springboot jmx

springboot可以通过实现@ManagedResource,@ManagedAttribute, or @ManagedOperation等接口，将bean暴露为MBean，开启JMX功能需要添加配置：

spring.jmx.enabled=true

对应的MBean代码如下：

import org.springframework.jmx.export.annotation.ManagedAttribute;
import org.springframework.jmx.export.annotation.ManagedOperation;
import org.springframework.jmx.export.annotation.ManagedResource;
import org.springframework.stereotype.Component;

@Component
@ManagedResource(objectName = "com.mbean.demo:name=MBeanDemo")
public class MBeanDemo {
    @ManagedAttribute
    public String getName() {
        return "MBean";
    }

    @ManagedOperation
    public void shutdown() {
        System.exit(0);
    }
}

暴露为MBean后，可以通过jconsole或者jvisualvm等工具，访问Mbean的属性或者调用方法：

如下图，可以通过jvisualvm查看mbean的属性或者调用shutdown方法等

springboot可以通过集成jolokia来使用HTTP形式访问mbean

在pom.xml中添加依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jolokia</groupId>
            <artifactId>jolokia-core</artifactId>
        </dependency>

添加配置：

management.endpoint.jolokia.enabled=true
management.endpoints.web.exposure.include=*

通过访问http://localhost:8080/actuator/jolokia可以看到如下类似数据，即说明集成成功

{
  "request": {
    "type": "version"
  },
  "value": {
    "agent": "1.6.2",
    "protocol": "7.2",
    "config": {
      "listenForHttpService": "true",
      "authIgnoreCerts": "false",
      "agentId": "10.0.75.1-9200-5c9f0ca8-servlet",
      "debug": "false",
      "agentType": "servlet",
      "policyLocation": "classpath:\/jolokia-access.xml",
      "agentContext": "\/jolokia",
      "serializeException": "false",
      "mimeType": "text\/plain",
      "dispatcherClasses": "org.jolokia.http.Jsr160ProxyNotEnabledByDefaultAnymoreDispatcher",
      "authMode": "basic",
      "authMatch": "any",
      "streaming": "true",
      "canonicalNaming": "true",
      "historyMaxEntries": "10",
      "allowErrorDetails": "true",
      "allowDnsReverseLookup": "true",
      "realm": "jolokia",
      "includeStackTrace": "true",
      "useRestrictorService": "false",
      "debugMaxEntries": "100"
    },
    "info": {}
  },
  "timestamp": 1587714368,
  "status": 200
}

访问http://localhost:8080/actuator/jolokia/read/com.mbean.demo:name=MBeanDemo可以看到对应MBean的属性

{"request":{"mbean":"com.mbean.demo:name=MBeanDemo","type":"read"},"value":{"Name":"MBean"},"timestamp":1587714460,"status":200}

更多关于jolokia的使用可以参考官网：

Jolokia Protocol