276. Implementing SWS for a Java runtime directory

Starting with JDK 9 (JEP 220), the runtime images have been restructured to support modules and become more performant and secure. Moreover, naming stored modules, classes, and resources has received a new URI scheme (jrt). Via the jrt scheme, we can reference modules, classes, and resources contained in runtime images without touching the internal structure of the image. A jrt URL looks as follows:

jrt:/[$MODULE[/$PATH]]

Here, $MODULE is a module name (optional) and $PATH (optional) represents the path to a certain class/resource file within that module. For instance, to point out the File class, we write the following URL:

jrt:/java.base/java/io/File.class

In the jrt file system, there is a top-level modules directory that contains one subdirectory for each module in the image. So, we can fetch the proper path for SWS as follows:

private static Path jrtFileSystem() {
  URI uri = URI.create("jrt...