Spring MVC - How do I update a model object's attributes using a controller method?

Question

Using Spring MVC 3.0, I am developing a member management system with basic CRUD operations and am having trouble with my Controller. I cannot update a member record using a Controller method. I have methods to display and process my 'Add Member' form and another to display my 'Edit Member' form and they all work fine. Here is my controller: ``` @Controller public class MemberController { private MemberService memberService; @Inject public MemberController(MemberService memberService) { this.memberService = memberService; } // Show member list @RequestMapping(value = "/members/list", method = RequestMethod.GET) public String showMemberList(Map<String, Object> model) { model.put("members", memberService.getAllMembers()); return "members/list"; } // Display add member form @RequestMapping(value = "/members/add", method = RequestMethod.GET) public String showAddMemberForm(Model model) { model.addAttribute(new Member()); return "members/add"; } // Process add member form @RequestMapping(v…

Accepted Answer

```
@RequestMapping(value = "/members/edit/{id}", method = RequestMethod.POST)
public String updateMember(@PathVariable int id, 
    HttpServletRequest request,@ModelAttribute("member") Member member) {
```

//Hope your MemberService looks similar

```
public void edit(Member member) {
logger.debug("Editing existing member");

// Retrieve session from Hibernate, if you are using hibernate
Session session = sessionFactory.getCurrentSession();

// Retrieve existing member via id
Member existingMember = (Member) session.get(Member.class, member.getId());

// Assign updated values to this member
existingMember.setForeName(member.getForeName());
existingMember.setSurName(member.getSurName());
...
...
existingMember.setPostcode(member.getPostcode());

// Save updates
session.save(existingMember);
```

}

Spring MVC - How do I update a model object's attributes using a controller method?

Solution

Problem