Even after renaming my .war file to ROOT.war, why do I still need to enter the full name and /appname?

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If you have renamed your .war file to ROOT.war, it should be deployed as the default application for your server. However, you may still need to enter the full name and /appname if your server is not configured to recognize the default application.

This can happen if your server has multiple applications deployed or if it is configured to look for a specific application on startup. In this case, you will need to specify the application name in the URL to access the correct application.

To avoid this issue, you can configure your server to recognize the default application. This can be done by modifying the server's configuration files, such as its web.xml or server.xml file, to set the default context root to '/' or to the name of your default application (e.g. '/ROOT' instead of '/').

Once you have made these changes, your server should recognize the default application without the need to specify the full name and /appname in the URL.