PreparedStatement and setting an array is now broken

Until version 8 (now using build 308), I used a prepared statement

INSERT INTO mytable(array_column) VALUES(?);

and

setString(1, my_formatter(java_array));

where my_formatter turns a Java double[] into a string in the form {1.0} .

This doesn't work any more, with the error message that character
varying can not be converted to real[] . I think it's with the driver,
because the braces form still works fine with psql. I changed the
formatter to produce a string in ARRAY[1.0] notation with the same error
message.