diff --git a/src/main/java/io/zhile/crack/atlassian/agent/KeyTransformer.java b/src/main/java/io/zhile/crack/atlassian/agent/KeyTransformer.java
index 84955cf..832cbc6 100644
--- a/src/main/java/io/zhile/crack/atlassian/agent/KeyTransformer.java
+++ b/src/main/java/io/zhile/crack/atlassian/agent/KeyTransformer.java
@@ -29,9 +29,23 @@ public class KeyTransformer implements ClassFileTransformer {
 
     private byte[] handleKeySpec() throws IllegalClassFormatException {
         try {
+            String b64f;
             ClassPool cp = ClassPool.getDefault();
             cp.importPackage("java.util.Arrays");
-            cp.importPackage("javax.xml.bind.DatatypeConverter");
+
+            try {
+                Class.forName("java.util.Base64");
+                cp.importPackage("java.util.Base64");
+                b64f = "Base64.getDecoder().decode";
+            } catch (ClassNotFoundException e) {
+                try {
+                    Class.forName("javax.xml.bind.DatatypeConverter");
+                    cp.importPackage("javax.xml.bind.DatatypeConverter");
+                    b64f = "DatatypeConverter.parseBase64Binary";
+                } catch (ClassNotFoundException e1) {
+                    throw new RuntimeException(e1);
+                }
+            }
 
             int mod = Modifier.PRIVATE | Modifier.STATIC | Modifier.FINAL;
             CtClass cc = cp.get(CN_KEY_SPEC.replace('/', '.'));
@@ -40,8 +54,8 @@ public class KeyTransformer implements ClassFileTransformer {
             CtField cfNew = new CtField(cb, "__h_nk", cc);
             cfOld.setModifiers(mod);
             cfNew.setModifiers(mod);
-            cc.addField(cfOld, "DatatypeConverter.parseBase64Binary(\"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\");");
-            cc.addField(cfNew, "DatatypeConverter.parseBase64Binary(\"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\");");
+            cc.addField(cfOld, b64f + "(\"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\");");
+            cc.addField(cfNew, b64f + "(\"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\");");
             CtConstructor cm = cc.getConstructor("([B)V");
             cm.insertBeforeBody("if(Arrays.equals($1,__h_ok)){$1=__h_nk;System.out.println(\"============================== agent working ==============================\");}");