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The Wicket 1.4.0 extensions are missing from the Wicket plugin. To reproduce, try taking the Wicket tutorial at http://www.netbeans.org/kb/docs/web/quickstart-webapps-wicket.html. When you try to do the section on adding Ajax features, you discover that the class org.apache.wicket.extensions.ajax.markup.html.autocomplete.AutoCompleteTextField does not exist. In fact, no package org.apache.wicket.extensions.* is on the classpath. To work around this, the user has to download the file wicket-extensions-1.4.0.jar and manually add it to the classpath.
Geertjan, can you please take a look at this issue? Thanks!
This is not an issue in NetBeans. This is an issue for the Wicket plugin which is at nbwicketsupport.dev.java.net. Please file this issue there. I am closing it here as invalid.
Fixed in latest version of the plugin, which includes the Wicket extensions JAR.