from file then i am able to save data and get data from database i am having Problem only with file part please suggest me where am doing wrong

You cannot have a byte for the File upload. You need to use the MultipartFile/byte[] for that.
Refer this link for more info .
Using Multipart : http://www.ioncannon.net/programming/975/spring-3-file-upload-example/
For JPA entity, you need to annotate with #Lob annotation

Spring form send null model object to database

I want to send data from form to PostgreSQL. When I send data by form, hibernate save (by save() method) blank record .. I did it manually (for test) without using form and then everything is ok.
Spitter.class (entity for user)
#Entity
#Table(name="spitter")
public class Spitter implements Serializable {
private static final long serialVersionUID = 829803238866007413L;
#Id
//#SequenceGenerator(name = "hibernate_sequence")
#GeneratedValue(strategy=GenerationType.AUTO) #Column(name="spitter_id")
private Long id;
#Column(unique=true) #Size(min=3, max=20) #Pattern(regexp = "^[a-zA-Z0-9]+$", message="Nie poprawna nazwa uzytkownika.")
private String username;
#Size(min=5, max=15, message="Haslo musi miec minimum 5 znakow.")
private String password;
#Size(min=3, max=25, message="Blad w imieniu i nazwisku.")
private String fullName;
#OneToMany(mappedBy="spitter")
private List<Spittle> spittles;
#Email(message="Nie poprawny adres email.")
private String email;
private boolean updateByEmail;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public List<Spittle> getSpittles() {
return spittles;
}
public void setSpittles(List<Spittle> spittles) {
this.spittles = spittles;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public void setUpdateByEmail(boolean updateByEmail) {
this.updateByEmail = updateByEmail;
}
public boolean isUpdateByEmail() {
return updateByEmail;
}
#Override
public boolean equals(Object obj) {
Spitter other = (Spitter) obj;
return other.fullName.equals(fullName) && other.username.equals(username) && other.password.equals(password);
}
#Override
public int hashCode() {
// TODO Auto-generated method stub
return super.hashCode();
}
}
SpitterController.class
createSpitterProfile - shows form (edit.jsp) and sends model object (spitter) to form
addSpitterFromForm - receives binding data from form and save it to database and redirects to simply user profile
showSpitterProfile - there is of course null model object exception
#Controller
#RequestMapping("/spitters")
public class SpitterController {
private final SpitterService spitterService;
#Inject //#Autowired
public SpitterController(SpitterService spitterService) {
this.spitterService = spitterService;
}
//...
#RequestMapping(method = RequestMethod.GET, params = "new")
public String createSpitterProfile(Model model) {
model.addAttribute("spitter", new Spitter());
return "spitters/edit";
}
#RequestMapping(method = RequestMethod.POST)
public String addSpitterFromForm(#Valid Spitter spitter, BindingResult bindingResult) {
if(bindingResult.hasErrors())
return "spitters/edit";
spitterService.saveSpitter(spitter);
return "redirect:/spitters/" + spitter.getUsername();
}
#RequestMapping(value="/{username}", method = RequestMethod.GET)
public String showSpitterProfile(#PathVariable String username, Model model) {
model.addAttribute(spitterService.getSpitter(username));
return "spitters/view";
}
edit.jsp (registration form for new user (Spitter))
<%# taglib prefix="sf" uri="http://www.springframework.org/tags/form"%>
<%# taglib prefix="s" uri="http://www.springframework.org/tags"%>
<div>
<h2>New account test</h2>
<sf:form method="POST" modelAttribute="spitter"
enctype="multipart/form-data">
<fieldset>
<table>
<tr>
<th><sf:label path="fullName">Full name:</sf:label></th>
<td><sf:input path="fullName" size="15" /><br/>
<sf:errors path="fullName" cssClass="error" />
</td>
</tr>
<tr>
<th><sf:label path="username">Username:</sf:label></th>
<td><sf:input path="username" size="15" maxlength="15" />
<small id="username_msg">No spaces, please.</small><br/>
<sf:errors path="username" cssClass="error" />
</td>
</tr>
<tr>
<th><sf:label path="password">Password:</sf:label></th>
<td><sf:password path="password" size="30"
showPassword="true"/>
<small>6 characters or more (be tricky!)</small><br/>
<sf:errors path="password" cssClass="error" />
</td>
</tr>
<tr>
<th><sf:label path="email">Email Address:</sf:label></th>
<td><sf:input path="email" size="30"/>
<small>In case you forget something</small><br/>
<sf:errors path="email" cssClass="error" />
</td>
</tr>
<tr>
<th></th>
<td>
<sf:checkbox path="updateByEmail"/>
<sf:label path="updateByEmail">Send me email updates!</sf:label>
</td>
</tr>
<tr>
<th></th>
<td>
<input name="commit" type="submit"
value="I accept. Create my account." />
</td>
</tr>
</table>
</fieldset>
</sf:form>
</div>
and blank saved record to Postgres..

Try adding #modelattribute in this method .It fill fetch the required model object.
#RequestMapping(method = RequestMethod.POST)
public String addSpitterFromForm(**#ModelAttribute("spitter")** #Valid Spitter spitter, BindingResult bindingResult) {
if(bindingResult.hasErrors())
return "spitters/edit";
spitterService.saveSpitter(spitter);
return "redirect:/spitters/" + spitter.getUsername();
}
and just to check if it is getting the values from form,syso some values like syso(spitter.getUserName) to check if values are coming.
ALso, I believe that you are making a constructor and passing service to it ,so there is no need of #Inject
#Inject //#Autowired///Why are you injecting it if it is a constructor?
public SpitterController(SpitterService spitterService) {
this.spitterService = spitterService;
}

You have enctype="multipart/form-data in your FORM,
Check that you have something like that in your App-servlet.xml:
<bean id="multipartResolver" class=
"org.springframework.web.multipart.commons.CommonsMultipartResolver"
p:maxUploadSize="500000" />

Add rows on table on button click using spring mvc and bind added rows to modelAttribute

I have a table for which I am passing list of student objects from my spring controller method, On page load 3 rows are populated. I want the user to be able to add more rows delete existing rows on button click. Can anyone tell me how to achieve this. See below my controller and jsp code. On clicking add I want to add 3 more rows selecting check box and clicking delete row should delete the row. i want the the added columns to be binded
I am very new to jQuery is this possible without jQuery. If not please tell me in detail how to achieve this using jQuery
Student Entity
#Entity
#Table(name="STUDENT_REGISTRATION")
public class Student {
private int studentId;
private String firstName;
private String lastName;
private Date dob;
private String sex;
private String status;
private Date doj;
private int deptId;
private String deptName;
private int batchId;
private String batchName;
private int roleId;
private String roleName;
private String regNo;
public Student(){
}
public Student(int studentId, String firstName, String lastName, Date dob,
String sex, String status, Date doj, int deptId,
String deptName, int batchId, String batchName, int roleId,
String roleName, String regNo) {
super();
this.studentId = studentId;
this.firstName = firstName;
this.lastName = lastName;
this.dob = dob;
this.sex = sex;
this.status = status;
this.doj = doj;
this.deptId = deptId;
this.deptName = deptName;
this.batchId = batchId;
this.batchName = batchName;
this.roleId = roleId;
this.roleName = roleName;
this.regNo = regNo;
}
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="STUDENT_ID")
public int getStudentId() {
return studentId;
}
public void setStudentId(int studentId) {
this.studentId = studentId;
}
#Column(name="STUDENT_FIRST_NAME")
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
#Column(name="STUDENT_LAST_NAME")
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
#Column(name="DOB")
public Date getDob() {
return dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
#Column(name="SEX")
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
#Column(name="STATUS")
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
#Column(name="DOJ")
public Date getDoj() {
return doj;
}
public void setDoj(Date doj) {
this.doj = doj;
}
#Column(name="DEPT_ID")
public int getDeptId() {
return deptId;
}
public void setDeptId(int deptId) {
this.deptId = deptId;
}
#Column(name="DEPT_NAME")
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
#Column(name="BATCH_ID")
public int getBatchId() {
return batchId;
}
public void setBatchId(int batchId) {
this.batchId = batchId;
}
#Column(name="BATCH_NAME")
public String getBatchName() {
return batchName;
}
public void setBatchName(String batchName) {
this.batchName = batchName;
}
#Column(name="ROLE_ID")
public int getRoleId() {
return roleId;
}
public void setRoleId(int roleId) {
this.roleId = roleId;
}
#Column(name="ROLE_NAME")
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
#Column(name="REG_NO")
public String getRegNo() {
return regNo;
}
public void setRegNo(String regNo) {
this.regNo = regNo;
}
}
Student DTO
public class StudentDTO {
private int studentId;
private String firstName;
private String lastName;
private Date dob;
private String sex;
private String status;
private Date doj;
private int deptId;
private String deptName;
private int batchId;
private String batchName;
private int roleId;
private String roleName;
boolean select;
private String regNo;
public StudentDTO(){
}
public StudentDTO(int studentId, String firstName, String lastName,
Date dob, String sex, String status, Date doj, int deptId,
String deptName, int batchId, String batchName, int roleId,
String roleName, boolean select, String regNo) {
super();
this.studentId = studentId;
this.firstName = firstName;
this.lastName = lastName;
this.dob = dob;
this.sex = sex;
this.status = status;
this.doj = doj;
this.deptId = deptId;
this.deptName = deptName;
this.batchId = batchId;
this.batchName = batchName;
this.roleId = roleId;
this.roleName = roleName;
this.select = select;
this.regNo = regNo;
}
public int getStudentId() {
return studentId;
}
public void setStudentId(int studentId) {
this.studentId = studentId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Date getDob() {
return dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public Date getDoj() {
return doj;
}
public void setDoj(Date doj) {
this.doj = doj;
}
public int getDeptId() {
return deptId;
}
public void setDeptId(int deptId) {
this.deptId = deptId;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
public int getBatchId() {
return batchId;
}
public void setBatchId(int batchId) {
this.batchId = batchId;
}
public String getBatchName() {
return batchName;
}
public void setBatchName(String batchName) {
this.batchName = batchName;
}
public int getRoleId() {
return roleId;
}
public void setRoleId(int roleId) {
this.roleId = roleId;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
public boolean isSelect() {
return select;
}
public void setSelect(boolean select) {
this.select = select;
}
public String getRegNo() {
return regNo;
}
public void setRegNo(String regNo) {
this.regNo = regNo;
}
}
Here I am adding 3 Student Objects
public List<StudentDTO> addStudentToList(){
List<StudentDTO> studentList = new ArrayList<StudentDTO>();
StudentDTO stud = new StudentDTO();
for(int i=0; i<3; i++){
studentList.add(stud);
}
return studentList;
}
Student Controller class
#RequestMapping(value="/addStudent", method=RequestMethod.GET)
public ModelAndView getStudentForm(ModelMap model)
{ List<StudentDTO> studentList = studentService.getStudentAttributesList();
//List<Integer> userIdForDropDown = userDAO.getAllUserIdForDropDown();
//model.addAttribute("userIdDropDown",userIdForDropDown);
List<String> deptList = configDAO.getDeptListForDropDown();
model.addAttribute("deptlist",deptList);
List<String> batchList = configDAO.getAllBatchForDropDrown();
model.addAttribute("batchList", batchList);
ModelAndView mav = new ModelAndView("add_student");
Student stu = new Student();
mav.getModelMap().put("add_student", stu);
StudentForm studentForm = new StudentForm();
studentForm.setStudentList(studentList);
model.addAttribute("studentForm",studentForm);
return mav;
}
#RequestMapping(value="/addStudent", method=RequestMethod.POST)
public String saveStudent(#ModelAttribute("add_student") StudentForm studenfForm, BindingResult result, SessionStatus status, ModelMap model) throws ParseException{
/*if(result.hasErrors()){
return "add_student";
}*/
List<StudentDTO> newList = (List<StudentDTO>) studenfForm.getStudentList();
List<Student> newList1 = new ArrayList<Student>();
for(StudentDTO stud:studenfForm.getStudentList()){
Student student = new Student();
student.setBatchId(stud.getBatchId());
student.setBatchName(stud.getBatchName());
student.setDeptId(stud.getDeptId());
student.setDeptName(stud.getDeptName());
SimpleDateFormat sdf = new SimpleDateFormat("DD/MM/YYYY");
Date dateWithoutTime = sdf.parse(sdf.format(new Date()));
student.setDob(stud.getDob());
student.setDoj(stud.getDoj());
student.setFirstName(stud.getFirstName());
student.setLastName(stud.getLastName());
student.setRegNo(stud.getRegNo());
student.setRoleId(stud.getRoleId());
student.setRoleName(stud.getRoleName());
student.setStatus(stud.getStatus());
student.setSex(stud.getSex());
student.setStudentId(stud.getStudentId());
newList1.add(student);
}
Integer saveStatus = studentDAO.saveStudentInfo(newList1);
//Integer res = roleDAO.saveRole(role);
if(saveStatus!=null){
status.setComplete();
model.addAttribute("savedMsg", "Student record saved Successfully.");
}
return "redirect:addStudent";
}
See my jsp page
<table bgcolor="white" width="1200" height="300" align="center" style="border-collapse: collapse;" border="1" bordercolor="#006699" >
<form:form action="addStudent" method="post" commandName="add_student" modelAttribute="studentForm">
<tr>
<td align="center" style="background-color: lightblue"><h3>Add Student</h3></td>
</tr>
<tr align="left">
<td align="left">
<input type="button" id="addrows" name="addrows" class="addperson" value="Add Rows">
<input type="button" id="removerows" class="removerows" value="Delete Rows" />
<input type="submit" value="Save" />
</td>
</tr>
<tr valign="middle" align="center">
<td align="center" valign="middle">
<table width="1200" height="200" style="border-collapse: collapse;" border="0" bordercolor="#006699" cellspacing="0" cellpadding="0">
<thead>
<tr height="1" bgcolor="lightblue">
<th colspan="1">
No
</th>
<th width="5">
Select
</th>
<th>
Reg No
</th>
<th>
First Name
</th>
<th>
Last Name
</th>
<th>
Sex
</th>
<th>
DOB
</th>
<th>
DOJ
</th>
<th>
Dept Name
</th>
<th>
Role Name
</th>
<th>
Batch Name
</th>
<th>
Status
</th>
</tr>
</thead>
<tbody>
<c:forEach var="rows" items="${studentForm.studentList}" varStatus="status">
<tr class="${status.index % 2 == 0 ? 'even' : 'odd'}" >
<td width="15">
<b>${status.count}</b>
</td>
<td width="10">
<form:checkbox path="studentList[${status.index}].select"/>
</td>
<td><form:input path="studentList[${status.index}].regNo"/></td>
<td><form:input path="studentList[${status.index}].firstName"/></td>
<td><form:input path="studentList[${status.index}].lastName"/></td>
<td><form:select path="studentList[${status.index}].sex">
<form:option value="NONE" label="--- Select ---"/>
<form:option value="M" label="Male"/>
<form:option value="F" label="Female"/>
</form:select></td>
<td><form:input path="studentList[${status.index}].dob"/></td>
<td><form:input path="studentList[${status.index}].doj"/></td>
<td><form:select path="studentList[${status.index}].deptName">
<form:option value="NONE" label="--- Select ---"/>
<form:options items="${deptlist}" />
</form:select></td>
<td><form:select path="studentList[${status.index}].roleName">
<form:option value="NONE" label="--- Select ---"/>
<form:option value="ROLE_STUDENT" label="Student"/>
<form:option value="ROLE_BATCHREP" label="Batch Rep"/>
</form:select></td>
<td><form:select path="studentList[${status.index}].batchName">
<form:option value="NONE" label="--- Select ---"/>
<form:options items="${batchList}" />
</form:select>
</td>
<td><form:select path="studentList[${status.index}].status">
<form:option value="NONE" label="--- Select ---"/>
<form:option value="E" label="Enable"/>
<form:option value="D" label="Disable"/>
</form:select></td>
</tr>
</c:forEach>
</tbody>
</table>
</td>
</tr>
<tr align="center">
<td width="100" align="center"><B>
${savedMsg}
</B>
</td>
</tr>
</form:form>
</table>

Even though this thread is older, For the benefit of others who is in need of this.
Let me explain with a minimal code and User example with firstName, email, userName and gender fields so that people won't get confused with bigger code.
Consider you are sending 3 empty users in usersList from controller this will creates 3 empty rows. If you inspect/view page source you will see
Rows(<input> tags) with different id's like list0.firstName
list1.firstName
Rows(<input> tags) with different names like list[0].firstName
list[1].firstName
Whenever form is submitted id's are not considered by server(added for only for helping client side validations), but name attribute will be interpreted as request parameter and are used to construct your modelAttribute, hence attribute names are very important while inserting rows.
Adding row
So, How to construct/append new rows?
If i submit 6 users from UI, controller should receive 6 user object from usersList. Steps to achieve the same is given below
1. Right click -> view page source. You will see rows like this(you can see *[0].* in first row and *[1].* in second row)
<tr>
<td><input id="list0.firstName" name="list[0].firstName" type="text" value=""/></td>
<td><input id="list0.email" name="list[0].email" type="text" value=""/></td>
<td><input id="list0.userName" name="list[0].userName" type="text" value=""/></td>
<td>
<span>
<input id="list0.gender1" name="list[0].gender" type="radio" value="MALE" checked="checked"/>Male
</span>
<span>
<input id="list0.gender2" name="list[0].gender" type="radio" value="FEMALE"/>Female
</span>
</td>
</tr>
<tr>
<td><input id="list1.firstName" name="list[1].firstName" type="text" value=""/></td>
<td><input id="list1.email" name="list[1].email" type="text" value=""/></td>
<td><input id="list1.userName" name="list[1].userName" type="text" value=""/></td>
<td>
<span>
<input id="list1.gender1" name="list[1].gender" type="radio" value="MALE" checked="checked"/>Male
</span>
<span>
<input id="list1.gender2" name="list[1].gender" type="radio" value="FEMALE"/>Female
</span>
</td>
</tr>
Copy first row and construct a javascript string and replace '0' with variable name index. As given in below sample
'<tr>'+
'<td><input id="list'+ index +'.firstName" name="list['+ index +'].firstName" type="text" value=""/></td>'+
'<td><input id="list'+ index +'.email" name="list['+ index +'].email" type="text" value=""/></td>'+
...
'</tr>';
Append the constructed row to the <tbody>. Rows get added in UI also on submission of form newly added rows will be received in controller.
Deleting row
Deleting row is little bit complicated, i will try to explain in easiest way
Suppose you added row0, row1, row2, row3, row4, row5
Deleted row2, row3. Do not just hide the row but remove it from the
DOM by catching event.
Now row0,row1,row4,row5 will get submitted but in the controller your
userList will have 6 user object but user[2].firstName will be null
and user[3].firstName will be null.
So in your controller iterate and check for null and remove the
user.(Use iterator don't use foreach to remove user object)
Posting code to benefit beginners.
// In Controller
#RequestMapping(value = "/app/admin/add-users", method = RequestMethod.GET)
public String addUsers(Model model, HttpServletRequest request)
{
List<DbUserDetails> usersList = new ArrayList<>();
ListWrapper userListWrapper = new ListWrapper();
userListWrapper.setList(usersList);
DbUserDetails user;
for(int i=0; i<3;i++)
{
user = new DbUserDetails();
user.setGender("MALE"); //Initialization of Radio button/ Checkboxes/ Dropdowns
usersList.add(user);
}
model.addAttribute("userListWrapper", userListWrapper);
model.addAttribute("roleList", roleList);
return "add-users";
}
#RequestMapping(value = "/app/admin/add-users", method = RequestMethod.POST)
public String saveUsers(#ModelAttribute("userListWrapper") ListWrapper userListWrapper, Model model, HttpServletRequest request)
{
List<DbUserDetails> usersList = userListWrapper.getList();
Iterator<DbUserDetails> itr = usersList.iterator();
while(itr.hasNext())
{
if(itr.next().getFirstName() == null)
{
itr.remove();
}
}
userListWrapper.getList().forEach(user -> {
System.out.println(user.getFirstName());
});
return "add-users";
}
//POJO
#Entity
#Table(name = "userdetails")
#XmlRootElement(name = "user")
public class DbUserDetails implements Serializable
{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String firstName;
private String userName;
private String email;
private String gender;
//setters and getters
}
//list wrapper
public class ListWrapper
{
private List<DbUserDetails> list;
//setters and getters
}
In JSP
<form:form method="post" action="${pageContext.request.contextPath}/app/admin/add-users" modelAttribute="userListWrapper">
<table class="table table-bordered">
<thead>
<tr>
<th><spring:message code="app.userform.firstname.label"/></th>
<th><spring:message code="app.userform.email.label"/></th>
<th><spring:message code="app.userform.username.label"/></th>
<th><spring:message code="app.userform.gender.label"/></th>
</tr>
</thead>
<tbody id="tbodyContainer">
<c:forEach items="${userListWrapper.list}" var="user" varStatus="loop">
<tr>
<td><form:input path="list[${loop.index}].firstName" /></td>
<td><form:input path="list[${loop.index}].email" /></td>
<td><form:input path="list[${loop.index}].userName" /></td>
<td>
<span>
<form:radiobutton path="list[${loop.index}].gender" value="MALE" /><spring:message code="app.userform.gender.male.label"/>
</span>
<span>
<form:radiobutton path="list[${loop.index}].gender" value="FEMALE" /><spring:message code="app.userform.gender.female.label"/>
</span>
</td>
</tr>
</c:forEach>
</tbody>
</table>
<div class="offset-11 col-md-1">
<button type="submit" class="btn btn-primary">SAVE ALL</button>
</div>
</form:form>
Javascript needs to be included in JSP
var currentIndex = 3; //equals to initialRow (Rows shown on page load)
function addRow()
{
var rowConstructed = constructRow(currentIndex++);
$("#tbodyContainer").append(rowConstructed);
}
function constructRow(index)
{
return '<tr>'+
'<td><input id="list'+ index +'.firstName" name="list['+ index +'].firstName" type="text" value=""/></td>'+
'<td><input id="list'+ index +'.email" name="list['+ index +'].email" type="text" value=""/></td>'+
'<td><input id="list'+ index +'.userName" name="list['+ index +'].userName" type="text" value=""/></td>'+
'<td>'+
'<span>'+
'<input id="list'+ index +'.gender1" name="list['+ index +'].gender" type="radio" value="MALE" checked="checked"/>Male'+
'</span>'+
'<span>'+
'<input id="list'+ index +'.gender'+ index +'" name="list['+ index +'].gender" type="radio" value="FEMALE"/>Female'+
'</span>'+
'</td>'+
'</tr>';
}