diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/BaseReflectorFactory.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/BaseReflectorFactory.java
index 0b03371b..08f8da73 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/BaseReflectorFactory.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/BaseReflectorFactory.java
@@ -18,6 +18,7 @@ package com.mybatisflex.core.table;
 import org.apache.ibatis.reflection.ReflectorFactory;
 
 public abstract class BaseReflectorFactory implements ReflectorFactory {
+
     @Override
     public boolean isClassCacheEnabled() {
         return true;
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/IdInfo.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/IdInfo.java
index 78b3cf44..ae6b3bc5 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/IdInfo.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/IdInfo.java
@@ -23,14 +23,14 @@ public class IdInfo extends ColumnInfo {
     /**
      * id 生成策略
      */
-    private KeyType keyType  = KeyType.None;
+    private KeyType keyType;
 
     /**
-     * 若 keyType 类型是 sequence， value 则代表的是
+     * 1、若 keyType 类型是 sequence， value 则代表的是
      * sequence 序列的 sql 内容
      * 例如：select SEQ_USER_ID.nextval as id from dual
-     *
-     * 若 keyType 是 Generator，value 则代表的是使用的那个 keyGenerator 的名称
+     * <p>
+     * 2、若 keyType 是 Generator，value 则代表的是使用的那个 keyGenerator 的名称
      */
     private String value;
 
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/TableInfos.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/TableInfos.java
index 1c9da731..c905fd08 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/TableInfos.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/table/TableInfos.java
@@ -79,7 +79,6 @@ public class TableInfos {
                 return getEntityClass((Class<?>) type);
             }
         }
-
         return null;
     }
 
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/ClassUtil.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/ClassUtil.java
index 7d3810a3..96c00d5f 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/ClassUtil.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/ClassUtil.java
@@ -27,7 +27,6 @@ import java.util.List;
  */
 public class ClassUtil {
 
-
     //proxy frameworks
     private static final List<String> PROXY_CLASS_NAMES = Arrays.asList("net.sf.cglib.proxy.Factory"
             // cglib
@@ -68,8 +67,8 @@ public class ClassUtil {
 
     public static <T> T newInstance(Class<T> clazz) {
         try {
-            Constructor constructor = clazz.getDeclaredConstructor();
-            return (T) constructor.newInstance();
+            Constructor<T> constructor = clazz.getDeclaredConstructor();
+            return constructor.newInstance();
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -87,8 +86,7 @@ public class ClassUtil {
                     return (T) ret;
                 }
             }
-
-            throw new IllegalArgumentException("Can not matched constructor by paras" + Arrays.toString(paras) + " for class: " + clazz.getName());
+            throw new IllegalArgumentException("Can not find constructor by paras: \"" + Arrays.toString(paras) + "\" in class[" + clazz.getName()+"]");
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -120,40 +118,6 @@ public class ClassUtil {
     }
 
 
-    public static String buildMethodString(Method method) {
-        StringBuilder sb = new StringBuilder()
-                .append(method.getDeclaringClass().getName())
-                .append(".")
-                .append(method.getName())
-                .append("(");
-
-        Class<?>[] params = method.getParameterTypes();
-        int in = 0;
-        for (Class<?> clazz : params) {
-            sb.append(clazz.getName());
-            if (++in < params.length) {
-                sb.append(",");
-            }
-        }
-
-        return sb.append(")").toString();
-    }
-
-
-    public static boolean hasClass(String className) {
-        try {
-            Class.forName(className, false, getClassLoader());
-            return true;
-        } catch (ClassNotFoundException e) {
-            return false;
-        }
-    }
-
-
-    public static ClassLoader getClassLoader() {
-        ClassLoader ret = Thread.currentThread().getContextClassLoader();
-        return ret != null ? ret : ClassUtil.class.getClassLoader();
-    }
 
     public static List<Field> getAllFields(Class<?> cl) {
         List<Field> fields = new ArrayList<>();
@@ -161,6 +125,7 @@ public class ClassUtil {
         return fields;
     }
 
+
     private static void doGetFields(Class<?> cl, List<Field> fields) {
         if (cl == null || cl == Object.class) {
             return;