messages.properties keys with multiple dots not working

Question

I am using a messages.properties bundle for my .xhtml page. I can access the keys and use them if they have a single name. Chaining keys for the same category and dividing them by . causes problems.

eg messages.properties:

bookTitle=Title

I load my bundle like this:

<f:loadBundle var="msg" basename="messages"/>

and use the bundle like this:

<p:column headerText="#{msg.bookTitle}" filterBy="#{row.book.title}" filterMatchMode="contains">
    <h:outputText value="#{row.book.title}" />
</p:column>

This work perfectly fine.

Problem:

Using:

book.title=Title
book.url=URL

I can't access the values with #{msg.book.title} and get the following error message:

headerText="#{msg.book.title}": Property [title] not found on type [java.lang.String]

I'm using Lombok to generate getters and setters. I fear the problem is that the first key book is retrieved as a String and then lombok tries to use the getTitle() method on a String object (book) and thus throws an exception

Answer 1

Use

#{msg['book.title']}

instead. That should be it.
This is a syntax which, imho, should be used only for keys which have a dot as part of the name.

Btw, Lombok has no part in this.