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POSpring MVC Request Param
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  1. POSpring MVC Request Param
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    copied!<p>I have a login page with form action of <strong>j_security_check</strong>. As of now this form just have two fields namely username and password. I want to add a new dropdown to this form and collect the selected value in controller using <code>@RequestParam</code>. For some reason I am not able to pass this dropdown value from JSP to my controller as its throwing the <code>exception: MissingServletRequestParameterException</code> (Which occurs anytime a request param is missing).<br/> In the code below I added the Visuals dropdown. Do I need to use <code>Spring:Bind</code> tag here? Also on successful login, the control is directed to a controller with request mapping <strong>/controller1.html</strong> and this is where I am trying to collect the dropdown value.</p> <pre><code>&lt;form name="appLogin" action="j_security_check" method="POST"&gt; &lt;table width="100%"&gt; &lt;tr&gt; &lt;td align="center"&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;Username: &lt;/td&gt; &lt;td&gt;&lt;input id="userName" name="j_username" value=""/&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Password: &lt;/td&gt; &lt;td&gt;&lt;input name="j_password" type="password" value="" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Visual: &lt;/td&gt; &lt;td&gt;&lt;Select name="visuals" id="visuals"/&gt; &lt;option value="S1"&gt;S1&lt;/option&gt; &lt;option value="S2"&gt;S2&lt;/option&gt; &lt;option value="S3"&gt;S3&lt;/option&gt; &lt;option value="S4"&gt;S4&lt;/option&gt; &lt;/Select&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; &lt;button type="submit" name="submit" value="Sign In"&gt;Sign In&lt;/button&gt; &lt;input type="submit"/&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form&gt; </code></pre> <p>Controller Code: <br/></p> <pre><code> @RequestMapping( value = " /controller1.html", method = RequestMethod.GET ) public String setupForm( @RequestParam(value = "visuals", required=false) String visuals, ModelMap model ) { List&lt;String&gt; studentNames = new ArrayList&lt;String&gt;(); List&lt;String&gt; teacherNames = new ArrayList&lt;String&gt;(); model.addAttribute("someData", teacherNames); model.addAttribute("anotherData", studentNames); model.addAttribute("visuals", visuals); log.info("Role from Dropdown: " + visuals); return "school/classTen"; } </code></pre>
 

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