Description
Described in the mailing list:
http://mail-archives.apache.org/mod_mbox/wicket-users/201407.mbox/%3CCAF2_608c8TOZjprV8Md15KJpRET6YQdXHe%3DwRzF-y5G_zAXcDg%40mail.gmail.com%3E
I'm aware of the another issue (https://issues.apache.org/jira/browse/WICKET-3413) which dealt with the exact same code - and I believe there was a mistake in the solution that leads to this issue.
Please see the attached quickstart (including a JUnit test) to reproduce the error.