CODEWITHSUNDEEP
javaspringspring-boot
George
George

Reputation: 3030

Spring boot Auto Restart Self After JAR Update

I have a Spring Boot JAR on a linux server located at some directory /dev/ExampleApplication.jar.

Is it possible for the Spring Boot application to monitor that specific JAR for an update (maybe a change in the checksum), and if there is an update, shut itself down, and start the updated JAR?

I want something like this in pseudo code:

@Scheduled(fixedDelay = 1000)
public void checkForUpdates() {
  long fileChecksum = getJarChecksum();
  if (checksum != fileChecksum) {
    command("java -jar /dev/ExampleApplication.jar");
    context.shutdown();
  }
}

Upvotes: 1

Views: 1270

Answers (1)

RaceYouAnytime
RaceYouAnytime

Reputation: 734

You could use inotify-tools to re-launch the jar file any time it is deleted or altered.

You'll need to install inotify-tools on your Linux distro if it is not already.

while inotifywait -e close_write /dev/ExampleApplication.jar; do java -jar /dev/ExampleApplication.jar; done

The -e parameter takes an event type. You can also watch a directory to see if anything is deleted or created in that directory. See here for more on the inotifywait event types: https://linux.die.net/man/1/inotifywait

Upvotes: 3

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