8210373: Deadlock in libj2gss.so when loading "j2gss" and "net" libra…

…ries in parallel.

Backport-of: 991f7c1

src/java.security.jgss/share/classes/sun/security/jgss/wrapper/SunNativeProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -73,8 +73,12 @@ public HashMap<String, String> run() {
                         DEBUG = Boolean.parseBoolean
                             (System.getProperty(DEBUG_PROP));
                         try {
+                            // Ensure the InetAddress class is loaded before
+                            // loading j2gss. The library will access this class
+                            // and a deadlock might happen. See JDK-8210373.
+                            Class.forName("java.net.InetAddress");
                             System.loadLibrary("j2gss");
-                        } catch (Error err) {
+                        } catch (ClassNotFoundException | Error err) {
                             debug("No j2gss library found!");
                             if (DEBUG) err.printStackTrace();
                             return null;