In Oracle Database 18.104.22.168, OJVM will no longer support the compilation of SQLJ source or executing SQLJ classes.
SQLJ on the client side will continue to be developed, shipped and supported. Only the part inside the DB is affected. Existing SQLJ code that runs inside the DB will need to be re-coded to use generic JDBC.
Furthermore JPub (client-side and inside-DB) will not get shipped anymore with Oracle Database 12.2. It got removed from the RDBMS code. There is no replacement.