jdk.nio.zipfs.ZipFileSystem does not currently support a way to explicitly ask for a read-only file system. You will sometimes be given a read-only file system (e.g. when the JAR source is multi-release) but you cannot force this to occur.

Adding an `accessMode` environmental parameter with values `readOnly` and `readWrite` would permit an easy way for users to control how they access ZIP/JAR files.