Transactioning with MySQL

Can someone explain why my transaction is being committed on
loc.save(connection) when it should be rolled back?

Torque.init("Torque.properties");
java.sql.Connection connection =
org.apache.torque.util.Transaction.begin(Torque.getDefaultDB());
Location loc = new Location();
loc.setAltitude(BigDecimal.ONE);
loc.setLongitude(BigDecimal.ONE);
loc.setLatitude(BigDecimal.ONE);    
loc.save(connection);
org.apache.torque.util.Transaction.safeRollback(connection);

I'm using a MySQL db and I am able to successfully use torque with
everything other than Transactioning.

Any help would be appreciated.

- Dom
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