--- old/src/java.base/share/classes/sun/security/pkcs/SigningCertificateInfo.java	2014-08-26 11:21:00.000000000 +0800
+++ new/src/java.base/share/classes/sun/security/pkcs/SigningCertificateInfo.java	2014-08-26 11:21:00.000000000 +0800
@@ -158,8 +158,8 @@
         }
         sb.append(hexDumper.encode(certHash));
         if (issuer != null && serialNumber != null) {
-            sb.append("\n\tIssuer: " + issuer + "\n");
-            sb.append("\t" + serialNumber);
+            sb.append("\n\tIssuer: ").append(issuer).append('\n');
+            sb.append('\t').append(serialNumber);
         }
         sb.append("\n]");
         return sb.toString();