spring:bind error using in a List

Question

I have a list containing users. I am trying to print it in JSP but some how I am not able to get it to print it. Getting this exception HTTP Status 500 - javax.servlet.ServletException: javax.servlet.jsp.JspTagException: Neither BindingResult nor plain target object for bean name 'users[0]' available as request attribute

Code in JSP

<c:forEach items="${users}" var="user" varStatus="status">
   <spring:bind path="users[${status.index}].name">
      <c:out value="${status.value}" />
   </spring:bind>
</c:forEach>

Controller

ModelAndView modelAndView = new ModelAndView("go_some_JSP_page");
List<UserEntity> users = userManager.getAllObjects();
modelAndView.addObject("users", users);

BTW, UserEntity has name field. If I remove the binding and try to print the user.name using <c:out value="user.name" /> it prints the value

Where am I going wrong and what do I need to do? Thanks

Not working code below. [I have to invoke formatting on field @NumberFormat so have to try it using status variable]

<spring:bind path="user.name">
   <c:out value="${status.value}" />
</spring:bind>

Gets this error --> javax.servlet.ServletException: javax.servlet.jsp.JspTagException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute

So added a bean binding and then I get empty table :(. I believe thats because the instance is empty. So this does not seems like a right approach.

@ModelAttribute("user")
public UserEntity userEntityBinding() {
    return UserEntity.newInstance();
}

A working code exists at https://github.com/hth/StatusInvoke.git

Let me know if you face any problem deploying it.

This question has been solved. Thanks for looking at it.

score 1 · Answer 1 · edited May 23 '17 at 11:48

1

You can try using LazyList instead of simple list. If you want to take a look at the example then you can refer one of my question. In the question statement I have mentioned how to use the LazyList.

Hope that helps you. Cheers.

edited May 23 '17 at 11:48

Community

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answered Jan 08 '13 at 12:25

Japan Trivedi

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I found the solution and the code is posted on github. A working code exists at https://github.com/hth/StatusInvoke.git – java_dude Jan 09 '13 at 07:06
ok. I thought you want to bind the values of the list to the jsp controls. So I thought this would be more easy. :) – Japan Trivedi Jan 09 '13 at 07:10

NimChimpsky · Answer 2 · 2013-01-01T20:20:29.367

0

this, if the modelandview are returned, is the correct way to populate the list

ModelAndView modelAndView = new ModelAndView("go_some_JSP_page");
List<UserEntity> users = userManager.getAllObjects();
modelAndView.addObject("users", users);

And this is the correct way to reference the list

<c:forEach items="${users}" var="user" varStatus="status">
    <spring:bind path="user.name">
      <c:out value="${status.value}" />
   </spring:bind>
</c:forEach>

Your problem must be elsewhere is the name field definitely populated, is the correct jsp being called... the above code is correct and should work.

edited Jan 01 '13 at 20:20

answered Dec 31 '12 at 10:52

NimChimpsky

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userManager is not returning `user` empty. If I remove the binding and just print out the `user` it prints. – java_dude Dec 31 '12 at 22:22
After changing the binding I see this error `javax.servlet.ServletException: javax.servlet.jsp.JspTagException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute` – java_dude Dec 31 '12 at 23:11
I assume you are asking what is the result of the code posted above :) Its actually blank. I see empty table. I have mentioned that in my posting. And the empty result is because of the empty object `UserEntity` – java_dude Jan 01 '13 at 19:01
I have tried as you have mentioned and it still does not work. For reference I have created a sample code to test at https://github.com/hth/StatusInvoke.git – java_dude Jan 02 '13 at 06:03
@java_dude you are redirecting from your index, to landing without actually calling the controller. Be sure to call your code using the url "/landing". – NimChimpsky Jan 02 '13 at 15:50
If the controller is not being called then how is the page being populated with data. Have you tried putting a break point in controller at ModelAndView? – java_dude Jan 02 '13 at 17:35
@java_dude its not being populated with data, according to yr question – NimChimpsky Jan 02 '13 at 17:36
The data is getting populated but its not using ` – java_dude Jan 02 '13 at 17:47
I understand what you are saying. The reason why I have to get the uncommented section working is because the formatting code gets called through `var=status`. The UserEntity has @NumberFormat annotation and that would be called through `status` alone. If I print balance without status, then annotation would not be invoked and no formatting would show up. Hope this clears it. – java_dude Jan 02 '13 at 18:38

score 0 · Accepted Answer · answered Jan 03 '13 at 01:19

0

The correct answer to invoke @NumberFormat annotation is by using spring:eval expression tag

<spring:eval expression="user.balance" />

This invokes the annotation and performs formatting as mentioned in the annotation

answered Jan 03 '13 at 01:19

java_dude

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score 0 · Answer 4 · answered Jan 04 '13 at 18:54

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I don't think you can use spring:bind in that case, AFAIK it tries to get the variable from the ModelMap, it's not able to get it from the "for" var.

answered Jan 04 '13 at 18:54

beder

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Can you give more information as I am not able to understand what you are suggesting as alternative – java_dude Jan 07 '13 at 02:25

spring:bind error using in a List

4 Answers4