diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/PemUtils.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/PemUtils.java
index c039ccb63..1983fb338 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/PemUtils.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/PemUtils.java
@@ -47,7 +47,7 @@ public class PemUtils {
 
   public static X509Certificate loadCertificate(InputStream inputStream) {
     try {
-      CertificateFactory cf = CertificateFactory.getInstance("X509");
+      CertificateFactory cf = CertificateFactory.getInstance("X.509");
       X509Certificate cert = (X509Certificate) cf.generateCertificate(inputStream);
       cert.checkValidity();
       return cert;
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/RsaCryptoUtil.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/RsaCryptoUtil.java
index 295303740..d8fe3b35b 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/RsaCryptoUtil.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/v3/util/RsaCryptoUtil.java
@@ -47,7 +47,7 @@ public class RsaCryptoUtil {
           Object oldValue = field.get(encryptObject);
           if (oldValue != null) {
             String oldStr = (String) oldValue;
-            if (!oldStr.trim().equals("'")) {
+            if (!"".equals(oldStr.trim())) {
               field.set(encryptObject, encryptOAEP(oldStr, certificate));
             }
           }