Adding values from multiple inputs to the arraylist

Question

I' have a simple problem with adding values from inputs to the ArrayList.

I have a POJO like this:

public class Person {

    private String firstName;
    private String lastName;
    private List<String> friends=new ArrayList<>();
    //getters and setters

then Backing bean:

  public class backingBean{
          Person p=new Person();

          public void addPerson(){

             for(String friend:p.getFriends)
                System.out.println(friend);
           }


}

and the view

        <h:form>
            <fieldset>
                <h:panelGrid columns="2">

                    <h:outputText value="Name" />
                    <h:inputText value="{backingBean.person.firstName}"/>              

                    <h:outputText value="LastName" />
                    <h:inputText value="#{backingBean.person.lastName}"/>


                    <h:outputText value="Friends" />
                    <h:inputText value="#{backingBean.person.friends}" />
                    <h:inputText value="#{backingBean.person.friends}" />

                </h:panelGrid>
                <h:commandButton  value="Add"
                    action="#{backingBean.addPerson}" />

            </fieldset>
        </h:form>

When I try to addPerson I get this error:

summary=(Conversion Error setting value...

I don't understand why convert String to String?

`Person` is a complex type, you'll need a converter. Besides that, what are your expectations for binding an input text to an arrayList? — kolossus, Apr 01 '13 at 20:41
Is there any shortcut besides converter, because I need it just for simple test for adding values into arraylist — Mitja Rogl, Apr 01 '13 at 20:43
@extra90 **please** tell us if this is for JSF 1.2 or JSF 2. — Luiggi Mendoza, Apr 01 '13 at 21:23
@extra90 Is your requirement only to add two friends or more friends will be added later. — Wizard Sultan, Apr 01 '13 at 21:54
Sorry for late response. It is jsf 2. it can be added more then two friends. — Mitja Rogl, Apr 02 '13 at 12:33

partlov · Answer 1 · 2013-04-02T06:29:39.247

2

You can't bind value of h:inputText to ArrayList (without converter). When you submit form (by clicking button) JSF tries to call setFriends(String) and this is where this Exception occurs. Try to figure out what you are trying to achieve with these two h:inputText elements.

edited Apr 02 '13 at 06:29

answered Apr 01 '13 at 20:39

partlov

13,789
6
63
82

I'm trying to add friends names into arraylist. These inputs meant to be for adding into arraylist – Mitja Rogl Apr 01 '13 at 20:41
The first part if your statement is technically incorrect. That was the reason behind converters. – skuntsel Apr 02 '13 at 05:12
I founded the solution. Thanks for help :) – Mitja Rogl Apr 02 '13 at 13:48

score 0 · Answer 2 · edited May 23 '17 at 12:21

if you want to add 2 friends, just create only 2 different variables in backing bean as :

private String friend1;
private String friend2;

and then add them in addPerson like this:

    List<String> friends=new ArrayList<String>();
    friends.add(friend1);
    friends.add(friend2);

    p.setFriends(friends);

Not tested can be some bugs.

EDIT:

And if this not satisfies you, you can look at this @BalusC ANSWER

Adding values from multiple inputs to the arraylist

2 Answers2