Regression: columns in document list cannot be sorted anymore

Clicking a column header in the documents list no longer sorts the list on that column. This only happens when Wicket runs in production mode. The sorting does work when Wicket runs in development mode.

Steps to reproduce:
1. run the archetype CMS in Wicket production mode (e.g. start it with just "mvn -Pcargo.run")
2. select a folder in the documents tree with more than one document or child folder
3. click the 'Name' column header

Expected: all children (documents and/or folders) are sorted alphabetically. Clicking the header again reverts the sort order.
Actual: nothing happens

This error is related to the many warnings the are logged when Wicket does in the development mode and a document list is shown. For example, just opening the browse perspective already logs eight warnings:

[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body6a, component id: header_body, component tag: body.
[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body6b, component id: header_body, component tag: body.
[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body6c, component id: header_body, component tag: body.
[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body6d, component id: header_body, component tag: body.
[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body6e, component id: header_body, component tag: body.
[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body6f, component id: header_body, component tag: body.
[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body70, component id: header_body, component tag: body.
[INFO] [talledLocalContainer] 12.12.2013 14:51:22 WARN http-bio-8080-exec-1 [Component.renderComponentTag:3979] Markup id set on a component that is usually not rendered into markup. Markup id: header__body71, component id: header_body, component tag: body.