Problem in working with Custom Objects

[Varun Rupela]

Hello:
I am trying to learn to use JDBC in order to translate between Custom Java Objects to SQL Objects. I used the example on the following link -
Oracle 8i JDBC Developers Guide and Reference - Sample Application
On trying the example from the above link I get the following exception:

  
Exception in thread "main" java.sql.SQLException: Fail to convert to internal representation: EmployeeObj@18449e2
        at java.lang.Throwable.fillInStackTrace(Native Method)
        at java.lang.Throwable.fillInStackTrace(Compiled Code)
        at java.lang.Throwable.<init>(Compiled Code)
        at java.lang.Exception.<init>(Exception.java:42)
        at java.sql.SQLException.<init>(SQLException.java:82)
        at oracle.jdbc.dbaccess.DBError.check_error(DBError.java)
        at oracle.sql.STRUCT.toSTRUCT(STRUCT.java)
        at oracle.jdbc.driver.OraclePreparedStatement.setObject(OraclePreparedStatement.java)
        at oracle.jdbc.driver.OraclePreparedStatement.setObject(OraclePreparedStatement.java)
        at SQLDataExample.main(Compiled Code)

Please help me with the following:
- Why must I get the error?
- How can I correct it?
Thank you.