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public final class MyRequestCycle extends WebRequestCycle {

	/**
	 * MyRequestCycle constructor
	 * 
	 * @param application the web application
	 * @param request the web request
	 * @param response the web response
	 */
	public WebRequestCycle(final WebApplication application, final WebRequest request, final Response response) {
		super(application, request, response);
	}
		
	/**
	 * {@inheritDoc}
	 */
	@Override
	protected final Page onRuntimeException(final Page cause, final RuntimeException e) {
		// obviously you can check the instanceof the exception and return the appropriate page if desired
		return new MyExceptionPage(e);
	}
}

getSession().error(message);
throw new RestartResponseException(MyErrorPage.class, optionalPageParameters);
// use RestartResponseAtInterceptPageException(MyErrorPage.class);
// instead to interrupt current request processing and immediately redirect to an intercept page

// it may be tempting to do the following, but it should not be done:
// error(message);
// setResponsePage(MyErrorPage.class);
// Why not?

// What about this; will it work? (My experience says no, but I don't know why not.)
// getSession().error(message);
// setRedirect(true);
// setResponsePage(MyErrorPage.class);