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    <p>I know this is an old thread, but I thought I throw my hat in the ring and see if I can muddy the water a little bit more :)</p> <p>I found my initial struggle to understand <code>@ModelAttribute</code> was a result of Spring's decision to combine several annotations into one. It became clearer once I split it into several smaller annotations:</p> <p>For parameter annotations, think of <code>@ModelAttribute</code> as the equivalent of <code>@Autowired + @Qualifier</code> i.e. it tries to retrieve a bean with the given name from the Spring managed model. If the named bean is not found, instead of throwing an error or returning <code>null</code>, it implicitly takes on the role of <code>@Bean</code> i.e. Create a new instance using the default constructor and add the bean to the model.</p> <p>For method annotations, think of <code>@ModelAttribute</code> as the equivalent of <code>@Bean + @Before</code>, i.e. it puts the bean constructed by user's code in the model and it's always called before a request handling method.</p> <p>Figuratively, I see <code>@ModelAttribute</code> as the following (please don't take it literally!!):</p> <pre><code>@Bean("person") @Before public Person createPerson(){ return new Person(); } @RequestMapping(...) public xxx handlePersonRequest( (@Autowired @Qualifier("person") | @Bean("person")) Person person, xxx){ ... } </code></pre> <p>As you can see, Spring made the right decision to make <code>@ModelAttribute</code> an all-encompassing annotation; no one wants to see an annotation smorgasbord.</p>
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    1. POWhat is @ModelAttribute in Spring MVC?
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    1. USChristopher Yang
    1. USChristopher Yang
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    1. COHm, @Bean is singleton by default. I'm not sure the same concepts apply here.
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    2. COAbsolutely not. I'm just using simpler annotations to explain this complex annotation. Please take my explanation conceptually, not literally.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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