Map inside Map with ui:repeat throws UpdateModelException

Question

There is a

Map<String,Map<Double,Double>> priceMatrix

I want to use it in a

<ui:repeat value="#{calcModel.priceMatrix.keySet().toArray()}" var="x">
    <div style="display: inline-block; margin-right: 10px">
        <h:inputText value="#{x}" />
    </div>
    <ui:repeat value="#{calcModel.priceMatrix.get(x).keySet().toArray()}" var="y">
        <div style="display: inline-block; margin-right: 10px">
            <h:inputText value="#{y}" />
        </div>
        <div style="display: inline-block;">
            <h:inputText value="#{calcModel.priceMatrix.get(x).get(y)}" />
        </div>
        <br />
    </ui:repeat>

</ui:repeat>

if i post the formular, i get a UpdateModelException with the Message:

value="#{calcModel.priceMatrix.get(x).get(y)}": Illegal Syntax for Set Operation

This issue is making me terrible since over 6 hours. My first idea was to provide own getter and setter in my bean. This dosn't work because jsf calls the getter before calling the setter.

Is there a solution for my problem?

Would it be better to work with List?

Thank you!

My fault, JSF does not require Setters on Maps. And it is able to handle Maps too.. For a simple Map it is like: `` But with a Map in a Map? — Spielername, Feb 23 '16 at 12:07
Sorry, I have no idea, did not tried something like this yet. But I am very interested in a possible solution for this use case :) — Spielername, Feb 23 '16 at 12:17

BalusC · Accepted Answer · 2016-02-23T19:23:22.160

<h:inputText value="#{calcModel.priceMatrix.get(x).get(y)}" />

This is indeed not a writable value expression. This represents a read-only value expression. EL can't figure out how to invoke setters on it as the EL expression represents a chain of method calls not nested properties.

You need to replace it by a writable value expression with help of brace notation [] which represents nested properties.

<h:inputText value="#{calcModel.priceMatrix[x][y]}" />

Your other inputs also don't look good, value="#{x}" is surely also not writable, but you'll by now able to figure out the right syntax: just use #{map[key]} syntax instead of #{key}.

Note that this is not specifically a JSF problem. The root cause your exception as you can find further down in stack trace is a javax.el.PropertyNotWritableException. As its package javax.el says, it's an EL problem, not a JSF one.

That work better but there are still errors. The post works now. But value Changes on are not working. Old values stay after reload. And changes on push a new entry in the map. Thats crazy. Any solution? Thank you. — Moinsn, Feb 23 '16 at 15:37
@Moinsn, preferably you open new questions for new problems so you don't overburden one person, and others can benefit from the answers. — DavidS, Feb 23 '16 at 19:29

Map inside Map with ui:repeat throws UpdateModelException

1 Answers1