Why does java in linux create descriptors to jar files of dependencies for each thread?

Question

linux

Faced the problem of a large number of file descriptors in the system. Checked with lsof. And I noticed that file descriptors are created for each java stream for each jar file in the dependencies folder. The total is descriptors = number of threads * number of dependency files. Which, with a large number of files in dependencies, creates a problem.
Why is it so arranged in the JVM? And is it possible to require jar file descriptors to be reused between threads?
(There is an option - fat jar, but it is not convenient for deployment)