After upgrading one of our testing environments to a newer oracle version, some of our services started to return the following error: SQLException: Unsupported character set (add orai18n.jar to your classpath) From the error message wording, one could suspect that this is an character set but after running Select value from SYS.NLS_DATABASE_PARAMETERS where PARAMETER = … Continue reading A short reminder – SQLException: Unsupported character set (add orai18n.jar to your classpath)