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IntelliJ IDEA cleverly recognizes the secret of the port number of Spring Boot project
Home Java javaTutorial How does IntelliJ IDEA identify the port number of Spring Boot project through JavaAgent and RMI technology?

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

Apr 19, 2025 pm 06:18 PM
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How does IntelliJ IDEA identify the port number of Spring Boot project through JavaAgent and RMI technology?

IntelliJ IDEA cleverly recognizes the secret of the port number of Spring Boot project

When the IntelliJ IDEA Ultimate version starts the Spring Boot project, it can automatically identify and display the port number, which greatly facilitates developers. This function is still valid even if server.port is set to 0 or log output is turned off. Many people mistakenly think that JMX technology is working, but after disabling JMX, IDEA can still recognize the port number. Why is this?

The answer lies in IntelliJ IDEA using Java Agent technology. When IDEA starts the project, it injects a piece of code into the target process to start an internal service. This service receives instructions from IDEA and feeds process information (including port number) to IDEA. In this way, IDEA can monitor and manage project operation status.

This communication between services is usually based on the Java RMI (Remote Method Invocation) protocol. RMI implements real-time data exchange between IDEA and Spring Boot projects, ensuring real-time identification of port numbers. Therefore, even if JMX is disabled, IDEA can still obtain port number information through the Java Agent and RMI mechanism.

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