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This feature is exclusive to Java Edition. 
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Creates and modifies boss bars.


bossbar add <id> <name>
Create a new boss bar.
bossbar get <id> (max|players|value|visible)
Return the requested setting as a result of the command.
bossbar list
Display a list of existing boss bars.
bossbar remove <id>
Remove an existing bossbar.
bossbar set <id> (color|max|name|players|style|value|visible)
... color (blue|green|pink|purple|red|white|yellow)
Set the text color (if no color was specified as part of a text component) and bar color. Defaults to white upon creation.
... max <max>
Set the boss bar's maximum value. Defaults to 100 upon creation.
... name <name>
Set the boss bar's name.
... players [<targets>]
Change the set of players to whom the bar is visible. Defaults to none upon creation.
... style (notched_6|notched_10|notched_12|notched_20|progress)
Set the boss bar's visual amount of segments: continuous, 6 segments, 10 segments, 12 segments, or 20 segments. Defaults to progress upon creation.
... value <value>
Set the boss bar's current value. Defaults to 0 upon creation.
... visible <visible>
Set the boss bar's visibility. Defaults to true upon creation.


<id>: resource_location

Specifies a unique boss bar.
Must be a resource location.

<name>: component

Specifies the display name of the boss bar.
Must be a raw JSON text.

<max>: integer

Specifies the boss bar's maximum value.
Must be a 32-bit integer number. And it must be between 1 and 2147483647 (inclusive).

<targets>: entity

Specifies the set of players to whom the bar is visible.
Must be a player name, a target selector or a UUID. And the target selector must be of player type.

<value>: integer

Specifies the boss bar's current value.
Must be a 32-bit integer number. And it must be between 0 and 2147483647 (inclusive).

<visible>: bool

Specifies the boss bar's visibility.
Must be a boolean (either true or false).


CommandTriggerJava Edition
anythe arguments are not specified correctly Unparseable
/bossbar set ...
/bossbar remove ...
/bossbar get
the specified boss bar doesn't exist Failed
/bossbar add ...a boss bar with specified id have already existed
/bossbar set ...the boss bar's property have already been the same as the specified value
anyOn successCreates, modifies or lists boss bar(s).


CommandEditionSituationSuccess Count/execute store success .../execute store result ...
anyJava EditionOn fail000
/bossbar add ...
/bossbar list
/bossbar remove ...
On success11The number of custom bossbars that exist after the command is executed.
Bossbars created by the game itself (such as the boss bar of the ender dragon) aren't included.
/bossbar get <id> max
/bossbar set <id> max
On success11The boss bar's maximum value after the command's execution.
/bossbar get <id> value
/bossbar set <id> value
On success11The boss bar's value after execution.
/bossbar get <id> players
/bossbar set <id> players
On success11The number of players to whom the bar is visible after execution.
/bossbar get <id> visibleOn success111 if the boss bar is visible; otherwise 0.
/bossbar set <id> color
/bossbar set <id> name
/bossbar set <id> style
/bossbar set <id> visible
On success110


Java Edition
1.1318w05aAdded bossbar.