diff --git a/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java b/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
index b7aff27..5452079 100644
--- a/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
+++ b/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
@@ -41,10 +41,9 @@ public class TestableClassTransformer implements ClassFileTransformer {
     private static final String CLASS_NAME_MOCK = "Mock";
 
     /**
-     * Just avoid spend time to scan those surely non-user classes Should keep these lists as tiny as possible
+     * Just avoid spend time to scan those surely non-user classes, should keep these lists as tiny as possible
      */
-    private final String[] BLACKLIST_PREFIXES = new String[] {"jdk/", "java/", "javax/", "sun/", "com/sun/",
-        "org/groovy", "org/apache/maven/", "com/alibaba/testable/", "junit/", "org/junit/", "org/testng/"};
+    private final String[] BLACKLIST_PREFIXES = new String[] { "sun/", "com/sun/" };
 
     public MockClassParser mockClassParser = new MockClassParser();
 
diff --git a/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniAccessor.java b/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniAccessor.java
index 071fc7e..47dc3b3 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniAccessor.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniAccessor.java
@@ -96,7 +96,7 @@ public class OmniAccessor {
     }
 
     private static List<String> generateMemberIndex(String basePath, Class<?> clazz) {
-        List<Field> fields = getAllFields(clazz);
+        List<Field> fields = TypeUtil.getAllFields(clazz);
         List<String> paths = new ArrayList<String>();
         for (Field f : fields) {
             if (!f.getName().startsWith(THIS_REF_PREFIX)) {
@@ -108,15 +108,6 @@ public class OmniAccessor {
         return paths;
     }
 
-    private static List<Field> getAllFields(Class<?> clazz) {
-        Class<?> rawClass = clazz.isArray() ? clazz.getComponentType() : clazz;
-        List<Field> fields = new ArrayList<Field>(Arrays.asList(rawClass.getDeclaredFields()));
-        if (rawClass.getSuperclass() != null) {
-            fields.addAll(getAllFields(rawClass.getSuperclass()));
-        }
-        return fields;
-    }
-
     private static String toPath(Field field) {
         return field.getName() + BRACE_START + field.getType().getSimpleName() + BRACE_END;
     }
diff --git a/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniConstructor.java b/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniConstructor.java
index bb25736..bd8ee1f 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniConstructor.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/tool/OmniConstructor.java
@@ -1,12 +1,19 @@
 package com.alibaba.testable.core.tool;
 
+import com.alibaba.testable.core.model.Null;
+import com.alibaba.testable.core.util.TypeUtil;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+
 /**
  * @author flin
  */
 public class OmniConstructor {
 
     public static <T> T newInstance(Class<T> clazz) {
-        return null;
+        return newInstance(clazz, isJavaAgentEnabled(clazz));
     }
 
     public static <T> void appendInstance(Object target, Class<T> clazz) {
@@ -17,4 +24,37 @@ public class OmniConstructor {
         return;
     }
 
+    private static boolean isJavaAgentEnabled(Class<?> clazz) {
+        try {
+            clazz.getDeclaredConstructor(Null.class);
+        } catch (NoSuchMethodException e) {
+            return false;
+        }
+        return true;
+    }
+
+    private static <T> T newInstance(Class<T> clazz, boolean withJavaAgent) {
+        try {
+            Constructor<?> constructor = withJavaAgent ?
+                clazz.getDeclaredConstructor(Null.class) : clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            Object ins = withJavaAgent ? constructor.newInstance(new Null()) : constructor.newInstance();
+            for (Field f : TypeUtil.getAllFields(clazz)) {
+                f.setAccessible(true);
+                if (!f.getType().isPrimitive()) {
+                    f.set(ins, newInstance(f.getType(), withJavaAgent));
+                }
+            }
+            return (T)ins;
+        } catch (NoSuchMethodException e) {
+            return null;
+        } catch (IllegalAccessException e) {
+            return null;
+        } catch (InstantiationException e) {
+            return null;
+        } catch (InvocationTargetException e) {
+            return null;
+        }
+    }
+
 }
diff --git a/testable-core/src/main/java/com/alibaba/testable/core/util/TypeUtil.java b/testable-core/src/main/java/com/alibaba/testable/core/util/TypeUtil.java
index 2dd699b..321a470 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/util/TypeUtil.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/util/TypeUtil.java
@@ -3,6 +3,9 @@ package com.alibaba.testable.core.util;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
 
 /**
  * @author flin
@@ -41,6 +44,20 @@ public class TypeUtil {
         }
     }
 
+    /**
+     * get all field from class and its parents
+     * @param clazz class contains fields
+     * @return all fields available
+     */
+    public static List<Field> getAllFields(Class<?> clazz) {
+        Class<?> rawClass = clazz.isArray() ? clazz.getComponentType() : clazz;
+        List<Field> fields = new ArrayList<Field>(Arrays.asList(rawClass.getDeclaredFields()));
+        if (rawClass.getSuperclass() != null) {
+            fields.addAll(getAllFields(rawClass.getSuperclass()));
+        }
+        return fields;
+    }
+
     /**
      * get constructor by parameter matching
      * @param clazz class to construct