mirror of
https://github.com/alibaba/arthas.git
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Get Spring context tutorial (#1342)
This commit is contained in:
Hollow Man
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在新的`Terminal 2`里，下载`arthas-boot.jar`，再用`java -jar`命令启动：
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`wget https://alibaba.github.io/arthas/arthas-boot.jar
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java -jar arthas-boot.jar`{{execute T2}}
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`arthas-boot`是`Arthas`的启动程序，它启动后，会列出所有的Java进程，用户可以选择需要诊断的目标进程。
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选择第一个进程，输入 `1`{{execute T2}} ，再`Enter/回车`：
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Attach成功之后，会打印Arthas LOGO。输入 `help`{{execute T2}} 可以获取到更多的帮助信息。
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在这个案例里，展示获取spring context，再获取bean，然后调用函数。
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### 使用tt命令获取到spring context
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`tt`即 TimeTunnel，它可以记录下指定方法每次调用的入参和返回信息，并能对这些不同的时间下调用进行观测。
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* https://alibaba.github.io/arthas/tt.html
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`tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter invokeHandlerMethod`{{execute T2}}
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访问：https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/1
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可以看到`tt`命令捕获到了一个请求：
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```bash
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$ tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdaptePress Q or Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 252 ms.
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INDE TIMESTAMP COST( IS-R IS- OBJECT CLASS METHOD
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X ms) ET EXP
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-----------------------------------------------------------------------------------------
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1000 2019-02-15 4.583 true fal 0xc93cf1a RequestMappingHand invokeHandlerMethod
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15:38:32 923 se lerAdapter
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```
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### 使用tt命令从调用记录里获取到spring context
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输入 `Q`{{execute T2}} 或者 `Ctrl + C` 退出上面的 `tt -t`命令。
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`tt -i 1000 -w 'target.getApplicationContext()'`{{execute T2}}
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```bash
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$ tt -i 1000 -w 'target.getApplicationContext()'
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@AnnotationConfigEmbeddedWebApplicationContext[
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reader=@AnnotatedBeanDefinitionReader[org.springframework.context.annotation.AnnotatedBeanDefinitionReader@2e457641],
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scanner=@ClassPathBeanDefinitionScanner[org.springframework.context.annotation.ClassPathBeanDefinitionScanner@6eb38026],
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annotatedClasses=null,
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basePackages=null,
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]
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Affect(row-cnt:1) cost in 439 ms.
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```
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## 获取spring bean，并调用函数
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`tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'`{{execute T2}}
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结果是：
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```bash
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$ tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'
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@String[Hello World]
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Affect(row-cnt:1) cost in 52 ms.
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```
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通过本教程基本掌握了Arthas获取Spring Context。更多高级特性，可以在下面的进阶指南里继续了解。
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* [Arthas进阶](https://alibaba.github.io/arthas/arthas-tutorials?language=cn&id=arthas-advanced)
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* [Arthas Github](https://github.com/alibaba/arthas)
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* [Arthas 文档](https://alibaba.github.io/arthas/)
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欢迎关注公众号，获取Arthas项目的信息，源码分析，案例实践。
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{
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"title": "Arthas 获取Spring Context 案例",
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"description": "Arthas 获取Spring Context 案例",
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"difficulty": "高级使用者",
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"time": "10分钟",
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"details": {
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"steps": [
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{
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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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"text": "arthas-boot.md"
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},
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{
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"title": "获取Spring Context",
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"text": "case-get-spring-context.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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"assets": {
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"host01": []
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}
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},
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"environment": {
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"uilayout": "terminal",
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"showdashboard": true,
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"dashboards": [
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{
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"name": "Web Port 80",
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"port": 80
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}
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]
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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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`Arthas` 是Alibaba开源的Java诊断工具，深受开发者喜爱。在线排查问题，无需重启；动态跟踪Java代码；实时监控JVM状态。
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`Arthas` 支持JDK 6+，支持Linux/Mac/Windows，采用命令行交互模式，同时提供丰富的 `Tab` 自动补全功能，进一步方便进行问题的定位和诊断。
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* Github: https://github.com/alibaba/arthas
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* 文档: https://alibaba.github.io/arthas/
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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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@@ -0,0 +1,16 @@
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In the new `Terminal 2`, download `arthas-boot.jar` and start with the `java -jar` command:
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`wget https://alibaba.github.io/arthas/arthas-boot.jar
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java -jar arthas-boot.jar`{{execute T2}}
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`arthas-boot` is the launcher for `Arthas`. It lists all the Java processes, and the user can select the target process to be diagnosed.
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Select the first process, type `1`{{execute T2}} ，then type `Enter`：
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After the Attach is successful, Arthas LOGO is printed. Enter `help`{{execute T2}} for more help.
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@@ -0,0 +1,54 @@
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In this case, the user can get the spring context, get the bean, and invoke the method.
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### Use the tt command to record the invocation of the specified method
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`tt` is TimeTunnel, which records the parameters and return value of each invocation of the specified method.
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* https://alibaba.github.io/arthas/tt.html
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`tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter invokeHandlerMethod`{{execute T2}}
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Visit: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/1
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You can see that the `tt` command record an invocation:
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```bash
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$ tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdaptePress Q or Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 252 ms.
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INDE TIMESTAMP COST( IS-R IS- OBJECT CLASS METHOD
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X ms) ET EXP
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-----------------------------------------------------------------------------------------
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1000 2019-02-15 4.583 true fal 0xc93cf1a RequestMappingHand invokeHandlerMethod
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15:38:32 923 se lerAdapter
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```
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### Use the tt command to get the spring context from the invocation record.
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Type `Q`{{execute T2}} or `Ctrl + C` to exit the `tt -t` command above.
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`tt -i 1000 -w 'target.getApplicationContext()'`{{execute T2}}
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```bash
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$ tt -i 1000 -w 'target.getApplicationContext()'
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@AnnotationConfigEmbeddedWebApplicationContext[
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reader=@AnnotatedBeanDefinitionReader[org.springframework.context.annotation.AnnotatedBeanDefinitionReader@2e457641],
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scanner=@ClassPathBeanDefinitionScanner[org.springframework.context.annotation.ClassPathBeanDefinitionScanner@6eb38026],
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annotatedClasses=null,
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basePackages=null,
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]
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Affect(row-cnt:1) cost in 439 ms.
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```
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## Get the spring bean and invoke method
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`tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'`{{execute T2}}
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The result is:
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```bash
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$ tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'
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@String[Hello World]
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Affect(row-cnt:1) cost in 52 ms.
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```
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@@ -0,0 +1,6 @@
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Through this tutorial, you can know how to Get the Spring Context. More advanced features can be found in the Advanced Guide below.
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* [Arthas Advanced](https://alibaba.github.io/arthas/arthas-tutorials?language=en&id=arthas-advanced)
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* [Arthas Github](https://github.com/alibaba/arthas)
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* [Arthas Documentation](https://alibaba.github.io/arthas/en)
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@@ -0,0 +1,45 @@
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{
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"title": "Arthas Get the Spring Context",
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"description": "Arthas Get the Spring Context",
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"difficulty": "expert",
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"time": "10 minutes",
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"details": {
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"steps": [
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{
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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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"text": "arthas-boot.md"
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},
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{
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"title": "Get the Spring Context",
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"text": "case-get-spring-context.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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"assets": {
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"host01": []
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}
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},
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"environment": {
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"uilayout": "terminal",
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"showdashboard": true,
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"dashboards": [
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{
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"name": "Web Port 80",
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"port": 80
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}
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]
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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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@@ -0,0 +1,11 @@
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`Arthas` is a Java diagnostic tool open-sourced by Alibaba middleware team. Arthas helps developers in trouble-shooting issues in production environment for Java based applications without modifying code or restarting servers.
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`Arthas` supports JDK 6+, supports Linux/Mac/Windows.
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* Github: https://github.com/alibaba/arthas
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* Documentation: https://alibaba.github.io/arthas/en
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@@ -0,0 +1,14 @@
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Download `demo-arthas-spring-boot.jar`, and start with `java -jar` command:
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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` is a simple Spring Boot demo, the source code here: [View](https://github.com/hengyunabc/spring-boot-inside/tree/master/demo-arthas-spring-boot)
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After booting, access port 80: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com
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Reference in New Issue
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