How to change a Minecraft player's glow color using the Bukkit / Spigot / Paper APIs

HowToChangePlayerGlowColor.md

The player.setGlowing(true) method can be used to enable / disable the glowing effect for any player

The default glow color is white, but this color can be changed using Scoreboard Teams

First, obtain a reference to the main scoreboard using Bukkit.getScoreboardManager().getMainScoreboard()

You must set this as the player's scoreboard using player.setScoreboard(mainScoreboard)

Next, use the main scoreboard to create a team using mainScoreboard.registerNewTeam(ChatColor.BLUE + "team")

Now that the team has been created, you must set the team color using team.setColor(ChatColor.BLUE)

Finally, add the player to the team using team.addEntry(player.getName())

Note: In this example we created a new team on the main scoreboard. This should only be done once. You can use mainScoreboard.getTeam(teamName) to obtain a reference to an existing team if necessary. Note that the team name must begin with the name of the team color for the glowing effect to work.