Develop Reference

Why isn't my List<Object> displaying on my webpage?

I'm trying to display the contents of a List<> of objects that are linked to the currently logged in user on a jsp page. The object is successfully created and stored in the database with a user_id of the user who created it, and with a simple system.out.print debugger I can see its added to the List.
But when I try to display this on the NewFile.jsp webpage its as if the the List is empty. There is no error, instead the page is just blank as if there is no List to iterate through.
Skill method in UserController
#RequestMapping(value = "/skill", method = RequestMethod.POST)
public String skill(#ModelAttribute("skillForm") Skill skillForm, BindingResult bindingResult, Model model, Principal principal) {
skillValidator.validate(skillForm, bindingResult);
if (bindingResult.hasErrors()) {
return "skill";
}
// Adds skill object to database and adding it to Users skill list
String name = principal.getName();
skillService.save(skillForm, name);
User currentUser = userService.findByUsername(principal.getName());
currentUser.addSkill(skillForm);
// Debug here shows that the list contains correct data and the list size
System.out.println(skillForm.getSkillName());
System.out.println(skillForm.getCategory());
System.out.println(currentUser.getSkills().size());
// Attempting to pass the list to NewFile.jsp to be displayed
List<Skill> savedSkills = currentUser.getSkills();
for(int i = 0; i < savedSkills.size(); i++) {
model.addAttribute("skills", savedSkills);
/*model.addAttribute("currentUser", currentUser);*/
}
return "NewFile";
}
NewFile.jsp
<table>
<c:forEach var="o" items="${savedSkills}" >
<tr>
<td>Skill Name:<c:out value = "${o.skillName}"/></td>
<td>Category:<c:out value = "${o.category}"/> </td>
</tr>
</c:forEach>
</table>

There are some mistakes. First you don't need a loop.
List<Skill> savedSkills = currentUser.getSkills();
model.addAttribute("skills", savedSkills);
Second, your EL has the wrong argument name, just like the others had stated.
<c:forEach var="o" items="${skills}" >

You need to specify what skill to be added , you are adding the List as an attribute but you need to the object that's inside it
for(int i = 0; i < savedSkills.size(); i++) {
model.addAttribute("skills", savedSkills[i]);
/*model.addAttribute("currentUser", currentUser);*/
}

Try by adding the code model.addAttribute("savedSkills", savedSkills); before the return statement. You haven't add the model attribute named with "savedSkills".

Spring MVC displaying arraylist in JSP correctly

i have a problem whith the displaying of an arraylist in jsp. it displays everything in one line for each person making repetition .
i have a table with columns (phone number,fax,phone2,email)
here is my dao function:
#Override
public ArrayList<String> moyenCom(Authentication auth) {
String login=auth.getName();
List list;
List listres = null;
ArrayList<String> array1=new ArrayList<String>();
//ArrayList<ArrayList<String>> array=new ArrayList<ArrayList<String>>();
SessionFactory factory=new Configuration().configure().buildSessionFactory();
Session session=factory.openSession();
session.beginTransaction();
//Your operation
String sql1="select r.id_responsable from WEBCARE.PERSONNE p,WEBCARE.RESPONSABLE r,WBB_CLU.ABONNE_COMPTE ac,WBB_CLU.COMPTE_CLU c where p.id=r.id_responsable and r.id_abonne=ac.id_abonne and c.id_compte=ac.id_compte and c.login=:x";
SQLQuery query1 = session.createSQLQuery(sql1);
query1.setParameter("x",login);
query1.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP);
session.getTransaction().commit();
list=query1.list();
for(int i=0;i<list.size();i++){
String res =list.get(i).toString();
String[] parts = res.split("=");
String part2 = parts[1];
System.out.println("id du responsable est"+res);
System.out.println("id du responsable spliteeee est "+part2);
session.beginTransaction();
String sql="select mc.information from WEBCARE.MOYEN_COMMUNICATION mc,WEBCARE.PERSONNE p where p.id=mc.id_categorie and mc.id_categorie=:part2 and mc.categorie=1";
SQLQuery query = session.createSQLQuery(sql);
query.setParameter("part2",part2);
query.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP);
session.getTransaction().commit();
listres=query.list();
for(int i1=0;i1<listres.size();i1++){
String resu =listres.get(i1).toString();
System.out.println("info "+resu);
array1.add(resu);
}
}
System.out.println(array1);
return array1;
}
my controller :
#RequestMapping("/fichets")
public String fichets(Model model,Authentication auth){
Authentication authen = SecurityContextHolder.getContext().getAuthentication();
String name = authen.getName(); //get logged in username
model.addAttribute("moycoms",metier.moyenCom(auth));
return "InfoAbonneTS";
}
and my jsp page :
<c:forEach items="${resps}" var="resp">
<tr>
<td id="date">${resp.nom} ${resp.prenom}</td>
<td>${resp.poste}</td>
<td>${resp.password}</td>
<c:forEach items="${moycoms}" var="moycom">
<td>${moycom}</td>
</c:forEach>
</tr>
</tbody>
</c:forEach>
The function returns the field information witch contains all the 4 informations that should be displayed each in every column.
arraylist returned is :
{information=01234567890}, {information=01999999999}, {information=0199999333}, {information=resp1#gmail.com}, {information=00 }, {information=0622355114}, {information=0588888888}, {information=respons3#gmail.com}, {information=00 }, {information=0111111111}, {information=0666666666}, {information=responsable4#gmail.com}
so the first four information should be displayed each in every column ,the second four same thing...in this example i have 3 persons.
i can't display this correctly any help?
resps is for displaying the first 3 columns

Looking at the data it looks like a List of Map. Try this code
<c:forEach items="${moycoms}" var="moycom" varStatus="stat">
<c:if test="${stat.index%4==0 && stat.index!=0}">
<tr>
</c:if>
<td>${moycom['information']}</td>
<c:if test="${stat.index%4==0 && stat.index!=0}">
</tr>
</c:if>
</c:forEach>
stat variable is used to find the current index. We are adding the <tr> based on the index so that its done for every fourth index. If resp contains some identifier which could be used for finding the correct user then use <c:if> for matching. Please provide additional information

you are adding only "moycoms" attribute to the model object
but you jstl starts from
<c:forEach items="${resps}" var="resp">
you are not adding any "resps" param in your model object

play framework's input text value always passes 0

I've been working on a play form for a couple of days and am extremely frustrated. I went through the documentation and used the "Play with Java" book, and created a userWeights model class:
public class UserWeights {
public HashMap<ServicesWeights, Float> userWeights = new HashMap<>();
#Constraints.Required
public String user;
#Constraints.Required
public String password;
public int sampleSize;
public int misSampleSize;
}
My controller:
public class Application extends Controller {
private static final Form<UserWeights> userWeightsForm = Form.form(UserWeights.class);
public static Result index() {
return ok(index.render("Your new application is ready."));
}
public static Result finder () {
return ok(finder.render(userWeightsForm));
}
public static Result runWithUserInput () {
Form<UserWeights> boundForm = userWeightsForm.bindFromRequest();
if (boundForm.hasErrors()) {
return badRequest(index.render("FAIL"));
}
UserWeights weights = boundForm.get();
if (weights.checkboxChoices.get(0) != null && weights.checkboxChoices.get(0).equals("1")) {
runMethodA();
} else if (weights.checkboxChoices.get(1) != null && weights.checkboxChoices.get(1).equals("2")) {
runMethodB();
}
return TODO;
}
And the view:
#(UserWeightsForm: Form[UserWeights])
#import helper._
#import helper.twitterBootstrap._
#main("finder") {
<h1>Please fill the required fields</h1>
#helper.form(action = routes.Application.runWithUserInput(), 'enctype -> "multipart/form-data") {
<fieldset>
<legend>Finder</legend>
#helper.inputText(UserWeightsForm("user"),'_label -> "User")
#helper.inputPassword(UserWeightsForm("password"), '_label -> "Password")
<br/>
<label for="checkboxInput">Input Type:</label><br/>
<span class="buttonSet" id="checkboxInput">
<input type = "checkbox" id = "genericCheckbox" name = 'checkboxChoices[0]' value = "1">
<label for = "genericCheckbox">Generic Sample</label>
<input type = "number" name = 'UserWeightsForm("sampleSize")' id = "genericInput" value = "#UserWeightsForm("sampleSize").value"><br/>
<input type = "checkbox" id = "misCheckbox" name = 'checkboxChoices[1]' value = "2">
<label for = "misCheckbox">MisSample</label>
<input type = "number" name = 'UserWeightsForm("misSampleSize")' id = "misInput" value = "#UserWeightsForm("misSampleSize").value"><br/>
</span>
What I want - if the first checkbox is selected, the user will fill in the sampleSize text input field, and that value will be bounded to the form, while the misSampleSize field will be blank/zero/whatever (in this case I'm not using it anyway). And vice versa.
The problem - when I check the checkbox and fill in the sample text input, it binds the value 0 to the form.
I've tried setting the value in the input tag to null, removing it completely and using the template helper (I prefer to avoid it because it's not as flexible). I can't understand why the number I enter into the text field is ignored, and my programs considers it to be 0.
So question 1: How do I stop the 0 value being populated?
question 2 How can I send a value for one of the text fields (sampleSize or misSampleSize), and leave the other one empty, without getting form errors?
Thanks!

I work in Scala, not Java. But you I think you need your input id and name fields to match your form field names. It uses those to bind. You don't show your UserWeightsForm, but you could try something like:
<input type="number" name='sampleSize' id="sampleSize" value="#UserWeightsForm("sampleSize").value.getOrElse("0")"><br/>
<input type="number" name='misSampleSize' id="misSampleSize" value="#UserWeightsForm("misSampleSize").value.getOrElse("0")"><br/>
I also use a "getOrElse" on the value in case (error perhaps) there is no value.

<c:foreach jsp iterate over list

I have searched several examples, still have not get. I am passing an List of GOOD object from controller into jsp pages. trying to loop over the list object, but its showing only one element repeatedly. should I use beans? If yes, could you provide more specific example for my case.
<c:if test="${not empty listGood}">
<c:forEach var="ob" varStatus="status" items="${listGood}">
<tr>
<td><c:out value="${ob.name}"/></td>
<td><c:out value="${ob.measure}"/></td>
<td><c:out value="${ob.quantity}"/></td>
<td><c:out value="${ob.price}"/></td>
</tr>
</c:forEach>
</c:if>
Update
Here is the controller:
#RequestMapping(value={"/supply"}, method=RequestMethod.POST)
public String consumptFormulate(Locale locale, Model model, #ModelAttribute ConsumptionForm cmd, HttpServletRequest request){
String[] s_str =cmd.getFromDate().split("/");
String normal_s = s_str[2]+"-"+s_str[0]+"-"+s_str[1];
String[] f_str = cmd.getToDate().split("/");
String normal_f = f_str[2]+"-"+f_str[0]+"-"+f_str[1];
List<Good> list = service.getGoods(normal_s,normal_f,cmd.getSocGoods(),cmd.getTradeObj());
List<ListGoodsForm> listg = new ArrayList<ListGoodsForm>();
org.jfree.data.xy.XYSeries series = new org.jfree.data.xy.XYSeries("За месяц:");
if(!list.isEmpty()){
lg=list;
ListGoodsForm listo = new ListGoodsForm();
java.util.Calendar ca = java.util.Calendar.getInstance();
for(Good g: list){
listo.setName(g.getName());
listo.setMeasure(g.getMeasure());
listo.setPrice(g.getPrice());
listo.setQuantity(g.getQuantity());
listg.add(listo);
java.util.Date date = g.getDates();
java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("MMMM");
ca.setTime(date);
int in = ca.get(java.util.Calendar.MONTH);
String month = format.format(date);
}
}
request.setAttribute("listGood",listg);
//model.addAttribute("listGood", listg);
model.addAttribute("GOODS", prepareDataList());
// model.add
model.addAttribute("COMPANY",sservice.getSupplierName());
model.addAttribute("consumptionForm", cmd);
return "supply";
}

My guess is that your controller is doing the following:
Good g = new Good();
List<Good> goods = new ArrayList<Good>();
for (int i = 0; i < 4; i++) {
g.setName("a");
...
goods.add(g);
}
This means that you're modifying the same Good object 4 tilmes, and adding it 4 times to the list. In the end, your have 4 times the same object, containing the state you set into it in the last iteration.
Instead, do this:
List<Good> goods = new ArrayList<Good>();
for (int i = 0; i < 4; i++) {
Good g = new Good();
g.setName("a");
...
goods.add(g);
}
EDIT : and your edited question just confirmed my guess:
ListGoodsForm listo = new ListGoodsForm();
this line should be inside the for loop, and not outside.

use this code to pass list
request.setAttribute("listGood",listg);

Play Framework 2.0 form helper: from checkbox to List<String>

I have a model that contains a String and a list:
public String title;
public List<String> topics;
In index.scala.html I use a form to add new items:
#form(routes.Application.newPaper()) {
#inputText(paperForm("title"))
<input type="submit" value="Create">
}
with a simple String, this works nicely. But I would like to show checkboxes
#for(t <- topics) {
<input type='checkbox' name='topic' value=#t>#t <br>
}
and subsequently add all checked 'topics' to the List<String> topics; of my new item. How can I process the checkboxes within #form{ ... }?

I am using Play!Framework 2.1.0, below is the solution :
1. In the scala template, you must give all checkbox name like this:
#form(action = routes.Application.newPaper()) {
#inputText(paperForm("title"))
#******* Indexed chekbox name *********#
#for((t, index) <- topics.zipWithIndex) {
<input type="checkbox" name="topics[#index]" value="#t">#t <br>
}
<input type="submit" value="Create">
}
2. Then in your controller, as an action to handle form submit, you should doing something like this :
public static Result newPaper() {
// Bind submitted form value to your model, ex. Paper.java
Form<Paper> paperForm = Form.form(Paper.class).bindFromRequest();
Paper paper = paperForm.get();
Logger.info("Title entered = " + paper.title);
// Because in template we use indexed name, unchecked item are binded with null value
paper.topics.removeAll(Collections.singleton(null)); // remove value for unchecked topic
for (String t : paper.topics) {
Logger.info("The topic is " + t);
}
Logger.info("Total topic selected = " + paper.topics.size());
return redirect(routes.Application.index()); // redirect page
}
UPDATE
This is another idea to the solution. Your checkbox code on scala template is not modified.
#for(t <- topics) {
<input type='checkbox' name='topic' value=#t>#t <br>
}
So the controller should be like this :
public static Result newPaper() {
// Bind submitted form value to your model, ex. Paper.java
Form<Paper> paperForm = Form.form(Paper.class).bindFromRequest();
Paper paper = paperForm.get();
// get request value from submitted form
Map<String, String[]> map = request().body().asFormUrlEncoded();
String[] checkedVal = map.get("topic"); // get selected topics
// assign checked value to model
paper.topics = Arrays.asList(checkedVal);
// for debugging purpose
for (String t : paper.topics) {
Logger.info("The topic is " + t);
}
Logger.info("Total topic selected = " + paper.topics.size());
return redirect(routes.Application.index()); // redirect page
}
Hope this idea is more elegant.. :)
Note: I have tested on Play!Framework 2.1.1 too, and that is work for me.