--- old/src/java.base/share/classes/sun/security/tools/keytool/Main.java	2019-08-14 00:18:11.000000000 +0800
+++ new/src/java.base/share/classes/sun/security/tools/keytool/Main.java	2019-08-14 00:18:11.000000000 +0800
@@ -936,6 +936,8 @@
             storetype = keyStore.getType();
             if (storetype.equalsIgnoreCase("pkcs12")) {
                 isPasswordlessKeyStore = PKCS12KeyStore.isPasswordless(ksfile);
+            } else if (storetype.equalsIgnoreCase("pem")) {
+                isPasswordlessKeyStore = true;
             }
         } else {
             if (storetype == null) {
@@ -2195,6 +2197,8 @@
                 srcstoretype = store.getType();
                 if (srcstoretype.equalsIgnoreCase("pkcs12")) {
                     srcIsPasswordless = PKCS12KeyStore.isPasswordless(srcksfile);
+                } else if (srcstoretype.equalsIgnoreCase("pem")) {
+                    srcIsPasswordless = true;
                 }
             } else {
                 if (srcstoretype == null) {