springboot log4j2不能打印框架错误日志的解决方案

使用springboot时老的框架使用的是log4j2，为了兼容不能够使用logback，按照网上的教程导入了log4j2但是不能够输入框架错误日志，例如bean命名重复，springmvc url映射重复，这些都是开发中所需要的友好提示

怎么出现的问题，就不详细描述了，原因是我引入的log42是散件不是基于springboot集成配置的，导致只能够输出基本信息，原理我会在 一个月后左右探究完毕补充。

下面我说说怎么正确用springboot输出springboot框架错误的

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <!-- spring boot 默认的日志框架是Logback,所以在引用log4j之前，需要先排除该包的依赖，再引入log4j2的依赖 --> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency>2. 引入集成springboot配置的log4j2

我出现的我问题就是这里，我引入的是原先ssm用的log4j2导致，没有正确注入，初始log4j失败了，所以选择最省事的法子，引入人家写好的log4jpom

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j2</artifactId> </dependency>

可以看看人家默认的pom.xml引入的log4j，就知道自己引用出错在哪里了

<dependencies> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-slf4j-impl</artifactId> <version>2.10.0</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.10.0</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-jul</artifactId> <version>2.10.0</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>jul-to-slf4j</artifactId> <version>1.7.25</version> <scope>compile</scope> </dependency> </dependencies>

配置后的效果

如下图所示，我写了两个 @RequestMapping() value='listTree'的方法

@RequestMapping('listTree') @ResponseBody public JsonResult getAreaTree() {List<AreaModel> all = areaService.findAll();all.forEach(x -> x.setName(x.getAreaName()));return new JsonResult(all); } @RequestMapping('listTree') @ResponseBody public JsonResult getAreaTree2() {List<AreaModel> all = areaService.findAll();all.forEach(x -> x.setName(x.getAreaName()));return new JsonResult(all); }

正确打印错误日志

[reform]2019-01-09 09:31:47.570 [WARN]:Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ’requestMappingHandlerMapping’ defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map ’areaController’ method public com.ld.model.json.JsonResult com.ld.action.area.AreaController.getAreaTree2()to {[/area/listTree]}: There is already ’areaController’ bean methodpublic com.ld.model.json.JsonResult com.ld.action.area.AreaController.getAreaTree() mapped. org.apache.commons.logging.impl.Jdk14Logger.log(Jdk14Logger.java:99)

日志不能正常打印，测试、线上环境未生成滚动日志

在pom 文件中

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> <exclusions><!-- 排除自带的logback依赖 --><exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId></exclusion> </exclusions></dependency>

或者：

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions><!-- 排除自带的logback依赖 --><exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId></exclusion><exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId></exclusion> </exclusions></dependency>

以上为个人经验，希望能给大家一个参考，也希望大家多多支持好吧啦网。