Why does the statement doesn't execute in the jsp?

Question

This is a Spring Web MVC project where I do input validation in server side. If there are any errors, then I add it to the model before sending it to the view.

Controller

@Controller("resultController")
public class ResultController {

    private final ResultService resultService;

    @Autowired
    public ResultController(ResultService resultService) {
        this.resultService = resultService;
    }

    // @RequestMapping(value = "/search", method = RequestMethod.GET)
    @RequestMapping(value ="/template", method = RequestMethod.GET)
    public String getPersonList(ModelMap model) {
        System.out.println("We are coming into this place");
        return   "header";
    }


    @RequestMapping(value = "/number", method = RequestMethod.POST, params = { "regNo" })
    public String getStudentResult(@RequestParam(value = "regNo", required = true) String regNo, ModelMap model){

        //Server side validation
        if(regNo.equals(null) || regNo.isEmpty()){
            model.addAttribute("nullValue", "Register Number field cannot be empty");
            return "header";
        }else if(regNo.length() != 12 ){
            System.out.println("This Sys out is shown");
            model.addAttribute("invalidLength", new String("invalid"));

            return "header";
        }else{

            model.addAttribute("studentResult",resultService.getStudentResult(regNo));      
            return "numberResult";      
        }
    }   
}

header.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<head>
 <script src="http://code.jquery.com/jquery.min.js"></script>
     <style>
        #mycontainer, h1, h3 {
            text-align:center;
        }
        form {
            display:inline-block;
        }       
    /*  #regNoErrorMsgNumber {
            display: none;
            background: brown; 
            color: white;
        } */
    </style>

</head>
<body>

<div id="mycontainer">  
    <form method="post" action="number" id="number">
    <!--    <div id="regNoErrorMsgNumber">Only numbers are allowed</div> -->
            <div style="text-align: center;" >
                    <!-- //TODO: Only number, no spaces, no special symbol and 12 digit check-->                

                         <input  width="20" type="text" data-validation="numbers" id="regNo" name="regNo" size="30" maxLength="50" placeholder="Enter Register Number"> <b>OR</b>       
                        <div> 
                            <c:if test="${not empty nullValue}">
                                <c:out value="${nullValue}"/>
                            </c:if>


                            <c:if test="${not empty invalidLength}"> 
                                <c:out value="Register Number should be 12 digits"/>
                            </c:if>                      
                        </div>                  
            </div>      
    </form>           

    <form method="post" action="name" id="name"> 

                <input  type="text" id="studentName" name="studentName" size="30" maxLength="50" placeholder="Enter Student Name"></input>

    </form>                             
</div>             
            <div style="text-align: center;">
                <input id="inputFields" type="button" value="Search"  />
             </div>

    <!-- </form> -->
<script>    
    $(document).ready(function(){
        $('#inputFields').click(function(event){
            if (document.getElementById('regNo').value !=""){           

                $("#number").submit();

            }else if(document.getElementById('studentName').value !=""){
                $("#name").submit();
            }
        });
    });    
</script>

</body>

The following piece of jstl code in jsp doesn't work

<c:if test="${not empty invalidLength}"> 
    <c:out value="Register Number should be 12 digits"/>
</c:if>

Also if I use the c:out statement without c:if tag, then it works. But it misaligns two input fields in UI. You can see the div mycontainer code in jsp. I want the error message to be shown below the regNo input field, but at the same time regNo and studetnName input field should be center aligned in a single line.

PS: I get Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core". Try increasing the version of the Dynamic Web Module project facet, as this method of reference may not be supported by the current JSP version (1.1)., but c:out tag with being wrapped with c:if works.

@SotiriosDelimanolis Could you help me fixing this, Please. Thanks. — sofs1, Oct 08 '14 at 21:24

score 1 · Answer 1 · edited May 23 '17 at 12:30

1

please try the following :

if you are using maven , add this to your dependencies and maven will add the jar for you :
```
<dependencies>

          <dependency>
                 <groupId>jstl</groupId>
                 <artifactId>jstl</artifactId>
                 <version>1.2</version>
           </dependency>

</dependencies>
```
- if you are not using maven add the jstl library to your project (jstl-1.2.jar)
- make sure you set a Targeted Runtime for your project , Tomcat , Glassfish , etc ...

and please refer to this question here .

for the errors part , use the <form:errors> from spring form tags : - first add the following to your page :

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>

then use the form:errors like the following :

<form:errors path="userName" cssClass="error" element="div" />

please refer to the following tutorials , here and here .

Hope that helps

edited May 23 '17 at 12:30

Community

1
1

answered Oct 09 '14 at 05:55

Could you answer this question? Please. – sofs1 Oct 09 '14 at 07:02
i am answering this question !! , try to solve your problem , with the solutions i have provided to you. – Oct 09 '14 at 07:03
Thanks. I do tried using Spring form. But I need to create a new form class and validator. So I made use of modelAttribute itself. – sofs1 Oct 09 '14 at 07:13
Oh. Sorry. I missed the URL in my first comment http://stackoverflow.com/questions/26201424/why-do-i-get-two-different-project-context-for-my-spring-mvc-web-application?noredirect=1#comment41138381_26201424 Could you answer this question? Please. – sofs1 Oct 09 '14 at 07:14
accpet the answer if it solves your problem – Oct 09 '14 at 07:19
I can accept my own answer only after 2 days it seems. – sofs1 Oct 09 '14 at 07:26

score 0 · Answer 2 · answered Oct 09 '14 at 07:12

I created a new class called ProjectErrors and I changed the code as follows

if(regNo.equals(null) || regNo.isEmpty()){
        univErrors.setHasError(true);
        model.addAttribute("isNull", univErrors  );             
    }else if(Pattern.matches("[a-zA-Z]+", regNo)){
        univErrors.setHasError(true);
        model.addAttribute("onlyNumbers", univErrors  );    
    }else if(regNo.length() != 12 ){
        univErrors.setHasError(true);
        model.addAttribute("length", univErrors  );                 
    }

I changed the jsp like this

 <c:if test="${length.hasError}"> 
                        <c:out value="Register Number should be 12 digits."/>
                    </c:if>  

                    <c:if test="${onlyNumbers.hasError}">
                        <c:out value="Register number can contain only digits."/>
                    </c:if>

And my error class looks like this

public class ProjectErrors {

    public Boolean hasError;

    public ProjectErrors(boolean b) {
        // TODO Auto-generated constructor stub
        hasError = b;
    }

    public Boolean getHasError() {
        return hasError;
    }

    public void setHasError(Boolean hasError) {
        this.hasError = hasError;
    }


}

Now I see c:if tag working. But, still get the warning in jsp "Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core". Try increasing the version of the Dynamic Web Module project facet, as this method of reference may not be supported by the current JSP version (1.1).",

Why does the statement doesn't execute in the jsp?

2 Answers2