src/java.base/share/classes/sun/security/util/AnchorCertificates.java

@@ -29,12 +29,14 @@
 import java.io.FileInputStream;
 import java.security.AccessController;
 import java.security.KeyStore;
 import java.security.PrivilegedAction;
 import java.security.cert.X509Certificate;
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.HashSet;
+import java.util.Set;
 
 import sun.security.x509.X509CertImpl;
 
 /**
  * The purpose of this class is to determine the trust anchor certificates is in

@@ -42,11 +44,11 @@
  */
 public class AnchorCertificates {
 
     private static final Debug debug = Debug.getInstance("certpath");
     private static final String HASH = "SHA-256";
-    private static HashSet<String> certs;
+    private static Set<String> certs = Collections.emptySet();
 
     static  {
         AccessController.doPrivileged(new PrivilegedAction<Void>() {
             @Override
             public Void run() {