You need use SAVEPOINT in transaction:

do {
String savepointName = "any string"+class.hasCode();
Savepoint savePoint = conn.setSavepoint(savepointName);
try {
stmt.execute();
success = true;
} catch (SQLException sqle) {
conn.rollback(savePoint);
}
} while (!success);

查了一下jdk Connection的方法，有一个
setSavepoint()
Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.

我想知道，为什么要这么做？什么原因造成的？