Not sure the prerequisite to make a java filter plugin

https://www.elastic.co/guide/en/logstash/current/java-filter-plugin.html

This document do not show the prerequisite to make a custom java plugin.
I am using logstash 6.5.4
is it available to make a custom one?
Also, is there a logstash codebase jar available directly instead of ./gradlew assemble because i do not have network access for my server
It is really frustrating.
Thank you in advance

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