diff --git a/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/impl/lib.tpl b/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/impl/lib.tpl
index 91319892..f9e13db4 100644
--- a/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/impl/lib.tpl
+++ b/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/impl/lib.tpl
@@ -129,6 +129,9 @@ public class #(className(lib.code,lib.version)) {
   @JsonIgnoreProperties(ignoreUnknown=true)
   static class Argument {
     #(tabs(IndicatorGenerator.generateFields(lib.indicators),2))
+
+    Argument() throws Exception {}
+
     public static Argument convertArgument(Map<String,Object> map) throws Exception {
       if(map!=null){
         Argument arg =new Argument();
diff --git a/io.sc.platform.util/src/main/java/io/sc/platform/util/ReflectUtil.java b/io.sc.platform.util/src/main/java/io/sc/platform/util/ReflectUtil.java
index 199fb12f..740c9876 100644
--- a/io.sc.platform.util/src/main/java/io/sc/platform/util/ReflectUtil.java
+++ b/io.sc.platform.util/src/main/java/io/sc/platform/util/ReflectUtil.java
@@ -2,6 +2,7 @@ package io.sc.platform.util;
 
 import org.springframework.util.StringUtils;
 
+import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
@@ -134,4 +135,32 @@ public class ReflectUtil {
         Method method =clazz.getDeclaredMethod(methodName, innerParameterTypes);
         return (T)method.invoke(clazz, parameters);
     }
+
+    public static Object getFieldValue(Object target, String fieldName) throws IllegalAccessException {
+        if(target==null) { return null; }
+        if(!StringUtils.hasText(fieldName)) { return null; }
+        Field field =null;
+        try{
+            field =target.getClass().getDeclaredField(fieldName);
+        } catch (NoSuchFieldException e) {
+            return null;
+        }
+        if(field==null) { return null; }
+        field.setAccessible(true);
+        return field.get(target);
+    }
+
+    public static void setFieldValue(Object target, String fieldName,Object value) throws IllegalAccessException {
+        if(target==null) { return; }
+        if(!StringUtils.hasText(fieldName)) { return; }
+        Field field =null;
+        try{
+            field =target.getClass().getDeclaredField(fieldName);
+        } catch (NoSuchFieldException e) {
+            return;
+        }
+        if(field==null) { return; }
+        field.setAccessible(true);
+        field.set(target,value);
+    }
 }