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Reading nested oracle cursors getCursor(col) throws ORA-01002 "Fetch out of sequence"

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On oracle 9i
I'm trying to read the nested cursors that are
returned by a request, (using "cursor" keyword
or PL/SQL function which returns cursors).

however, when I try to "getCursor" or "getObject"
the cursor column, I get the "ORA-01002: fetch out of sequence" SQL exception.

metaInfo show the types are good...
autocommit is false (same with true).
How can one safely read the content of NESTED cursors?
ps: my methods works perfectly with simple
cursors returned by stored functions or procedures.

The request looks like
T.*, cursor(select * from U where
from T
or through PL/SQL function returning cursor like:
T.*, PACKAGE1.getUByOwner from T
I create the usual Statement,
get the ResultSet,
and it fails on
((OracleResultSet) resultSet).getCursor(col);

the columns is
of SQL type name "REFCURSOR" according to the ResultSetMetaData,
and metaInfo.getColumnType(col) == oracle.jdbc.OracleTypes.CURSOR
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