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

*** 87,98 ****
--- 87,106 ----
          jarFileURLConnection.setUseCaches(useCaches);
          entryName = getEntryName();
      }
  
      public JarFile getJarFile() throws IOException {
+         try {
              connect();
              return jarFile;
+         } catch (IOException e) {
+             if (jarFile != null) {
+                 return jarFile;
+             } else {
+                 throw e;
+             }
+         }
      }
  
      public JarEntry getJarEntry() throws IOException {
          connect();
          return jarEntry;