I was thinking what my new mod could do.

Then, I thought of increasing the player's health.

I know I can do that through giving player Absorbtion or stuff like that, but I dont want to.

Any clues?

Use an AttributeModifier for a permanent (or temporary) boost to max health.

Then How to use that Modifier? and Where is it located?

I plan to increase the player's health up, and up. (Of course, I will add some more code to limit that.)

And THEN after that player died and respawn, I want their health back to normal.

 

That is:

The player is alive, he has a max of 100 health

Unfortunately he is killed by a great mass of blowin creepers

Now, he respawns, he have 20 health, as much as the default.

 

How do I do that?

OK, I got that. Problem is solved.

 

I heal and increase the total health of the player at an interval. (So, when he is healed, he gains some max health)

For example, he is healed 2 hearts and gained 2 hearts for max health.

Then, he dies, with his current health larger than normal. (Say, he dies with max health = 100)

Then, his health is back to normal (20).

 

I intercepted PlayerRespawnEvent, and have the health adjusted back to normal.