diff --git a/src/test/java/com/sunyard/sydapi/sample/RSAP1SignVerify.java b/src/test/java/com/sunyard/sydapi/sample/RSAP1SignVerify.java
index 427e245..9d7b62d 100644
--- a/src/test/java/com/sunyard/sydapi/sample/RSAP1SignVerify.java
+++ b/src/test/java/com/sunyard/sydapi/sample/RSAP1SignVerify.java
@@ -4,11 +4,11 @@ import com.sunyard.cert.X509;
 import com.sunyard.proto.Util;
 import racal.sunyard.main.SydApi4j;
 import racal.sunyard.main.SydApiBuilder;
-import sun.misc.BASE64Encoder;
 import sun.security.provider.X509Factory;
 
 import java.io.UnsupportedEncodingException;
 import java.nio.ByteBuffer;
+import java.util.Base64;
 
 public class RSAP1SignVerify {
     private static byte[] createBlock(byte type, byte[] in) {
@@ -106,8 +106,8 @@ public class RSAP1SignVerify {
                     byte[] bSource = source.getBytes();
 
                     byte[] derCert = Util.decodeBase64(signCert);
-                    BASE64Encoder encoder = new BASE64Encoder();
-                    cert = X509Factory.BEGIN_CERT + "\n" + encoder.encodeBuffer(derCert) + X509Factory.END_CERT;
+                    Base64.Encoder encoder = Base64.getEncoder();
+                    cert = X509Factory.BEGIN_CERT + "\n" + encoder.encodeToString(derCert) + X509Factory.END_CERT;
                     X509 X509Cert = api.GetX509CertInfo(cert);
 
                     byte[] signature = Util.decodeBase64(signatureBase64);