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java.lang.NullPointerException: 	at$	at	at	at$1.populateItem(	at org.apache.wicket.markup.html.list.ListView.onPopulate(	at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(	at org.apache.wicket.Component.internalBeforeRender(	at org.apache.wicket.Component.beforeRender(	at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(	at org.apache.wicket.Component.onBeforeRender(	at