How does IntelliJ IDEA identify the port number of a Spring Boot project without outputting a log?

When the IntelliJ IDEA Ultimate version starts a Spring Boot project, it can magically display the project port number even if server.port is configured to 0 and the log output is off. How is this achieved?

Many people speculate that it is implemented through JMX. After disabling JMX, IDEA really cannot recognize the port. However, directly use jconsole to view the Spring Boot process properties, but the port information cannot be found.

The secret is that IntelliJ IDEA cleverly utilizes Java Agent technology. When starting the project, IDEA injects code into the process, creates a service that communicates with the IDEA client and provides process information. This allows IDEA to monitor and control running Spring Boot applications.

This mechanism is similar to remote communication using Java's RMI protocol. Through this injection and communication, IDEA can obtain various runtime information, including port numbers. Therefore, IDEA can accurately identify the ports of Spring Boot projects even if there is no log output.

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