Code example in top-level specification https://docs.oracle.com/en/java/javase/12/docs/api/java.sql/java/sql/ConnectionBuilder.html
has the following:
================
Connection con = ds.createConnectionBuilder()
                       .user("rafa")
                       .password("tennis")
                       .setShardingKey(shardingKey)
                       .setSuperShardingKey(superShardingKey)
                       .build();
================
while the actual ConnectionBuilder API contains methods called just "shardingKey​(ShardingKey)" and "superShardingKey​(ShardingKey)"

This mismatch is present since the addition of ConnectionBuilder class - https://docs.oracle.com/javase/9/docs/api/java/sql/ConnectionBuilder.html