Do java.sql.Array/Blob/Clob types need to be "free()"ed?

Do I need an explicit to call free() on Arrays, clobs etc... or will closing the ResultSet and/or Statement automatically take care of this? The javadoc doesn't say anything, so I assume that it's not necessary, but I would hate to make an incorrect assumption.

Also, if its not necessary, is it a good idea if you're going to close the result set right away? I could see how it might help if you're not going to do so.