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How do I add custom error pages?

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There are also some other neat settings you should check out in getApplicationSettings(), getDebugSettings(), getExceptionSettings(), getMarkupSettings(), getPageSettings(), getRequestCycleSettings(), getSecuritySettings and getSessionSettings(). See the javadoc for more information.

If calling setInternalErrorPage(), make sure to also call:

// show internal error page rather than default developer page
getExceptionSettings().setUnexpectedExceptionDisplay(IExceptionSettingsExceptionSettings.SHOW_INTERNAL_ERROR_PAGE);

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This is assuming that you have mapped "/404" in your WebApplication:

	mount(new HybridUrlCodingStrategymountPage("/404", PageNotFound.class));

In your error WebPage:

public class PageNotFound extends WebPage {

	private static final long serialVersionUID = 1L;

	public PageNotFound() {
		// Add any necessary components
	}

	@Override
	protected void configureResponse() {
		super.configureResponse();
		getWebRequestCycle().getWebResponse().getHttpServletResponse().setStatus(HttpServletResponse.SC_NOT_FOUND);
	}

	@Override
	public boolean isVersioned() {
		return false;
	}

	@Override
	public boolean isErrorPage() {
		return true;
	}

}

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// also see AbortWithWebErrorCodeException and AbortWithHttpStatusException
throw new AbortWithHttpStatusException(404, true);

For wicket 6 and beyond:

throw new AbortWithHttpErrorCodeException(404, "Some message");

Overriding All Error Pages for RuntimeException

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