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Editorial Team
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Asked: 2026-05-19T22:40:02+00:00

I am facing an issue with spring and it goes as follows: In SessionAttributes

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I am facing an issue with spring and it goes as follows:

In SessionAttributes I have an object person with an attribute addresses which is a list. Whenever person is updated via controler, previous entries still remain. So for example if I had in person addresses: old address 1, old address 2, old address 3 and I update person via form to have only one new address, list of addresses becomes: new address 1, old address 2, old address 3 while intended behavior is to have “new address 1” only. I couldn’t seem to find a workaround this problem. I am using Spring 3.0.X.

Please find below all related code that shows the issue on hand.

Person.java:

package com.convert.dashboard.web.test;

import java.util.List;

public class Person {

private String name;

private Integer age;

private List<String> addresses;

public Person(List<String> addresses) {
    this.addresses = addresses;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public Integer getAge() {
    return age;
}

public void setAge(Integer age) {
    this.age = age;
}

public List<String> getAddresses() {
    return addresses;
}

public void setAddresses(List<String> addresses) {
    this.addresses = addresses;
}

}

TestController.java

package com.convert.dashboard.web.test;

import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/test")
@SessionAttributes("person")
public class TestController {

@RequestMapping(value = "/")
public ModelAndView xyz() {
    ModelAndView mav = new ModelAndView();
    List<String> abc = new ArrayList<String>();
    abc.add("old address1");
    abc.add("old address2");
    abc.add("old address3");
    Person person = new Person(abc);
    mav.addObject("person", person);
    mav.setViewName("cForm");
    return mav;
}

@RequestMapping("/save")
public @ResponseBody
String process(@ModelAttribute("person") Person person) {
    return "<body>" + " Name:" + person.getName() + "  Age: " + person.getAge() + " Addresses: " + person.getAddresses();
}
}

cForm.jsp:

<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"       "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>populate form</title>
</head>
<body>
<form:form modelAttribute="person" action="/dashboard/test/save">

<form:hidden path="name" value="X" />
<form:hidden path="age" value="20" />
<form:hidden path="addresses[0]" value="New address" />
<input type="Submit" value="Submit" />
</form:form>
</body>
</html>
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1 Answer

  1. Editorial Team

    So the solution goes as follows:

    By appending an AJAX call on remove on the client side and adding the code below to the controller.

        @RequestMapping("/remeveAddress")
    public @ResponseBody String removeElement(@ModelAttribute("person") Person person, @RequestParam Integer addressId, Model model){
    person.getAddresses().remove(addressId);
    model.addAttribute("person", person);
    return "{}";
    }
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