56. Process Monitoring

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

ApplicationPidFileWriter creates a file containing the application PID (by default, in the application directory with the file name, application.pid).
EmbeddedServerPortFileWriter creates a file (or files) containing the ports of the embedded server (by default, in the application directory with the file name application.port).

By default, these writers are not activated, but you can enable them in one of the ways described in the next section.

56.1 Extend Configuration

In the META-INF/spring.factories file, you can activate the listener(s) that writes a PID file, as shown in the following example:

org.springframework.context.ApplicationListener=\
org.springframework.boot.system.ApplicationPidFileWriter,\
org.springframework.boot.system.EmbeddedServerPortFileWriter

56.2 Programmatically

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.

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