Bit string type in PreparedStatement

I have a table with a bit string field
CREATE TABLE test (a BIT(8));

When I get the type of this filed from Java

Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery("SELECT a FROM
test");
ResultSetMetaData rsmd = rs.getMetaData();
int type = rsmd.getColumnType(1);
String name = rsmd.getColumnTypeName(1);

I get

type=-7 that is equal to java.sql.Types.BIT
name=bit


Now I'd like to set the field in a PreparedStatement
PreparedStatement update =
connection.prepareStatement("UPDATE test SET a=?");
update.setObject(1, "B10101010", java.sql.Types.BIT);
update.executeUpdate();

and I get
org.postgresql.util.PSQLException: ERROR: column "a"
is of type bit but expression is of type boolean

How can I set bit string field in PreparedStatement?


Thanks.

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