src/java.base/share/classes/sun/net/www/protocol/jar/JarURLConnection.java

@@ -80,10 +80,13 @@
     throws MalformedURLException, IOException {
         super(url);
 
         jarFileURL = getJarFileURL();
         jarFileURLConnection = jarFileURL.openConnection();
+        // whether, or not, the embedded URL should use the cache will depend
+        // on this instance's cache value
+        jarFileURLConnection.setUseCaches(useCaches);
         entryName = getEntryName();
     }
 
     public JarFile getJarFile() throws IOException {
         connect();