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55 lines
2.1 KiB
Markdown
55 lines
2.1 KiB
Markdown
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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://arthas.aliyun.com/doc/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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