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

@@ -87,12 +87,20 @@
         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;