what is the difference between those two @ModelAttribute usage?
public String getMethod(@ModelAttribute UserDetails userDetails){ ... } and
@ModelAttribute public UserDetails getAccount(@RequestParam String user, @RequestParam String emailId) 
Add a comment |
1 Answer
In both cases @ModelAttribute will add an attribute to your model (no surprise here). The difference is, that when used on a method, this method will be executed before the appropriate @RequestMapping method is called. You can use that if you want to add commonly attributes (The list for a drop down choice may be a proper example).
In contrast, when used as a parameter annotation, Spring tries to pass an already existing model attribute to your method. In case this doesn't exist, Spring will create a new attribute for you first.
Consult the documentation for details: http://docs.spring.io/spring/docs/4.1.7.RELEASE/spring-framework-reference/html/mvc.html#mvc-ann-modelattrib-methods
Hope that helps you.
