I'm using oracle 9.0.1, and ojdbc14/thin, but I can't insert strings > 
4k, with such exception: 
java.sql.SQLException: No more data to read from socket
	at oracle.jdbc.dbaccess.DBError.throwSqlException
(DBError.java:134)
	at oracle.jdbc.dbaccess.DBError.throwSqlException
(DBError.java:179)
	at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:1160)
	at oracle.jdbc.ttc7.MAREngine.unmarshalUB1(MAREngine.java:963)
	at oracle.jdbc.ttc7.MAREngine.unmarshalSB1(MAREngine.java:893)
	at oracle.jdbc.ttc7.Oclose.receive(Oclose.java:101)
	at oracle.jdbc.ttc7.TTC7Protocol.close(TTC7Protocol.java:683)
	at oracle.jdbc.driver.OracleStatement.close
(OracleStatement.java:644)
	at oracle.jdbc.driver.OraclePreparedStatement.privateClose
(OraclePreparedStatement.java:485)
	at oracle.jdbc.driver.OraclePreparedStatement.close
(OraclePreparedStatement.java:393)
	at net.sf.hibernate.impl.BatcherImpl.closePreparedStatement
(BatcherImpl.java:246)
	at net.sf.hibernate.impl.BatcherImpl.closeStatement
(BatcherImpl.java:132)
	at net.sf.hibernate.impl.BatcherImpl.abortBatch
(BatcherImpl.java:74)
	at net.sf.hibernate.persister.EntityPersister.insert
(EntityPersister.java:519)
	at net.sf.hibernate.persister.EntityPersister.insert
(EntityPersister.java:489)
	at net.sf.hibernate.impl.ScheduledInsertion.execute
(ScheduledInsertion.java:28)
	at net.sf.hibernate.impl.SessionImpl.executeAll
(SessionImpl.java:2303)
	at net.sf.hibernate.impl.SessionImpl.execute
(SessionImpl.java:2256)
	at net.sf.hibernate.impl.SessionImpl.flush
(SessionImpl.java:2182)

any ideas?