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TAF is based on OCI (Oracle Call Interface). So every client using OCI can/may profit from TAF.
JDBC Thick requires an Oracle Client to be installed, hence you have OCI and therefore TAF.
JDBC Thin does not require an Oracle Client to be installed (just the appropriate JAR files) and is not based on OCI, hence NO TAF.
Most JDBC implementations prefer to work with JDBC Thin clients, therefore you will often find JDBC (Thin) does not support TAF. Unfortunately these posts forget to mention the "Thin".