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    <p>Still have the same User POJO</p> <pre><code>class User { private Integer id; private String name; public User() {} public Integer getId() { return id; } public String getName() { return name; } public void setName(String name) { this.name = name; } } @RequestMapping("/create/userCreate.do") public String createUser(Model model) { User user = new User(); model.addAttribute(user); return "userCreate"; } </code></pre> <p>Here I don't send the Id or any parameter, just pass the User form model attribute</p> <pre><code>@RequestMapping(value="/edit/userEdit.do", method=RequestMethod.POST) public String editFromForm(@ModelAttribute("user") @Valid User user, BindingResult bindingResult, Model model) { // If we have errors, don't save if(bindingResult.hasErrors()) { // Put what they did in the model and send it back model.addAttribute(user); return "users/edit"; } else { userDAO.saveOrUpdate(user); } // Show them the updated page on success return "redirect:/users/" + user.getId() + "/" + user.getName(); } </code></pre> <p>Here, the User object is bind user name and id. If there is no Id then the object will be saved and if the user object already is having Id then it will be updated. You don't have to pass id or parameter and make it visible on the address bar. Sometimes I don't like the idea of showing parameters to the users. I hope that helps</p> <pre><code>&lt;%@taglib uri="http://www.springframework.org/tags" prefix="spring"%&gt; &lt;%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%&gt; &lt;%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%&gt; &lt;head&gt; &lt;title&gt; User Edit &lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form:form method="post" action="userEdit.do" commandName="user"&gt; &lt;form:hidden path="id" /&gt; &lt;form:label path="username"&gt;User name:&lt;/form:label&gt; &lt;form:input path="username" type="text" maxlength="20" /&gt; &lt;form:errors path="username" /&gt; &lt;/form:form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. POWhat is the "correct" or "safe" way to update a persisted object with Spring MVC 3 + Hibernate?
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    1. COThis is mostly what I do as well. However, one side effect of this method is that since Spring creates a new object populated from the form, if you include the id as a hidden form field, you had better include EVERY property of the object in the form. Otherwise, when Spring creates a new instance (complete with your ID) it will "miss" populating some of the fields, which will cause your update to null them out! See this question: http://stackoverflow.com/questions/10705292/how-to-prepopulate-an-object-before-updating-using-spring-mvc-and-hibernate
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