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POjstl: how to know the variable? does it have some scope?
 

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    <p>I just want use jstl:core with SpringMVC.</p> <p>My controller contain something like :</p> <pre><code>private Map&lt;UUID, ProductBean&gt; products = new ConcurrentHashMap&lt;UUID, ProductBean&gt;(); </code></pre> <p>... ... ...</p> <pre><code>@RequestMapping(value="/createproduct/{pbid}", method=RequestMethod.GET) public String getProduct(HttpServletRequest req, Model model, @PathVariable("pbid") UUID pbid) { if(!products.containsKey(pbid)){ ProductBean tmp=new ProductBean(); products.put(pbid, tmp); //model.addAttribute("product",tmp); System.err.println("============empty now===============\n"); }else{ ProductBean tmp=products.get(pbid); System.err.println(pbid.toString()); System.err.println(tmp.getMpf().printFileNameList()); } req.getSession().setAttribute("pbId", pbid); model.addAttribute("pbId", pbid); return "production/createproduct"; } </code></pre> <p>I want simple using jstl like:</p> <pre><code> &lt;c:choose&gt; &lt;c:when test="${products.get(pbId).getMpf().size()==0}"&gt; &lt;p&gt;No pictures uploaded&lt;/p&gt; &lt;/c:when&gt; &lt;c:otherwise&gt; &lt;ul id="products"&gt; ...... &lt;/ul&gt; &lt;/c:otherwise&gt; &lt;/c:choose&gt; </code></pre> <p>But the program never go to the first branch </p> <p>I added &lt;%@ page import="java.util.*" language="java" %> package in my jsp, but it seems does not work. I follow the examples from <a href="http://www.springbyexample.org/examples/spring-web-flow-subflow-webapp-jsp-example.html" rel="nofollow">http://www.springbyexample.org/examples/spring-web-flow-subflow-webapp-jsp-example.html</a>. It seems they also have variable not declare in jsp like ${persons}. I want the products variable can work both controller and jsp view part. what I need to do? where I should declare it? Do I need to include other packetage in my jsp?</p>
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