--- a/src/java.base/share/classes/sun/security/tools/keytool/Main.java	Mon Nov 26 15:06:53 2018 -0800
+++ b/src/java.base/share/classes/sun/security/tools/keytool/Main.java	Tue Nov 27 08:51:20 2018 +0800
@@ -1328,28 +1328,39 @@
             if (f.exists()) {
                 // Probe for real type. A JKS can be loaded as PKCS12 because
                 // DualFormat support, vice versa.
-                keyStore = KeyStore.getInstance(f, pass);
-                String realType = keyStore.getType();
-                if (realType.equalsIgnoreCase("JKS")
-                        || realType.equalsIgnoreCase("JCEKS")) {
-                    boolean allCerts = true;
-                    for (String a : Collections.list(keyStore.aliases())) {
-                        if (!keyStore.entryInstanceOf(
-                                a, TrustedCertificateEntry.class)) {
-                            allCerts = false;
-                            break;
+                String realType = storetype;
+                try {
+                    keyStore = KeyStore.getInstance(f, pass);
+                    realType = keyStore.getType();
+                    if (realType.equalsIgnoreCase("JKS")
+                            || realType.equalsIgnoreCase("JCEKS")) {
+                        boolean allCerts = true;
+                        for (String a : Collections.list(keyStore.aliases())) {
+                            if (!keyStore.entryInstanceOf(
+                                    a, TrustedCertificateEntry.class)) {
+                                allCerts = false;
+                                break;
+                            }
+                        }
+                        // Don't warn for "cacerts" style keystore.
+                        if (!allCerts) {
+                            weakWarnings.add(String.format(
+                                    rb.getString("jks.storetype.warning"),
+                                    realType, ksfname));
                         }
                     }
-                    // Don't warn for "cacerts" style keystore.
-                    if (!allCerts) {
-                        weakWarnings.add(String.format(
-                                rb.getString("jks.storetype.warning"),
-                                realType, ksfname));
-                    }
+                } catch (KeyStoreException e) {
+                    // Probing not supported, therefore cannot be JKS or JCEKS.
+                    // Skip the legacy type warning at all.
                 }
                 if (inplaceImport) {
-                    String realSourceStoreType = KeyStore.getInstance(
-                            new File(inplaceBackupName), srcstorePass).getType();
+                    String realSourceStoreType = srcstoretype;
+                    try {
+                        realSourceStoreType = KeyStore.getInstance(
+                                new File(inplaceBackupName), srcstorePass).getType();
+                    } catch (KeyStoreException e) {
+                        // Probing not supported. Assuming srcstoretype.
+                    }
                     String format =
                             realType.equalsIgnoreCase(realSourceStoreType) ?
                             rb.getString("backup.keystore.warning") :