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I am upgrade GeoServer to 2.20 version, but when specifying the data directory I get the error Found Java environment variable GEOSERVER_DATA_DIR set to /var/lib/geoserver_data/ , which is not writeable. I am check the owner of directory geoserver_data and is Tomcat. I am using Tomcat9

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Newer Tomcat 9 versions are more "secure" than previous versions and control where tomcat can read and write outside $CATALINA_HOME. You need to find the file /lib/systemd/system/tomcat9.service or equivalent which has the lines:

ReadWritePaths=/etc/tomcat9/Catalina/
ReadWritePaths=/var/lib/tomcat9/webapps/

and add a new line with your data directory.

Then run systemctl daemon-reload.

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