Selecting entire row into instance of jpub class gives error

Question

Hi. I'm using oracle 9i. I used JPublisher to create classes for my db objects, and now I want to execute:
select value(u) from university_tb where u.name = 'Harvard';
where university_tb is a table of university_t. I want to have the row returned into an instance of my java university_t class. So I create an instance of university_t and then say:
ResultSet rs = stmt.executeQuery("select value(u) from University_tb u");
rs.next();
uniInstance = ((university_t)rs.getObject(1));
I get an error which I traced to the casting of the returned object into a university_t. JPub classes use the readSQL() method to handle casting of an object. That's where my error occurs.
public void readSQL(SQLInput stream, String type)
throws SQLException
super.readSQL(stream, type);
setDescription(stream.readString());
setAddress((AddressT) stream.readObject()); <-- IT OCCURS RIGHT HERE
setYearfoundation(stream.readString());
setContactinfo((ContactinfoT) stream.readObject()); <-- IF I REMOVE THE LINE ABOVE IT OCCURS RIGHT HERE INSTEAD
setPresident(stream.readRef());
setFaculties(stream.readArray());
So it can be seen that in both cases it happens when trying to read a non-primitive type. Has anyone heard of any problems/solution with the readSQL() method of jpublisher classes, when there is a non-primitve, user defined type? My schema definitions follow. Any advice would be appreciated. Thanks.
create or replace type Address_t as object
( Num int,
Street varchar2(100),
City varchar2(50),
Province varchar2(50),
Country varchar2(50),
Postcode varchar2(15));     
create type contactinfo_t as object (
phone varchar2(20),
fax varchar2(20),
email varchar2(35));
create type unit_t as object (
name varchar2(200)) not final;
create or replace type University_t under unit_t
     Description varchar2(1000),
     Address Address_t,
     YearFoundation varchar2(10),
     ContactInfo ContactInfo_t,
     President ref Person_t,
     Faculties AcademicUnit_nt);

Answer 1

Hi Saro,
DBMS_STATS.AUTO_SAMPLE_SIZE is a DB setting set for the Estimate Percentage.
We can know the value currently set by using below SQL.
SQL> select dbms_stats.get_prefs('ESTIMATE_PERCENT','DACREP','W_ETL_RUN_S') from dual;
assuming DACREP is the owner of the DAC Repository. If the value is not set please set it by below SQL. The 2 in sql is variable you can size it optimal.
SQL> exec dbms_stats.set_database_prefs('ESTIMATE_PERCENT',2);
Regards,
Jay