The java.util.jar.Pack200 APIs were removed.

The java.util.jar.Pack200 class and its java.util.jar.Pack200.Packer and java.util.jar.Pack200.Unpacker interfaces have been removed from Java SE 14. In addition to the APIs, the pack200 and unpack200 tools in the jdk.pack module have been removed. If Pack200 is being used to compress your application, the jlink or jpackage tools can be used instead.

For more information on these changes, see APIs Removed in Java SE 14.