Error starting ApplicationContext. To display the condition evaluation···

AD钙奶-lalala2026-02-13 9:46

启动java后端程序报错：

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Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
2026-02-12T09:26:15.311+08:00 ERROR 35234 --- [model] [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Web server failed to start. Port 8080 was already in use.

Action:

Identify and stop the process that's listening on port 8080 or configure this application to listen on another port.


Process finished with exit code 1

这是典型的 Spring Boot 报错：

Port 8080 was already in use

说明 8080 端口已经被别的进程占用了。

你本机已经有一个服务在跑（很可能是你之前启动的项目）。

如果是是 mac，执行：

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lsof -i :8080

会看到类似：

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java    12345 yourname   ...  TCP *:8080 (LISTEN)

记住 PID（比如 12345）

然后执行：

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kill -9 12345

再重新启动项目即可。