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Fix typos and accessibility alibaba#847 (alibaba#1460)
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‎README_CN.md‎

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@@ -30,7 +30,7 @@ English version goes [here](README.md).
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### [在线教程(推荐)](https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn)
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* [Usages](tutorials/katacoda/README_CN.md#在线教程使用方法)
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* [使用方法](tutorials/katacoda/README_CN.md#在线教程使用方法)
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### 快速开始
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‎tutorials/katacoda/arthas-advanced-cn/case-classloader.md‎

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比如上面查看到的spring LaunchedURLClassLoader的 hashcode是`1be6f5c3`，可以通过`-c`或者`--classLoaderClass`参数来列出它的所有urls：
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader`
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader`{{execute T2}}
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```
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$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader
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### 加载指定ClassLoader里的资源文件
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查找指定的资源文件： `classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml`
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查找指定的资源文件： `classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml`{{execute T2}}
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```
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$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml
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比如用上面的spring LaunchedURLClassLoader 尝试加载 `java.lang.String` ：
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String`
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String`{{execute T2}}
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```
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$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String

‎tutorials/katacoda/arthas-advanced-en/case-classloader.md‎

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For example, the hashcode of spring `LaunchedURLClassLoader` viewed above is `1be6f5c3`, and all its urls can be listed by the `-c` parameter:
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader`
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader`{{execute T2}}
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```
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$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader
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### Load the resource file in the specified ClassLoader
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Load the specified resource file: `classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml`
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Load the specified resource file: `classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml`{{execute T2}}
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```
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$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml
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For example, try loading `java.lang.String` with spring LaunchedURLClassLoader :
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String`
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`classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String`{{execute T2}}
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```
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$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String

‎tutorials/katacoda/case-classloader-cn/start-demo.md‎

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下载`demo-arthas-spring-boot.jar`，再用`java -jar`命令启动：
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`wget https://github.com/hengyunabc/spring-boot-inside/raw/master/demo-arthas-spring-boot/demo-arthas-spring-boot.jar
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java -jar demo-arthas-spring-boot.jar`{{execute T1}}
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`demo-arthas-spring-boot`是一个很简单的spring boot应用，源代码：[查看](https://github.com/hengyunabc/spring-boot-inside/tree/master/demo-arthas-spring-boot)
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启动之后，可以访问80端口： https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com
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![Demo Web](/arthas/scenarios/common-resources/assets/demo-web.png)

‎tutorials/katacoda/command-help-cn/help.md‎

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trace Trace the execution time of specified method invocation.
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watch Display the input/output parameter, return object, and thrown exception of specified method invocation
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...
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```
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```

‎tutorials/katacoda/command-help-en/help.md‎

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trace Trace the execution time of specified method invocation.
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watch Display the input/output parameter, return object, and thrown exception of specified method invocation
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...
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```
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```

‎tutorials/katacoda/command-help-en/index.json‎

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{
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"title": "Arthas Basics",
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"description": "Arthas Basics",
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"title": "Arthas Help Command",
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"description": "Arthas Help Command",
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"details": {
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"steps": [
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{

‎tutorials/katacoda/command-logger-cn/logger.md‎

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```bash
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[arthas@2062]$ logger
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level INFO
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effectiveLevel INFO
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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file app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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appenderRef [APPLICATION]
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader org.springframework.boot.loader.LaunchedURLClassLoader@5674cd4d
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classLoaderHash 5674cd4d
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level INFO
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effectiveLevel INFO
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additivity true
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codeSource jar:file:/home/scrapbook/tutorial/demo-arthas-spring-boot.jar!/BOOT-INF/lib/logback-classi
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c-1.1.11.jar!/
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader org.springframework.boot.loader.LaunchedURLClassLoader@5674cd4d
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classLoaderHash 5674cd4d
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target System.out
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...
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```
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```bash
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[arthas@2062]$ logger -n org.springframework.web
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name org.springframework.web
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel INFO
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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name org.springframework.web
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class ch.qos.logback.classic.Logger
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classLoader org.springframework.boot.loader.LaunchedURLClassLoader@5674cd4d
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classLoaderHash 5674cd4d
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level null
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effectiveLevel INFO
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additivity true
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codeSource jar:file:/home/scrapbook/tutorial/demo-arthas-spring-boot.jar!/BOOT-INF/lib/logback-classi
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c-1.1.11.jar!/
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请记下你的classLoaderHash，后面需要使用它。在这里，它是 `2a139a55`。
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请记下你的classLoaderHash，后面需要使用它。在这里，它是 `5674cd4d`。
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注意：请使用你的classLoaderHash值覆盖 `<classLoaderHash>` ，然后手动执行下面所述命令：
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如果你使用`-c`，你需要手动输入hashcode：`-c <hashcode>`
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```bash
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$ logger -c 2a139a55
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$ logger -c 5674cd4d
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```
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对于只有唯一实例的ClassLoader可以通过`--classLoaderClass`指定class name，使用起来更加方便：
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`logger --classLoaderClass sun.misc.Launcher$AppClassLoader`{{execute T2}}
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`logger --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader`{{execute T2}}
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```bash
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[arthas@2062]$ logger --classLoaderClass sun.misc.Launcher$AppClassLoader
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level DEBUG
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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file app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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appenderRef [APPLICATION]
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[arthas@2062]$ logger --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader org.springframework.boot.loader.LaunchedURLClassLoader@5674cd4d
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classLoaderHash 5674cd4d
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level INFO
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effectiveLevel INFO
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additivity true
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codeSource jar:file:/home/scrapbook/tutorial/demo-arthas-spring-boot.jar!/BOOT-INF/lib/logback-classi
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c-1.1.11.jar!/
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader org.springframework.boot.loader.LaunchedURLClassLoader@5674cd4d
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classLoaderHash 5674cd4d
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target System.out
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...
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* 注: 这里classLoaderClass 在 java 8 是 sun.misc.Launcher$AppClassLoader，而java 11的classloader是jdk.internal.loader.ClassLoaders$AppClassLoader，katacoda目前环境是java8。
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`--classLoaderClass` 的值是ClassLoader的类名，只有匹配到唯一的ClassLoader实例时才能工作，目的是方便输入通用命令，而`-c <hashcode>`是动态变化的。
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#### 更新logger level
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update logger level success.
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注意：在教程中执行会提示错误，需要指定classloader
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默认情况下，logger命令会在SystemClassloader下执行，如果应用是传统的`war`应用，或者spring boot fat jar启动的应用，那么需要指定classloader。
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可以先用 `sc -d yourClassName` 来查看具体的 classloader hashcode，然后在更新level时指定classloader：
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`logger --classLoaderClass sun.misc.Launcher$AppClassLoader --name ROOT --level debug`{{execute T2}}
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`logger --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --name ROOT --level debug`{{execute T2}}
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```bash
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[arthas@2062]$ logger --classLoaderClass sun.misc.Launcher$AppClassLoader --name ROOT --level debug
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[arthas@2062]$ logger --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --name ROOT --level debug
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```bash
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level DEBUG
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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file app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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appenderRef [APPLICATION]
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name com
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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name com.alibaba
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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name org.thymeleaf
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class ch.qos.logback.classic.Logger
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classLoader org.springframework.boot.loader.LaunchedURLClassLoader@5674cd4d
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classLoaderHash 5674cd4d
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level null
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effectiveLevel INFO
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additivity false
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codeSource jar:file:/home/scrapbook/tutorial/demo-arthas-spring-boot.jar!/BOOT-INF/lib/logback-classi
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c-1.1.11.jar!/
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appenders name DEBUG_LEVEL_REMAPPER
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class org.springframework.boot.logging.logback.LevelRemappingAppender
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classLoader org.springframework.boot.loader.LaunchedURLClassLoader@5674cd4d
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classLoaderHash 5674cd4d
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...
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```

‎tutorials/katacoda/command-logger-en/arthas-demo.md‎

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‎tutorials/katacoda/command-logger-en/index.json‎

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"details": {
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"steps": [
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{
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"title": "Arthas demo",
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"text": "arthas-demo.md"
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"title": "Start demo",
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"text": "start-demo.md"
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},
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{
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"title": "Start arthas-boot",

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