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[1.17.1] How to change the property of an entity by command


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Thanks to this forum, I succeeded to summon my own entity.

Now I want to control it by command, but can not access to it.


MyEntity.java has a property, ‘isFlying’ like this:

public class MyEntity extends Animal {
	public boolean isFlying = false;


And I want to change the flag by command like these, of course failed (showed no error message):

data merge entity @e[type=mymod:myentity, limit=1, name="myentity"] {isFlying: 1b}
data merge entity @e[type=mymod:myentity, limit=1, name="myentity"] {Attributes: [{Name:"generic.isFlying", Base:1b}]}


Any good way to change the flag of the entity object?

Thanks in advance.

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