springboot log4j2为什么不能打印框架错误日志
问题
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
解决方案
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
1. 排除原生logback日志,否则会冲突
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< 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 >
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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
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< dependency >
< groupId >org.springframework.boot</ groupId >
< artifactId >spring-boot-starter-log4j2</ artifactId >
</ dependency >
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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
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< 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 >
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配置后的效果
如下图所示,我写了两个 @RequestMapping() value="listTree"的方法
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@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);
}
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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 method
public com.ld.model.json.JsonResult com.ld.action.area.AreaController.getAreaTree() mapped. org.apache.commons.logging.impl.Jdk14Logger.log(Jdk14Logger.java:99)
springboot 2.0 log4j2日志打印问题
日志不能正常打印,测试、线上环境未生成滚动日志
日志文件配置:
控制台信息:
解决办法:
在pom 文件中
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< 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 >
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或者:
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< 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 >
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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服务器之家。
原文链接:https://blog.csdn.net/mengxiangxingdong/article/details/86131878