感谢冷月的帮助，本文是依照冷月的博客所写。冷月博客地址 http://www.huqiwen.com/2014/09/18/exception-wap-portal-status-not-found/

在EXT项目中修改 com.liferay.portal.servlet.BrowserSnifferImpl.java 内容

@Override
	public boolean isWapXhtml(HttpServletRequest request) {
		String accept = getAccept(request);

		if (accept.contains("wap.xhtml")) {
			return true;
		}

		return false;
	}

为

	@Override
	public boolean isWapXhtml(HttpServletRequest request) {
//		String accept = getAccept(request);
//
//		if (accept.contains("wap.xhtml")) {
//			return true;
//		}

		return false;
	}