The following feature is deprecated in this release, and may be desupported in a later release:
Starting Oracle Database 12c Release 2 (12.2), the oracle.sql.* package is deprecated.
The following features are no longer supported by Oracle:
SQLJ in the Server
Starting with Oracle Database 12c Release 2 (12.2), Oracle does not support server-side SQLJ code.
Oracle supports using client-side SQLJ. However, Oracle does not support the use of server-side SQLJ, including running stored procedures, functions, and triggers in the database environment.
All Oracle JPublisher features are desupported and unavailable in Oracle Database 12c Release 2 (18.104.22.168). Oracle recommends that you use the alternatives listed here:
To continue to use Web service callouts, Oracle recommends that you use the Oracle JVM Web Services Callout utility, which is a replacement for the Web Services Callout utility.
To replace other JPublisher automation capabilities, including mapping user-defined SQL types or SQL types, wrapping PL/SQL packages and similar capabilities, Oracle recommends that developers use explicit steps, such as precompiling code with SQLJ precompiler, building Java STRUCT classes, or using other prestructured options.
My Oracle Support Note 1937939.1 for more information about JDeveloper deprecation and desupport:
Oracle Database Upgrade Guide to see a list of all desupported features in this release of Oracle Database