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Web Server Failed to Start. Port 8080 Was Already in Use. Spring Boot

When developing a web application, a common problem can be a web server failing to start due to port 8080 already being in use. This can be a particular issue when using Spring Boot, as the default port is 8080. In this article, we will discuss the steps necessary to investigate and resolve this issue.

Investigating the Error

When a web server fails to start, the first step is to identify the root cause. In this case, the most likely cause is that port 8080 is already in use. To confirm this, the user can check the current port usage by running the command ‘netstat -an’ in the command line. This will list all the ports currently in use and their associated applications.

If port 8080 is indeed in use, the user can then identify the application that is using the port. Once the application has been identified, the user can then decide whether to terminate the application or change the port of the web server.

Resolving the Conflict

If the user decides to terminate the application that is using port 8080, they can do so by running the command ‘kill -9 ’, where is the process ID of the application. Once the application has been terminated, the user can then start the web server again and it should now be able to use port 8080.

If the user decides to change the port of the web server, they can do so by modifying the application.properties file and changing the ‘server.port’ property to a different port. Once the port has been changed, the user can then start the web server again and it should now be able to use the new port.

In conclusion, when a web server fails to start due to port 8080 being in use, the user can investigate the issue by running the command ‘netstat -an’ and identifying the application that is using the port. The user can then choose to either terminate the application or change the port of the web server, depending on the specific needs of their application.

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