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I'm not sure this is the best forum to deal with this question. While you are using JPA, the problem seems to be at the JDBC/database level which is doing the conversion between Java types to Oracle types, as described here:
If using the 10g drivers, the "V8Compatible" property may help. But if not, I cannot suggest much without modifying the table column type to TIMESTAMP and rebuilding the index or using Oracle.sql.Date in your object directly instead.