常见Spring相关工具报错-源码分析

1. Resouce Bundle 国际化 yml 配置不生效

1️⃣ 配置yml

2️⃣ 报错信息

• 2024-04-15 15:13:57.828 [http-nio-8090-exec-1] WARN o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - [doResolveHandlerMethodException,434] - Failure in @ExceptionHandler com.example.config.exception.GlobalExceptionHandle#handleI18nException(I18nException, HttpServletRequest) org.springframework.context.NoSuchMessageException: No message found under code 'global.not.null' for locale 'zh_tw'.

3️⃣ 源码分析 MessageSourceAutoConfiguration 配置类

在 getResources 中会获取 getResources(“classpath*:” + i18n/messages + “.properties”)，但是缺少messages.properties属性文件

		private ConditionOutcome getMatchOutcomeForBasename(ConditionContext context, String basename) {
			ConditionMessage.Builder message = ConditionMessage.forCondition("ResourceBundle");
			for (String name : StringUtils.commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(basename))) {
				for (Resource resource : getResources(context.getClassLoader(), name)) {
					if (resource.exists()) {
						return ConditionOutcome.match(message.found("bundle").items(resource));
					}
				}
			}
			return ConditionOutcome.noMatch(message.didNotFind("bundle with basename " + basename).atAll());
		}

		private Resource[] getResources(ClassLoader classLoader, String name) {
			String target = name.replace('.', '/');
			try {
				return new PathMatchingResourcePatternResolver(classLoader)
						.getResources("classpath*:" + target + ".properties");
			}
			catch (Exception ex) {
				return NO_RESOURCES;
			}
		}
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4️⃣ 解决：补充 messages.properties 文件