Error jar hell in installing my own elastic plugin

Hi! I have a problem while installing my authentication plugin on elasticsearch. I get below error:

thanks for helping me!

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Apparently you are embedding Jackson within your plugin which you should not do.

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I'm sorry, i didn't notice! I will consider your tip from now on!

I import Jackson in my .pom file because I wanna use some of its modules! what should i do instead?
I remove the Jackson dependency but the error just didn't go away!

Jackson is already provided by elasticsearch. Just don't add it.
What is the error when you remove this dependency?

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