I am trying to add/update students but while updating student I am getting an error. But while adding student it works fine. I am getting this error while updating: -
HTTP Status 500 - Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
add-students.jsp
<form:form action="addStudent" enctype="multipart/form-data" modelAttribute="addstd" method="POST" >
<form:hidden path="id" />
${message}
<form:errors path="firstName" cssClass="error" />
<form:input path="firstName" placeholder="Fistname" />
<form:errors path="lastName" cssClass="error" />
<form:input path="lastName" placeholder="Lastname" />
<form:input path="contact_No" placeholder="Contact Number" />
<form:input path="address" placeholder="Address" />
<form:errors path="email" cssClass="error" />
<form:input path="email" placeholder="Email" />
<p class="msg">
Year:
<form:select path="year">
<c:forEach var="temp" items="${studentyear}">
<form:option value="${temp.yearId}">${temp.year}</form:option>
</c:forEach>
</form:select>
Faculty:
<form:select path="faculty">
<c:forEach var="temp" items="${studentfaculty}">
<form:option value="${temp.faculty_id}" >${temp.faculty}</form:option>
</c:forEach>
</form:select>
Profile: <input type="file" name="image" accept="image/*" />
</p>
<input type="submit" value="Add/Update Record" class="button" />
</form:form>
@Controller class
@RequestMapping(value="/addStudent",method=RequestMethod.POST)
public String saveStudent(@RequestParam("image") MultipartFile file,@RequestParam("id") int theId,@ModelAttribute("addstd") @Valid StudentInfo theStudent,BindingResult result,Model model){
String fileName=null;
if(!file.isEmpty()){
try {
String path= session.getServletContext().getRealPath("/resources/images");
String newName=String.valueOf(new java.util.Date().getTime());
fileName=file.getOriginalFilename();
String ext=FilenameUtils.getExtension(fileName);
if(ext.equalsIgnoreCase("jpg") || ext.equalsIgnoreCase("jpeg") || ext.equalsIgnoreCase("png")){
File imageFile=new File(path,newName+"."+ext);
file.transferTo(imageFile);
theStudent.setImages(newName+"."+ext);
if(theId!=0){
StudentInfo std=studentService.getStudent(theId);
String images= std.getImages();
File oldImage=new File(path,images);
Files.delete(oldImage.toPath());
}
}
} catch (Exception e) {
}
}
if(result.hasErrors()){
List <Year> theYear = studentService.getYear();
model.addAttribute("studentyear",theYear);
List<Faculty> theFaculty=studentService.getFaculty();
model.addAttribute("studentfaculty",theFaculty);
return "add-students";
}else{
studentService.saveStudent(theStudent);
return "redirect:/login";
}
}
@RequestMapping("/showFormForUpdate")
public String showUpdateStudent(@RequestParam("studentId") int theId, Model model){
StudentInfo theStudent=studentService.getStudent(theId);
model.addAttribute("addstd",theStudent);
List <Year> theYear = studentService.getYear();
model.addAttribute("studentyear",theYear);
List<Faculty> theFaculty=studentService.getFaculty();
model.addAttribute("studentfaculty",theFaculty);
return "add-students";
}
StudentDAOImpl.class
public void saveStudent(StudentInfo theStudent) {
Session currentSession=sessionFactory.getCurrentSession();
currentSession.saveOrUpdate(theStudent);
}
StudentInfo.class
@Entity
@Table (name="studentinfo")
public class StudentInfo implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="id")
private int id;
@Column(name="year_id")
private int year;
@Column(name="faculty_id")
private int faculty;
@NotEmpty(message="First Name cannot be empty")
@Column(name="firstname")
private String firstName;
@NotEmpty(message="Last Name cannot be empty")
@Column(name="lastname")
private String lastName;
@Column(name="contact_no")
private String contact_No;
@Column(name="address")
private String address;
@Email(message="Enter a valid email address")
@Column(name="email")
private String email;
@Column(name="images")
private String images;
@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name="ID")
private User user;
//getter and setter here
User.class
@Entity
@Table(name="user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="user_id")
private int user_id;
@Column(name="username")
private String username;
@Column(name="password")
private String password;
@OneToOne(mappedBy = "user",fetch = FetchType.LAZY)
private StudentInfo info;
//getter and setter here