Timestamp of restart of spring application-CodePudding

I have a microservice based on spring boot. I have a spring cloud configserver as well in-place. So depending upon the changes in the configserver microservice restart automatically.
So now i need to grab the timestamp when the application got restarted.
Is it possible to do so in the same microservice?

CodePudding user response：

You can listen to spring events such as the ContextStartedEvent. There's a tutorial here that lays it out:

@EventListener
public void handleContextStartedEvent(ContextStartedEvent ctxStartEvt) {
    System.out.println("Context Start Event received.");
}

CodePudding user response：

yes, possible by adding the actuator and enabling the startup endpoint.

step1: Add the below dependency

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
        <version>2.5.4</version>
    </dependency>

step2: Add the below property into the application.properties files.

management.endpoints.web.exposure.include=startup

step3: Setup a little amount of buffer memory to store the startup info and it won't affect the performance at anywhere in your application.

@SpringBootApplication
public class StartupTrackingApplication {

    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(StartupTrackingApplication.class);
        app.setApplicationStartup(new BufferingApplicationStartup(2048));
        app.run(args);
    }
}

step: Hit the below URL using CURL like below or a POST call from POSTMAN. Then you will be seeing all startup-related info like when the startup started and ended. e.t.c.

curl 'http://localhost:8080/actuator/startup' -X POST | jq

For more explanation, view reference

In the response json, node "timeline"."startTime" is the exact startup timestamp when the applicant has started its startup job.