--- old/src/java.base/share/classes/java/security/CodeSigner.java	2014-08-26 11:19:59.000000000 +0800
+++ new/src/java.base/share/classes/java/security/CodeSigner.java	2014-08-26 11:19:58.000000000 +0800
@@ -156,9 +156,9 @@
     public String toString() {
         StringBuilder sb = new StringBuilder();
         sb.append("(");
-        sb.append("Signer: " + signerCertPath.getCertificates().get(0));
+        sb.append("Signer: ").append(signerCertPath.getCertificates().get(0));
         if (timestamp != null) {
-            sb.append("timestamp: " + timestamp);
+            sb.append("timestamp: ").append(timestamp);
         }
         sb.append(")");
         return sb.toString();