8231368: Suppress warnings on non-serializable non-transient instance fields in java.security.jgss

Reviewed-by: mullan, coffeys

src/java.security.jgss/share/classes/sun/security/jgss/krb5/Krb5Context.java

@@ -1391,6 +1391,7 @@ class Krb5Context implements GSSContextSpi {
     static class KerberosSessionKey implements Key {
         private static final long serialVersionUID = 699307378954123869L;
 
+        @SuppressWarnings("serial") // Not statically typed as Serializable
         private final EncryptionKey key;
 
         KerberosSessionKey(EncryptionKey key) {

src/java.security.jgss/share/classes/sun/security/jgss/krb5/Krb5InitCredential.java

@@ -53,7 +53,9 @@ public class Krb5InitCredential
 
     private static final long serialVersionUID = 7723415700837898232L;
 
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Krb5NameElement name;
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Credentials krb5Credentials;
 
     private Krb5InitCredential(Krb5NameElement name,

src/java.security.jgss/share/classes/sun/security/krb5/internal/KRBError.java

@@ -79,7 +79,9 @@ import sun.security.krb5.internal.util.KerberosString;
  * <a href="http://www.ietf.org/rfc/rfc4120.txt">
  * http://www.ietf.org/rfc/rfc4120.txt</a>.
  */
-
+// The instance fields not statically typed as Serializable are ASN.1
+// encoded and written by the writeObject method.
+@SuppressWarnings("serial")
 public class KRBError implements java.io.Serializable {
     static final long serialVersionUID = 3643809337475284503L;