java - Bean Validation What's wrong? All the time result.hasErrors () == true -


all time result.haserrors () == true. what's wrong? if enter values in fields on page, restarts. necessary empty when entering rebooted, if enter fields moved page. validation class 

public class createcoursedto {     @notnull     private string name;     @notnull     private string category;     @notnull     private string description;     @notnull     private string links;        public createcoursedto() {}      public string getname() {         return name;     }      public void setname(string name) {         this.name = name;     }      public string getdescription() {         return description;     }      public void setdescription(string description) {         this.description = description;     }      public string getlinks() {         return links;     }      public void setlinks(string links) {         this.links = links;     }      public string getcategory() {         return category;     }      public void setcategory(string category) {         this.category = category;     } }

this controller:

@requestmapping(value = "/create", method = requestmethod.post, params = {         "titlefield", "descriptionfield", "linksfield", "categoryfield" }) public string createcoursepost(model model, httpsession session,         httpservletrequest request, @valid createcoursedto course3,         bindingresult result) {     model.addattribute("email", session.getattribute("email"));      string title = request.getparameter("titlefield");     string description = request.getparameter("descriptionfield");     string links = request.getparameter("linksfield");     string category = request.getparameter("categoryfield");  if (result.haserrors()) {             model.addattribute("email", session.getattribute("email"));         user user = userservice.read(session.getattribute("name")                 .tostring());         model.addattribute("listcategories", categoryservice.getall());         model.addattribute("abilitycreate", "true");          return "create";      } else {          model.addattribute("email", session.getattribute("email"));     course course = new course();     course.setname(title);     course.setdescription(description);     course.setlinks(links);     course.setcategory(category);     course.setstate("draft");     course.setowner(session.getattribute("email").tostring());     course = courseservice.create(course);     return "redirect:/courses";   }  }

page freemarker

<!doctype html> <html lang="en"> <head> <meta charset="utf-8"/> <link rel="stylesheet" type="text/css" href="./css/style.css"/> </head> <body> <div class="container">   <header>     <h1>       create course       <div class="logout">         <span id="currentuserlogin">           ${email}         </span>         <a href="logout.html">           <i class="icon-off"></i>         </a>       </div>     </h1>   </header>       <#if   abilitycreate=="false" >    <div class="alert alert-error">     <div>       <strong>okay, houston, we've had problem here.</strong>     </div>     <ul>       <li>action not allowed. again please.</li>     </ul>   </div>      <#elseif abilitycreate=="true">        <form class="form-horizontal" commandname="course3"  method=post>     <fieldset>       <div class="control-group">         <label class="control-label">name</label>         <div class="controls">           <input id="titlefield" name="titlefield" class="span5" type="text"/>          </div>       </div>        <div class="control-group">         <label class="control-label">category</label>         <div class="controls">           <select id="categoryfield" name="categoryfield" class="span5">             <option></option>              <#list listcategories category>              <option>${category.category}</option>              </#list>          </select>         </div>       </div>       <div class="control-group">         <label class="control-label">description</label>         <div class="controls">           <textarea id="descriptionfield" name="descriptionfield" class="span5" rows="3"></textarea>         </div>       </div>       <div class="control-group">         <label class="control-label">links</label>         <div class="controls">           <textarea id="linksfield" name="linksfield" class="span5" rows="3"></textarea>         </div>       </div>       <div class="form-actions">         <button id="createbutton" name="createbutton" class="btn btn-primary" type="submit">create</button>        </div>     </fieldset>     </form>    </#if>     <a class="btn" href="courses.html">cancel</a>   </div>   </body>   </html>


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