If Tomcat cannot load static resource files such as CSS and JS, this may be related to the file path configuration or Tomcat configuration. Here are some possible solutions:
Check the file paths: Make sure the paths to the CSS and JS files are correct. This includes whether the file exists in the specified directory, whether the path is configured correctly, and whether the file name is spelled correctly.
Configure Servlet mapping: In the web.xml file, make sure you do not configure Servlet mapping to cause static resources to be intercepted. Normally, Tomcat handles static resources automatically, but if there is a mapping, it may cause problems.
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.css</url-pattern>
</servlet-mapping>
Check the Context configuration: If your project is deployed in Tomcat's context directory, make sure that the antiResourceLocking parameter is not configured in the context.xml file. Sometimes, setting this parameter to false may solve the problem.
<Context antiResourceLocking="false">
<!-- other configurations -->
</Context>
Use absolute paths: Use absolute paths to reference CSS and JS files in HTML files instead of relative paths. Make sure the path is correct and starts with a slash.
<link rel="stylesheet" type="text/css" href="/your-context-path/css/style.css">
<script src="/your-context-path/js/script.js"></script>
Check Tomcat logs: Check Tomcat's log files, especially the catalina.out file, to see if there are any errors or warnings related to static resources.
Firewall or proxy issues: If your application is running behind a firewall or proxy, make sure the firewall or proxy is configured correctly and does not block access to static resources.
Clear browser cache: Sometimes browser cache may cause static resources to fail to load. Try clearing your browser cache or using a cache-free browser window.
By checking the above factors, you should be able to solve the problem of Tomcat being unable to load static resource files such as CSS and JS.