In the spring-boot module, you can find two classes to create files that are often useful for process monitoring:spring-doc.cn

  • ApplicationPidFileWriter creates a file that contains the application PID (by default, in the application directory with a file name of application.pid).spring-doc.cn

  • WebServerPortFileWriter creates a file (or files) that contain the ports of the running web server (by default, in the application directory with a file name of application.port).spring-doc.cn

By default, these writers are not activated, but you can enable them:spring-doc.cn

Extending Configuration

In the META-INF/spring.factories file, you can activate the listener (or listeners) that writes a PID file:spring-doc.cn

org.springframework.context.ApplicationListener=\
org.springframework.boot.context.ApplicationPidFileWriter,\
org.springframework.boot.web.context.WebServerPortFileWriter

Programmatically Enabling Process Monitoring

You can also activate a listener by invoking the SpringApplication.addListeners(…​) method and passing the appropriate Writer object. This method also lets you customize the file name and path in the Writer constructor.spring-doc.cn