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< span class = "token tag" > < span class = "token tag" > < span class = "token punctuation" > < /< / span > root< / span > < span class = "token punctuation" > > < / span > < / span >
< span class = "token tag" > < span class = "token tag" > < span class = "token punctuation" > < /< / span > configuration< / span > < span class = "token punctuation" > > < / span > < / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > The result of the < code > logger< / code > command:< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@2062< span class = "token punctuation" > ]< / span > $ logger
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
level INFO
effectiveLevel INFO
additivity < span class = "token boolean" > true< / span >
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
< span class = "token function" > file< / span > app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
appenderRef < span class = "token punctuation" > [< / span > APPLICATION< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > In the < code > appenders< / code > section:< / p > < ul > < li > The target of < code > CONSOLE< / code > logger is < code > System.out< / code > < / li > < li > < code > APPLICATION< / code > logger is < code > RollingFileAppender< / code > , the file is < code > app.log< / code > < / li > < li > < code > ASYNC< / code > its < code > appenderRef< / code > is < code > APPLICATION< / code > , which means asynchronous output to the file< / li > < / ul > < h3 id = "view-logger-information-for-the-special-name" tabindex = "-1" > < a class = "header-anchor" href = "#view-logger-information-for-the-special-name" aria-hidden = "true" > #< / a > View logger information for the special name< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@2062< span class = "token punctuation" > ]< / span > $ logger -n org.springframework.web
name org.springframework.web
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel INFO
additivity < span class = "token boolean" > true< / span >
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h3 id = "view-logger-information-for-the-special-classloader" tabindex = "-1" > < a class = "header-anchor" href = "#view-logger-information-for-the-special-classloader" aria-hidden = "true" > #< / a > View logger information for the special classloader< / h3 > < p > Note that the hashcode changes, you need to check the current ClassLoader information first, and extract the hashcode corresponding to the ClassLoader.< / p > < p > if you use< code > -c< / code > , you have to manually type hashcode by < code > -c < hashcode> < / code > .< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@2062< span class = "token punctuation" > ]< / span > $ logger -c 2a139a55
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
level DEBUG
effectiveLevel DEBUG
additivity < span class = "token boolean" > true< / span >
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
< span class = "token function" > file< / span > app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
appenderRef < span class = "token punctuation" > [< / span > APPLICATION< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > For classloader with only one instance, it can be specified by < code > --classLoaderClass< / code > using class name, which is more convenient to use.< / p > < p > < code > logger --classLoaderClass sun.misc.Launcher$AppClassLoader< / code > < / p > < ul > < li > PS: Here the classLoaderClass in java 8 is sun.misc.Launcher$AppClassLoader, while in java 11 it' s jdk.internal.loader.ClassLoaders$AppClassLoader.< / li > < / ul > < p > The value of < code > --classloaderclass< / code > is the class name of classloader. It can only work when it matches a unique classloader instance. The purpose is to facilitate the input of general commands. However, < code > -c < hashcode> < / code > is dynamic.< / p > < h3 id = "update-logger-level" tabindex = "-1" > < a class = "header-anchor" href = "#update-logger-level" aria-hidden = "true" > #< / a > Update logger level< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@2062< span class = "token punctuation" > ]< / span > $ logger --name ROOT --level debug
update logger level success.
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h3 id = "speecify-classloader-to-update-logger-level" tabindex = "-1" > < a class = "header-anchor" href = "#speecify-classloader-to-update-logger-level" aria-hidden = "true" > #< / a > Speecify classloader to update logger level< / h3 > < p > By default， < code > war< / code > , or using spring boot fat jar, then it needs to specify classloader。< / p > < p > You can first use < code > sc -d yourClassName< / code > to check specified classloader hashcode， < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@2062< span class = "token punctuation" > ]< / span > $ logger -c 2a139a55 --name ROOT --level debug
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h3 id = "view-the-logger-information-without-appenders" tabindex = "-1" > < a class = "header-anchor" href = "#view-the-logger-information-without-appenders" aria-hidden = "true" > #< / a > View the logger information without appenders< / h3 > < p > By default, the < code > logger< / code > command only prints information about the logger with appenders. If you want to see information about loggers without < code > appender< / code > , you can use the parameter < code > --include-no-appender< / code > .< / p > < p > Note that the output will usually be very long.< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@2062< span class = "token punctuation" > ]< / span > $ logger --include-no-appender
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
level DEBUG
effectiveLevel DEBUG
additivity < span class = "token boolean" > true< / span >
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
< span class = "token function" > file< / span > app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
appenderRef < span class = "token punctuation" > [< / span > APPLICATION< span class = "token punctuation" > ]< / span >
name com
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel DEBUG
additivity < span class = "token boolean" > true< / span >
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
name com.alibaba
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > @2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel DEBUG
additivity < span class = "token boolean" > true< / span >
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
< span class = "token punctuation" > ..< / span > .
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < / div > <!-- [ --> <!-- ] --> < / div > < footer class = "page-meta right-menu-padding" data-v-8e2a76de > < div class = "meta-item edit-link" > < a class = "external-link meta-item-label" href = "https://github.com/alibaba/arthas/edit/master/site/docs/en/doc/logger.md" rel = "noopener noreferrer" target = "_blank" aria-label = "Edit this page on GitHub" > <!-- [ --> <!-- ] --> < span > Edit this page on GitHub< / span > < span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > open in new window< / span > < / span > <!-- [ --> <!-- ] --> < / a > < / div > < div class = "meta-item last-updated" > < span class = "meta-item-label" > Last Updated: < / span > <!-- --> < / div > < div class = "meta-item contributors" > < span class = "meta-item-label" > Contributors: < / span > < span class = "meta-item-info" > <!-- [ --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@gmail.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hollowman@hollowman.ml" > Hollow Man< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: i@fatpandac.com" > Fatpandac< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hollowman186@vip.qq.com" > Hollow Man< / span > <!-- --> <!-- ] --> <!-- ] --> < / span > < / div > < / footer > < nav class = "page-nav right-menu-padding" data-v-8e2a76de > < p class = "inner" > < span class = "prev" > < a href = "/en/doc/jvm.html" class = "" aria-label = "jvm" > <!-- [ --> <!-- ] --> jvm <!-- [ --> <!-- ] --> < / a > < / span > < span class = "next" > < a href = "/en/doc/mbean.html" class = "" aria-label = "mbean" > <!-- [ --> <!-- ] --> mbean <!-- [ --> <!-- ] --> < / a > < / span > < / p > < / nav > <!-- [ --> <!-- ] --> < / main > <!-- ] --> < / div > <!-- --> <!-- ] --> < / div >
< script type = "module" src = "/assets/app.e9adadd6.js" defer > < / script >
< / body >
< / html >
