[WICKET-6069] OnChangeAjaxBehavior does not work if the url contains a request parameter with same name as wicket id

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.21.0
• Fix Version/s: 7.3.0, 8.0.0-M1, 6.22.0
• Component/s: wicket
• Assignee: Martin Tzvetanov Grigorov
• Reporter: Robin Shine
• Created: 08/Jan/16 09:53
• Updated: 06/Feb/16 14:25
• Resolved: 06/Feb/16 14:23

Description

To demonstrate the issue, create below simple page:

"HomePage.html"

<wicket:extend>
  <select wicket:id="choice"></select>
</wicket:extend>

"HomePage.java"

public class HomePage extends WebPage {
	private String choice = "a";
	
	@Override
	protected void onInitialize() {
		super.onInitialize();

		List<String> choices = new ArrayList<String>();
		choices.add("a");
		choices.add("b");
		add(new DropDownChoice<String>("choice", new IModel<String>() {

			@Override
			public void detach() {
			}

			@Override
			public String getObject() {
				return choice;
			}

			@Override
			public void setObject(String object) {
				choice = object;
			}
			
		}, choices).add(new OnChangeAjaxBehavior() {

			@Override
			protected void onUpdate(AjaxRequestTarget target) {
				System.out.println(choice);
			}
			
		}));		
	}
}

This simple page prints out choosed value via OnChangeAjaxBehavior, it works fine if you access the page via http://localhost:8080. However it always prints "null" if you access the page with a request parameter the same name as the wicket id, for instance: http://localhost:8080/?choice=somevalue
It works again if you use different value for wicket id of the choice component and request parameter.