diff --git a/jero-boot/jero-cloud-module/jero-cloud-xxljob/src/main/java/com/xxl/job/admin/core/util/JacksonUtil.java b/jero-boot/jero-cloud-module/jero-cloud-xxljob/src/main/java/com/xxl/job/admin/core/util/JacksonUtil.java
index 4f4ea3cc..5f17dd41 100644
--- a/jero-boot/jero-cloud-module/jero-cloud-xxljob/src/main/java/com/xxl/job/admin/core/util/JacksonUtil.java
+++ b/jero-boot/jero-cloud-module/jero-cloud-xxljob/src/main/java/com/xxl/job/admin/core/util/JacksonUtil.java
@@ -1,9 +1,6 @@
 package com.xxl.job.admin.core.util;
 
-import com.fasterxml.jackson.core.JsonGenerationException;
-import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.databind.JavaType;
-import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -12,23 +9,26 @@ import java.io.IOException;
 
 /**
  * Jackson util
- * 
+ *
  * 1、obj need private and set/get；
  * 2、do not support inner class；
- * 
+ *
  * @author xuxueli 2015-9-25 18:02:56
  */
 public class JacksonUtil {
+	private JacksonUtil() {
+	}
+
 	private static Logger logger = LoggerFactory.getLogger(JacksonUtil.class);
 
-    private final static ObjectMapper objectMapper = new ObjectMapper();
+	private static final ObjectMapper objectMapper = new ObjectMapper();
     public static ObjectMapper getInstance() {
         return objectMapper;
     }
 
     /**
      * bean、array、List、Map --> json
-     * 
+     *
      * @param obj
      * @return json string
      * @throws Exception
@@ -36,10 +36,6 @@ public class JacksonUtil {
     public static String writeValueAsString(Object obj) {
     	try {
 			return getInstance().writeValueAsString(obj);
-		} catch (JsonGenerationException e) {
-			logger.error(e.getMessage(), e);
-		} catch (JsonMappingException e) {
-			logger.error(e.getMessage(), e);
 		} catch (IOException e) {
 			logger.error(e.getMessage(), e);
 		}
@@ -48,7 +44,7 @@ public class JacksonUtil {
 
     /**
      * string --> bean、Map、List(array)
-     * 
+     *
      * @param jsonStr
      * @param clazz
      * @return obj
@@ -57,11 +53,7 @@ public class JacksonUtil {
     public static <T> T readValue(String jsonStr, Class<T> clazz) {
     	try {
 			return getInstance().readValue(jsonStr, clazz);
-		} catch (JsonParseException e) {
-			logger.error(e.getMessage(), e);
-		} catch (JsonMappingException e) {
-			logger.error(e.getMessage(), e);
-		} catch (IOException e) {
+		}  catch (IOException e) {
 			logger.error(e.getMessage(), e);
 		}
     	return null;
@@ -80,11 +72,7 @@ public class JacksonUtil {
 		try {
 			JavaType javaType = getInstance().getTypeFactory().constructParametricType(parametrized, parameterClasses);
 			return getInstance().readValue(jsonStr, javaType);
-		} catch (JsonParseException e) {
-			logger.error(e.getMessage(), e);
-		} catch (JsonMappingException e) {
-			logger.error(e.getMessage(), e);
-		} catch (IOException e) {
+		}  catch (IOException e) {
 			logger.error(e.getMessage(), e);
 		}
 		return null;