Vaadin can't find BeanContainer's Id Property

Question

I'm trying to create a table with a BeanContainer after populating it. However, when I try to run it, I get the following error message:

java.lang.IllegalStateException: Property RoomID not found

The relevant code is below (in which rooms can create a list of random Room objects). The Room class has a RoomID integer, and while it is a private variable the code produces the same error even if RoomID isn't private. I've also made sure that r_list actually contains Room instances.

BeanContainer<Integer, Room> r_cont = new BeanContainer<Integer, Room>(Room.class);
r_cont.setBeanIdProperty("RoomID");

//fetches all rooms and adds them to the bean container
List<Room> r_list = rooms.getRooms();
for (Room room: r_list)
    r_cont.addBean(room);

EDIT: Here's the notable part of the Room object. I left out the initialization method and the methods for setting/getting the other variables.

package Entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="Room")
public class Room {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="RoomID")
    private int RoomID;

    ...

    public int getRoomID(){
        return RoomID;
    }

    ...

}

sure it's not `roomID`? could you please add also the (relevant parts of) code of your Room class? — cfrick, Feb 18 '15 at 19:03
@cfrick I edited my original post to include the Room class code. — Markus M., Feb 18 '15 at 19:39
unrelated: by convention, attributes are named starting with a lowercase char (roomID or roomId) in java. — cfrick, Feb 18 '15 at 19:56

score 2 · Accepted Answer · edited May 23 '17 at 11:56

2

The property name is not deducted from the the actual variable holding it, but from the getter/setter. This means it should be roomId (see e.g. Where is the JavaBean property naming convention defined?). If you are not sure about the properties you hold, you can debug it on the container with: .getContainerPropertyIds().

edited May 23 '17 at 11:56

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answered Feb 18 '15 at 19:52

cfrick

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Vaadin can't find BeanContainer's Id Property

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