$ jdeps --jdk-internals netty-common-4.1.140.Final.jar     (excerpt)
netty-common-4.1.140.Final.jar -> jdk.unsupported
   io.netty.util.internal.CleanerJava9                -> sun.misc.Unsafe                                    JDK internal API (jdk.unsupported)
   io.netty.util.internal.CleanerJava9$1              -> sun.misc.Unsafe                                    JDK internal API (jdk.unsupported)
   io.netty.util.internal.CleanerJava9$2              -> sun.misc.Unsafe                                    JDK internal API (jdk.unsupported)
JDK Internal API                         Suggested Replacement
----------------                         ---------------------
sun.misc.Unsafe                          See https://openjdk.org/jeps/260

$ jdeps --jdk-internals netty-common-4.1.140.Final.jar | grep -c -- '-> sun.misc.Unsafe'
27