Java 11 is unable to load the library.

Under ${JAVA_HOME/ext can be placed on extended class loaders up to Java 8.
Does the MAC change to /Library/Java/Extensions/ using the java.ext.dirs system properties?→It seems to be an old description including other sites, so I understand that it is an extended class loader.

JAVA9 has been deprecated with the introduction of the module system, so even if you put the JAR file here, you will not be able to enter the class loader.Place it in the environment variable CLASSPATH or specify it using -cp at startup.If you want to set up dependencies together, using maven/gradel is easy.

See below for more information.
https://docs.oracle.com/javase/jp/9/migrate/toc.htm