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If necessary, upgrade to supported versions of Java, Apache Tomcat and your database: Oracle, SQL Server or MySQL / MariaDB. See Planning your Upgrade, above.
Remember, if you are upgrading Apache Tomcat, to restore any JDBC drivers needed for any data sources that use database technologies or versions not supported for PhixFlow's own connections. Make sure that any additional JDBC drivers you use are placed in:
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phixflow-login.xml
phixflow-domains.xml
phixflow-datasource.xml
phixflow-instance.xml
log4j.properties
logback.xml
phixflow-logging.xml
For example on Linux:cp $CV_ARCHIVE/phixflow-<current date>/WEB-INF/classes, to $TOMCAT/webapps/phixflow/WEB-INF/classes
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