diff --git a/litemall-db/src/main/java/org/linlinjava/litemall/db/util/JsonUtil.java b/litemall-db/src/main/java/org/linlinjava/litemall/db/util/JsonUtil.java
deleted file mode 100644
index 3ac17050..00000000
--- a/litemall-db/src/main/java/org/linlinjava/litemall/db/util/JsonUtil.java
+++ /dev/null
@@ -1,84 +0,0 @@
-package org.linlinjava.litemall.db.util;
-
-import java.io.OutputStream;
-
-import com.fasterxml.jackson.annotation.JsonFilter;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
-import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.springframework.core.annotation.AnnotationUtils;
-
-public class JsonUtil {
-
-    private static Log log = LogFactory.getLog(JsonUtil.class);
-
-    private static ObjectMapper objectMapper = new ObjectMapper();
-
-    public static String stringify(Object object) {
-
-        try {
-            return objectMapper.writeValueAsString(object);
-        } catch (Exception e) {
-            log.error(e.getMessage(), e);
-        }
-
-        return null;
-    }
-
-    public static String stringify(Object object, String... properties) {
-
-        try {
-            return objectMapper
-                    .writer(new SimpleFilterProvider().addFilter(
-                            AnnotationUtils.getValue(
-                                    AnnotationUtils.findAnnotation(object.getClass(), JsonFilter.class)).toString(),
-                            SimpleBeanPropertyFilter.filterOutAllExcept(properties)))
-                    .writeValueAsString(object);
-        } catch (Exception e) {
-            log.error(e.getMessage(), e);
-        }
-
-        return null;
-    }
-
-    public static void stringify(OutputStream out, Object object) {
-
-        try {
-            objectMapper.writeValue(out, object);
-        } catch (Exception e) {
-            log.error(e.getMessage(), e);
-        }
-    }
-
-    public static void stringify(OutputStream out, Object object, String... properties) {
-
-        try {
-            objectMapper
-                    .writer(new SimpleFilterProvider().addFilter(
-                            AnnotationUtils.getValue(
-                                    AnnotationUtils.findAnnotation(object.getClass(), JsonFilter.class)).toString(),
-                            SimpleBeanPropertyFilter.filterOutAllExcept(properties)))
-                    .writeValue(out, object);
-        } catch (Exception e) {
-            log.error(e.getMessage(), e);
-        }
-    }
-
-    public static <T> T parse(String json, Class<T> clazz) {
-
-        if (json == null || json.length() == 0) {
-            return null;
-        }
-
-        try {
-            return objectMapper.readValue(json, clazz);
-        } catch (Exception e) {
-            log.error(e.getMessage(), e);
-        }
-
-        return null;
-    }
-
-}
\ No newline at end of file