#springMessage 错误分析

#**
 * springMessage
 *
 * Macro to translate a message code into a message.
 *#
#macro( springMessage $code )$springMacroRequestContext.getMessage($code)#end

public abstract class AbstractTemplateView extends AbstractUrlBasedView {

    /**
     * Variable name of the RequestContext instance in the template model,
     * available to Spring‘s macros: e.g. for creating BindStatus objects.
     */
    public static final String SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE = "springMacroRequestContext";

if (this.exposeSpringMacroHelpers) {
			if (model.containsKey(SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE)) {
				throw new ServletException(
						"Cannot expose bind macro helper ‘" + SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE +
						"‘ because of an existing model object of the same name");
			}
			// Expose RequestContext instance for Spring macros.
			model.put(SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE,
					new RequestContext(request, response, getServletContext(), model));
		}

	/**
	 * Retrieve the message for the given code, using the "defaultHtmlEscape" setting.
	 * @param code code of the message
	 * @return the message
	 * @throws org.springframework.context.NoSuchMessageException if not found
	 */
	public String getMessage(String code) throws NoSuchMessageException {
		return getMessage(code, null, isDefaultHtmlEscape());
	}