How does IntelliJ IDEA identify the port number of Spring Boot project through JavaAgent technology?

How does IntelliJ IDEA detect Spring Boot application port?

IntelliJ IDEA Ultimate Edition has a powerful feature: automatically identify the running port of Spring Boot application. It can accurately display the port number even if server.port is configured to 0 or log output is turned off. Although it is rumored that this information comes from JMX, the port number after disabling the IDEA run configuration cannot be displayed, but the matching port number is not found when viewing the Spring Boot application properties through jconsole , which triggers our exploration of its implementation mechanism.

In fact, IntelliJ IDEA cleverly utilizes Java Agent technology. Java Agent is a proxy technology that injects code when the target process starts. The injected code starts a service, responds to instructions from the IntelliJ IDEA client, and returns process information, thereby realizing IDEA's manipulation of the process. This is how IDEA obtains the running port of Spring Boot application.

This communication mechanism is similar to Java's RMI (Remote Method Calling) protocol. Through the Java Agent, IDEA can communicate with the running Spring Boot process and obtain various information including port numbers. This allows IDEA to accurately identify and display the running port of Spring Boot application without relying on JMX.

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