Get Spring context tutorial (#1342)

tutorials/katacoda/case-get-spring-context-cn/arthas-boot.md

@@ -0,0 +1,16 @@
+
+
+
+
+在新的`Terminal 2`里，下载`arthas-boot.jar`，再用`java -jar`命令启动：
+
+`wget https://alibaba.github.io/arthas/arthas-boot.jar
+java -jar arthas-boot.jar`{{execute T2}}
+
+`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。
+
+选择第一个进程，输入 `1`{{execute T2}} ，再`Enter/回车`：
+
+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。
+
+![Arthas Boot](/arthas/scenarios/common-resources/assets/arthas-boot.png)

tutorials/katacoda/case-get-spring-context-cn/case-get-spring-context.md

@@ -0,0 +1,54 @@
+
+
+在这个案例里，展示获取spring context，再获取bean，然后调用函数。
+
+### 使用tt命令获取到spring context
+
+`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。
+
+* https://alibaba.github.io/arthas/tt.html
+
+`tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter invokeHandlerMethod`{{execute T2}}
+
+访问：https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/1
+
+可以看到`tt`命令捕获到了一个请求：
+
+```bash
+$ tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdaptePress Q or Ctrl+C to abort.
+Affect(class-cnt:1 , method-cnt:1) cost in 252 ms.
+ INDE  TIMESTAMP    COST(  IS-R  IS-  OBJECT     CLASS               METHOD
+ X                  ms)    ET    EXP
+-----------------------------------------------------------------------------------------
+ 1000  2019-02-15   4.583  true  fal  0xc93cf1a  RequestMappingHand  invokeHandlerMethod
+       15:38:32     923          se              lerAdapter
+```
+
+### 使用tt命令从调用记录里获取到spring context
+
+输入 `Q`{{execute T2}} 或者 `Ctrl + C` 退出上面的 `tt -t`命令。
+
+`tt -i 1000 -w 'target.getApplicationContext()'`{{execute T2}}
+
+```bash
+$ tt -i 1000 -w 'target.getApplicationContext()'
+@AnnotationConfigEmbeddedWebApplicationContext[
+    reader=@AnnotatedBeanDefinitionReader[org.springframework.context.annotation.AnnotatedBeanDefinitionReader@2e457641],
+    scanner=@ClassPathBeanDefinitionScanner[org.springframework.context.annotation.ClassPathBeanDefinitionScanner@6eb38026],
+    annotatedClasses=null,
+    basePackages=null,
+]
+Affect(row-cnt:1) cost in 439 ms.
+```
+
+## 获取spring bean，并调用函数
+
+`tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'`{{execute T2}}
+
+结果是：
+
+```bash
+$ tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'
+@String[Hello World]
+Affect(row-cnt:1) cost in 52 ms.
+```

tutorials/katacoda/case-get-spring-context-cn/finish.md

@@ -0,0 +1,10 @@
+
+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。
+
+* [Arthas进阶](https://alibaba.github.io/arthas/arthas-tutorials?language=cn&id=arthas-advanced)
+* [Arthas Github](https://github.com/alibaba/arthas)
+* [Arthas 文档](https://alibaba.github.io/arthas/)
+
+欢迎关注公众号，获取Arthas项目的信息，源码分析，案例实践。
+
+![Arthas公众号](/arthas/scenarios/common-resources/assets/qrcode_gongzhonghao.jpg)

tutorials/katacoda/case-get-spring-context-cn/index.json

@@ -0,0 +1,45 @@
+{
+  "title": "Arthas 获取Spring Context 案例",
+  "description": "Arthas 获取Spring Context 案例",
+  "difficulty": "高级使用者",
+  "time": "10分钟",
+  "details": {
+    "steps": [
+      {
+        "title": "Start demo",
+        "text": "start-demo.md"
+      },
+      {
+        "title": "Start arthas-boot",
+        "text": "arthas-boot.md"
+      },
+      {
+        "title": "获取Spring Context",
+        "text": "case-get-spring-context.md"
+      }
+    ],
+    "intro": {
+      "text": "intro.md"
+    },
+    "finish": {
+      "text": "finish.md"
+    },
+    "assets": {
+      "host01": []
+    }
+  },
+  "environment": {
+    "uilayout": "terminal",
+    "showdashboard": true,
+    "dashboards": [
+      {
+        "name": "Web Port 80",
+        "port": 80
+      }
+    ]
+  },
+  "backend": {
+    "imageid": "java",
+    "environmentsprotocol": "http"
+  }
+}

tutorials/katacoda/case-get-spring-context-cn/intro.md

@@ -0,0 +1,11 @@
+
+
+
+![Arthas](https://alibaba.github.io/arthas/_images/arthas.png)
+
+`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。
+
+`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。
+
+* Github: https://github.com/alibaba/arthas
+* 文档: https://alibaba.github.io/arthas/

tutorials/katacoda/case-get-spring-context-cn/start-demo.md

@@ -0,0 +1,14 @@
+
+
+
+
+下载`demo-arthas-spring-boot.jar`，再用`java -jar`命令启动：
+
+`wget https://github.com/hengyunabc/spring-boot-inside/raw/master/demo-arthas-spring-boot/demo-arthas-spring-boot.jar
+java -jar demo-arthas-spring-boot.jar`{{execute T1}}
+
+`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)
+
+启动之后，可以访问80端口： https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com
+
+![Demo Web](/arthas/scenarios/common-resources/assets/demo-web.png)

tutorials/katacoda/case-get-spring-context-en/arthas-boot.md

@@ -0,0 +1,16 @@
+
+
+
+
+In the new `Terminal 2`, download `arthas-boot.jar` and start with the `java -jar` command:
+
+`wget https://alibaba.github.io/arthas/arthas-boot.jar
+java -jar arthas-boot.jar`{{execute T2}}
+
+`arthas-boot` is the launcher for `Arthas`. It lists all the Java processes, and the user can select the target process to be diagnosed.
+
+Select the first process, type `1`{{execute T2}} ，then type `Enter`：
+
+After the Attach is successful, Arthas LOGO is printed. Enter `help`{{execute T2}} for more help.
+
+![Arthas Boot](/arthas/scenarios/common-resources/assets/arthas-boot.png)

tutorials/katacoda/case-get-spring-context-en/case-get-spring-context.md

@@ -0,0 +1,54 @@
+
+
+In this case, the user can get the spring context, get the bean, and invoke the method.
+
+### Use the tt command to record the invocation of the specified method
+
+`tt` is TimeTunnel, which records the parameters and return value of each invocation of the specified method.
+
+* https://alibaba.github.io/arthas/tt.html
+
+`tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter invokeHandlerMethod`{{execute T2}}
+
+Visit: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/user/1
+
+You can see that the `tt` command record an invocation:
+
+```bash
+$ tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdaptePress Q or Ctrl+C to abort.
+Affect(class-cnt:1 , method-cnt:1) cost in 252 ms.
+ INDE  TIMESTAMP    COST(  IS-R  IS-  OBJECT     CLASS               METHOD
+ X                  ms)    ET    EXP
+-----------------------------------------------------------------------------------------
+ 1000  2019-02-15   4.583  true  fal  0xc93cf1a  RequestMappingHand  invokeHandlerMethod
+       15:38:32     923          se              lerAdapter
+```
+
+### Use the tt command to get the spring context from the invocation record.
+
+Type `Q`{{execute T2}} or `Ctrl + C` to exit the `tt -t` command above.
+
+`tt -i 1000 -w 'target.getApplicationContext()'`{{execute T2}}
+
+```bash
+$ tt -i 1000 -w 'target.getApplicationContext()'
+@AnnotationConfigEmbeddedWebApplicationContext[
+    reader=@AnnotatedBeanDefinitionReader[org.springframework.context.annotation.AnnotatedBeanDefinitionReader@2e457641],
+    scanner=@ClassPathBeanDefinitionScanner[org.springframework.context.annotation.ClassPathBeanDefinitionScanner@6eb38026],
+    annotatedClasses=null,
+    basePackages=null,
+]
+Affect(row-cnt:1) cost in 439 ms.
+```
+
+## Get the spring bean and invoke method
+
+`tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'`{{execute T2}}
+
+The result is:
+
+```bash
+$ tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'
+@String[Hello World]
+Affect(row-cnt:1) cost in 52 ms.
+```

tutorials/katacoda/case-get-spring-context-en/finish.md

@@ -0,0 +1,6 @@
+
+Through this tutorial, you can know how to Get the Spring Context. More advanced features can be found in the Advanced Guide below.
+
+* [Arthas Advanced](https://alibaba.github.io/arthas/arthas-tutorials?language=en&id=arthas-advanced)
+* [Arthas Github](https://github.com/alibaba/arthas)
+* [Arthas Documentation](https://alibaba.github.io/arthas/en)

tutorials/katacoda/case-get-spring-context-en/index.json

@@ -0,0 +1,45 @@
+{
+  "title": "Arthas Get the Spring Context",
+  "description": "Arthas Get the Spring Context",
+  "difficulty": "expert",
+  "time": "10 minutes",
+  "details": {
+    "steps": [
+      {
+        "title": "Start demo",
+        "text": "start-demo.md"
+      },
+      {
+        "title": "Start arthas-boot",
+        "text": "arthas-boot.md"
+      },
+      {
+        "title": "Get the Spring Context",
+        "text": "case-get-spring-context.md"
+      }  
+    ],
+    "intro": {
+      "text": "intro.md"
+    },
+    "finish": {
+      "text": "finish.md"
+    },
+    "assets": {
+      "host01": []
+    }
+  },
+  "environment": {
+    "uilayout": "terminal",
+    "showdashboard": true,
+    "dashboards": [
+      {
+        "name": "Web Port 80",
+        "port": 80
+      }
+    ]
+  },
+  "backend": {
+    "imageid": "java",
+    "environmentsprotocol": "http"
+  }
+}

tutorials/katacoda/case-get-spring-context-en/intro.md

@@ -0,0 +1,11 @@
+
+
+
+![Arthas](https://alibaba.github.io/arthas/_images/arthas.png)
+
+`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.
+
+`Arthas` supports JDK 6+, supports Linux/Mac/Windows.
+
+* Github: https://github.com/alibaba/arthas
+* Documentation: https://alibaba.github.io/arthas/en

tutorials/katacoda/case-get-spring-context-en/start-demo.md

@@ -0,0 +1,14 @@
+
+
+
+
+Download `demo-arthas-spring-boot.jar`, and start with `java -jar` command:
+
+`wget https://github.com/hengyunabc/spring-boot-inside/raw/master/demo-arthas-spring-boot/demo-arthas-spring-boot.jar
+java -jar demo-arthas-spring-boot.jar`{{execute T1}}
+
+`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)
+
+After booting, access port 80: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com
+
+![Demo Web](/arthas/scenarios/common-resources/assets/demo-web.png)