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下面使用`vmtool`命令查找spring里的对象。
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### 查找spring context
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```bash
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$ vmtool --action getInstances --className org.springframework.context.ApplicationContext
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@ApplicationContext[][
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@AnnotationConfigEmbeddedWebApplicationContext[org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@12028586: startup date [Thu May 13 16:08:38 UTC 2021]; root of context hierarchy],
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]
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```
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### 指定返回结果展开层数
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> `getInstances` action返回结果绑定到`instances`变量上，它是数组。
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> 通过 `-x`/`--expand` 参数可以指定结果的展开层次，默认值是1。
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```bash
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vmtool --action getInstances -c 19469ea2 --className org.springframework.context.ApplicationContext -x 2
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```
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### 执行表达式
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> `getInstances` action返回结果绑定到`instances`变量上，它是数组。可以通过`--express`参数执行指定的表达式。
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查找所有的spring beans名字：
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```bash
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vmtool --action getInstances --className org.springframework.context.ApplicationContext --express 'instances[0].getBeanDefinitionNames()'
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```
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调用`userController.findUserById(1)`函数：
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```
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$ vmtool --action getInstances --className org.springframework.context.ApplicationContext --express 'instances[0].getBean("userController").findUserById(1)'
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@User[
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id=@Integer[1],
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name=@String[name1],
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]
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```
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### 查找所有的spring mapping对象
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```bash
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$ vmtool --action getInstances --className org.springframework.web.servlet.HandlerMapping
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@HandlerMapping[][
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@SimpleUrlHandlerMapping[org.springframework.web.servlet.handler.SimpleUrlHandlerMapping@5d3819c8],
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@EmptyHandlerMapping[org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport$EmptyHandlerMapping@11d509ba],
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@RequestMappingHandlerMapping[org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping@56a5f2e3],
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@WelcomePageHandlerMapping[org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WelcomePageHandlerMapping@4c0a4ed3],
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@EmptyHandlerMapping[org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport$EmptyHandlerMapping@51e1f8c3],
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@BeanNameUrlHandlerMapping[org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping@68c0a39c],
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@SimpleUrlHandlerMapping[org.springframework.web.servlet.handler.SimpleUrlHandlerMapping@110b768d],
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]
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```
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