mirror of https://github.com/alibaba/arthas.git
Hollow Man
5 years ago
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GitHub
parent
35aa6cf686
commit
2e979ff35f
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下载`arthas-demo.jar`，再用`java -jar`命令启动：
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`wget https://arthas.aliyun.com/doc/arthas-demo.jar
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java -jar arthas-demo.jar`{{execute T1}}
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`arthas-demo`是一个很简单的程序，它随机生成整数，再执行因式分解，把结果打印出来。如果生成的随机数是负数，则会打印提示信息。
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{
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"title": "Arthas sc命令",
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"description": "Arthas sc命令",
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"difficulty": "精通者",
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"time": "10-20 分钟",
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"details": {
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"steps": [
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{
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"title": "启动arthas demo",
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"text": "arthas-demo.md"
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},
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{
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"title": "启动arthas-boot",
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"text": "arthas-boot.md"
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},
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{
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"title": "sc命令",
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"text": "sc.md"
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}
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],
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"intro": {
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"text": "intro.md"
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},
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"finish": {
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"text": "finish.md"
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}
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},
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"environment": {
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"uilayout": "terminal"
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},
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"backend": {
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"imageid": "java",
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"environmentsprotocol": "http"
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}
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}
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Download `arthas-demo.jar` and start with the `java -jar` command:
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`wget https://arthas.aliyun.com/doc/arthas-demo.jar
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java -jar arthas-demo.jar`{{execute T1}}
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`arthas-demo` is a very simple program that randomly generates integers, performs factorization, and prints the results.
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If the generated random number is negative, a error message will be printed.
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The `sc Tutorial` demonstrates the usage of sc. If you have more tips or questions, please feel free to ask in Issue.
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* Issues: https://github.com/alibaba/arthas/issues
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* Documentation: https://arthas.aliyun.com/doc/en
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If you are using Arthas, please let us know. Your use is very important to us: [View](https://github.com/alibaba/arthas/issues/111)
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{
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"title": "Arthas sc Command",
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"description": "Arthas sc Command",
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"difficulty": "master",
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"time": "10-20 minutes",
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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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},
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{
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"title": "Start arthas-boot",
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"text": "arthas-boot.md"
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},
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{
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"title": "sc Command",
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"text": "sc.md"
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}
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],
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"intro": {
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"text": "intro.md"
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},
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"finish": {
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"text": "finish.md"
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}
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},
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"environment": {
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"uilayout": "terminal"
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},
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"backend": {
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"imageid": "java",
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"environmentsprotocol": "http"
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}
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}
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> Search classes loaded by JVM.
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`sc` stands for search class. This command can search all possible classes loaded by JVM and show their information. The supported options are: `[d]`、`[E]`、`[f]` and `[x:]`.
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### Supported Options
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|Name|Specification|
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|---:|:---|
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|*class-pattern*|pattern for the class name|
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|*method-pattern*|pattern for the method name|
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|`[d]`|print the details of the current class, including its code source, class specification, its class loader and so on.<br/>If a class is loaded by more than one class loader, then the class details will be printed several times|
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|`[E]`|turn on regex match, the default behavior is wildcards match|
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|`[f]`|print the fields info of the current class, MUST be used with `-d` together|
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|`[x:]`|specify the depth of recursive traverse the static fields, the default value is '0' - equivalent to use `toString` to output|
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|`[c:]`|The hash code of the special class's classLoader|
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|`[n:]`|Maximum number of matching classes with details (100 by default)|
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> *class-patten* supports full qualified class name, e.g. com.taobao.test.AAA and com/taobao/test/AAA. It also supports the format of 'com/taobao/test/AAA', so that it is convenient to directly copy class name from the exception stack trace without replacing '/' to '.'. <br/><br/>
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> `sc` turns on matching sub-class match by default, that is, `sc` will also search the sub classes of the target class too. If exact-match is desired, pls. use `options disable-sub-class true`.
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### Usage
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* Wildcards match search
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`sc demo.*`{{execute T2}}
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```bash
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$ sc demo.*
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demo.MathGame
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Affect(row-cnt:1) cost in 55 ms.
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```
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* View class details
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`sc -d demo.MathGame`{{execute T2}}
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```bash
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$ sc -d demo.MathGame
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class-info demo.MathGame
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code-source /private/tmp/arthas-demo.jar
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name demo.MathGame
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isInterface false
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isAnnotation false
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isEnum false
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isAnonymousClass false
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isArray false
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isLocalClass false
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isMemberClass false
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isPrimitive false
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isSynthetic false
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simple-name MathGame
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modifier public
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annotation
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interfaces
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super-class +-java.lang.Object
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class-loader +-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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classLoaderHash 3d4eac69
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Affect(row-cnt:1) cost in 875 ms.
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```
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Take a note of the classLoaderHash here:`3d4eac69`, and use it to replace `<classLoaderHash>` and execute the following command.
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* Specify classLoader
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`sc -c <classLoaderHash> -d demo*`
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* View class fields
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`sc -d -f demo.MathGame`{{execute T2}}
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```bash
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$ sc -d -f demo.MathGame
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class-info demo.MathGame
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code-source /private/tmp/arthas-demo.jar
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name demo.MathGame
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isInterface false
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isAnnotation false
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isEnum false
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isAnonymousClass false
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isArray false
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isLocalClass false
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isMemberClass false
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isPrimitive false
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isSynthetic false
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simple-name MathGame
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modifier public
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annotation
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interfaces
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super-class +-java.lang.Object
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class-loader +-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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classLoaderHash 3d4eac69
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fields modifierprivate,static
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type java.util.Random
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name random
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value java.util.Random@522b4
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08a
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modifierprivate
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type int
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name illegalArgumentCount
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Affect(row-cnt:1) cost in 19 ms.
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```
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