Which service needs to be restarted to fix common Tomcat application errors?

Restarting the Tomcat service is crucial for resolving various application errors because Tomcat is the underlying server that executes Java-based web applications. When configuration files are changed, new application versions are deployed, or if there are issues such as memory leaks or application crashes, restarting the Tomcat service helps to refresh its state and reload the applications. This action ensures that any changes made are acknowledged and enables the server to clear up any temporary issues, leading to improved performance and stability.

In this context, while other services like the database service can sometimes cause application issues, they are not directly linked to Tomcat's operation itself in the same way that restarting Tomcat would be. In addition, the file service and data upload service pertain to handling files or uploads, and neither would typically resolve errors rooted in the web application architecture managed by Tomcat. Therefore, focusing on the Tomcat service is the most effective solution for addressing application-level errors.