In 2020, the developers announced a major update to Minecraft: Java Edition. Players will soon have to transfer their Mojang account to an Microsoft account to continue playing. Although it's an interminable time the developers have confirmed the date and issued the final invitation for account migration. You will no longer be able to play Minecraft: Java Edition if you have a Mojang account. Before You Point Your Finger At Me are encouraging all users to switch to Microsoft accounts to "improved security and player safety" and are entice people to make the change by offering free Minecraft capes. You can find all information about how to move your account here. Java Edition will be supported as usual following the change and will remain a distinct entity from Bedrock. This is a purely unification of the account systems. You'll be able to keep your old username but you'll need to have an Xbox gamertag to match it.