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This is due to a hard to fix issue. As long as that issue is open, people should avoid setting id attributes on tags that are coupled to components that use rely on the markup id (setOutputMarkupId true). See http://issues.apache.org/jira/browse/WICKET-694 – Eelco

Avoid using

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empty elements (i.e. <textarea />)

Wicket will not automatically expand an open-close tag empty element (i.e., an element that is expressed as a single tag ending in "/>") during the rendering phase. You should always include both an open tag and a close tags tag in your markup when you want Wicket to include content in the tag body.

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