--- old/src/java.base/share/classes/sun/security/provider/JavaKeyStore.java	2019-08-14 00:18:07.000000000 +0800
+++ new/src/java.base/share/classes/sun/security/provider/JavaKeyStore.java	2019-08-14 00:18:06.000000000 +0800
@@ -68,10 +68,12 @@
         }
     }
 
-    // special JKS that supports JKS and PKCS12 file formats
-    public static final class DualFormatJKS extends KeyStoreDelegator {
-        public DualFormatJKS() {
-            super("JKS", JKS.class, "PKCS12", PKCS12KeyStore.class);
+    // special JKS that supports JKS/PKCS12/PEM file formats
+    public static final class MultipleFormatJKS extends KeyStoreDelegator {
+        public MultipleFormatJKS() {
+            super("JKS", JKS.class,
+                    List.of("PKCS12", "PEM"),
+                    List.of(PKCS12KeyStore.class, PemKeyStore.class));
         }
     }