Most importantly, if you use jars with rubber seals, remove them before sterilizing the bottles and lids.  Stove method: First, wash the lids and jars in hot water with some soap, and rinse well. Now place only the jars in a pot of boiling water upside down. Boil for 10 minutes, then reduce the heat and simmer until ready to use. Meanwhile, you can put the lids and bands in a separate saucepan of simmering water but do not boil them. After sterilizing, dry the bottles nicely before transferring the jam.