Way back in 2020 the developers made an announcement about major changes to Minecraft: Java Edition, as players would soon have to switch from a Mojang account to one with a Microsoft account in order to continue playing. This is a bit 'early' in a relative sense, considering that we're not yet at the deadline but the developers have confirmed the date and put out the final call for account migration.
You'll no longer be able to play Minecraft: Java Edition if you have a Mojang account. To "improved security, player safety" the developers want everyone to switch to Microsoft accounts. They are offering free Minecraft caps to encourage players to switch.
You can find all the details on how to migrate your account here. Java Edition will continue to be supported as normal after the change and will continue be a distinct entity from Bedrock. This is purely a unification of the account system. You'll be able to use your old username it's just that you'll need have an Xbox gamertag associated with it.
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