diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	

diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
index 1e4c0f6..a845a91 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
@@ -12,7 +12,7 @@
 	 * job handler <br><br>
 	 * the return Object will be and stored
 	 * @param params
-	 * @return 
+	 * @return job status
 	 * @throws Exception
 	 */
 	public abstract JobHandleStatus execute(String... params) throws Exception;

diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
index 1e4c0f6..a845a91 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
@@ -12,7 +12,7 @@
 	 * job handler <br><br>
 	 * the return Object will be and stored
 	 * @param params
-	 * @return 
+	 * @return job status
 	 * @throws Exception
 	 */
 	public abstract JobHandleStatus execute(String... params) throws Exception;
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
index 5dd6a7b..4fa1fc0 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
@@ -103,7 +103,7 @@
 	 * support read log-file
 	 * @param triggerDate
 	 * @param trigger_log_id
-	 * @return
+	 * @return log content
 	 */
 	public static String readLog(Date triggerDate, int trigger_log_id ){
 		if (triggerDate==null || trigger_log_id<=0) {
@@ -137,7 +137,7 @@
 	/**
 	 * read log data
 	 * @param logFile
-	 * @return
+	 * @return log line content
 	 */
 	public static String readLines(File logFile){
 		BufferedReader reader = null;
@@ -167,9 +167,9 @@
 	
 	/**
 	 * read data from line num
-	 * @param sourceFile
+	 * @param logFile
 	 * @param fromLineNum
-	 * @return
+	 * @return log content
 	 * @throws Exception
 	 */
 	public static String readLinesFrom(File logFile, int fromLineNum) {  

diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
index 1e4c0f6..a845a91 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
@@ -12,7 +12,7 @@
 	 * job handler <br><br>
 	 * the return Object will be and stored
 	 * @param params
-	 * @return 
+	 * @return job status
 	 * @throws Exception
 	 */
 	public abstract JobHandleStatus execute(String... params) throws Exception;
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
index 5dd6a7b..4fa1fc0 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
@@ -103,7 +103,7 @@
 	 * support read log-file
 	 * @param triggerDate
 	 * @param trigger_log_id
-	 * @return
+	 * @return log content
 	 */
 	public static String readLog(Date triggerDate, int trigger_log_id ){
 		if (triggerDate==null || trigger_log_id<=0) {
@@ -137,7 +137,7 @@
 	/**
 	 * read log data
 	 * @param logFile
-	 * @return
+	 * @return log line content
 	 */
 	public static String readLines(File logFile){
 		BufferedReader reader = null;
@@ -167,9 +167,9 @@
 	
 	/**
 	 * read data from line num
-	 * @param sourceFile
+	 * @param logFile
 	 * @param fromLineNum
-	 * @return
+	 * @return log content
 	 * @throws Exception
 	 */
 	public static String readLinesFrom(File logFile, int fromLineNum) {  
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
index 4fd62a4..e69305c 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
@@ -64,7 +64,7 @@
 		/**
 		 * match Action by enum name
 		 * @param name
-         * @return
+         * @return action
          */
 		public static IAction matchAction(String name){
 			if (name!=null && name.trim().length()>0) {

diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
index 1e4c0f6..a845a91 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
@@ -12,7 +12,7 @@
 	 * job handler <br><br>
 	 * the return Object will be and stored
 	 * @param params
-	 * @return 
+	 * @return job status
 	 * @throws Exception
 	 */
 	public abstract JobHandleStatus execute(String... params) throws Exception;
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
index 5dd6a7b..4fa1fc0 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
@@ -103,7 +103,7 @@
 	 * support read log-file
 	 * @param triggerDate
 	 * @param trigger_log_id
-	 * @return
+	 * @return log content
 	 */
 	public static String readLog(Date triggerDate, int trigger_log_id ){
 		if (triggerDate==null || trigger_log_id<=0) {
@@ -137,7 +137,7 @@
 	/**
 	 * read log data
 	 * @param logFile
-	 * @return
+	 * @return log line content
 	 */
 	public static String readLines(File logFile){
 		BufferedReader reader = null;
@@ -167,9 +167,9 @@
 	
 	/**
 	 * read data from line num
-	 * @param sourceFile
+	 * @param logFile
 	 * @param fromLineNum
-	 * @return
+	 * @return log content
 	 * @throws Exception
 	 */
 	public static String readLinesFrom(File logFile, int fromLineNum) {  
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
index 4fd62a4..e69305c 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
@@ -64,7 +64,7 @@
 		/**
 		 * match Action by enum name
 		 * @param name
-         * @return
+         * @return action
          */
 		public static IAction matchAction(String name){
 			if (name!=null && name.trim().length()>0) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
index 2d2db18..0258133 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
@@ -51,7 +51,7 @@
 	/**
 	 * get length of string
 	 * @param str
-	 * @return
+	 * @return len of string byte
 	 */
 	public static int getByteLen(String str){
 		if (str==null || str.length()==0) {

diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
index 1e4c0f6..a845a91 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
@@ -12,7 +12,7 @@
 	 * job handler <br><br>
 	 * the return Object will be and stored
 	 * @param params
-	 * @return 
+	 * @return job status
 	 * @throws Exception
 	 */
 	public abstract JobHandleStatus execute(String... params) throws Exception;
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
index 5dd6a7b..4fa1fc0 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
@@ -103,7 +103,7 @@
 	 * support read log-file
 	 * @param triggerDate
 	 * @param trigger_log_id
-	 * @return
+	 * @return log content
 	 */
 	public static String readLog(Date triggerDate, int trigger_log_id ){
 		if (triggerDate==null || trigger_log_id<=0) {
@@ -137,7 +137,7 @@
 	/**
 	 * read log data
 	 * @param logFile
-	 * @return
+	 * @return log line content
 	 */
 	public static String readLines(File logFile){
 		BufferedReader reader = null;
@@ -167,9 +167,9 @@
 	
 	/**
 	 * read data from line num
-	 * @param sourceFile
+	 * @param logFile
 	 * @param fromLineNum
-	 * @return
+	 * @return log content
 	 * @throws Exception
 	 */
 	public static String readLinesFrom(File logFile, int fromLineNum) {  
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
index 4fd62a4..e69305c 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
@@ -64,7 +64,7 @@
 		/**
 		 * match Action by enum name
 		 * @param name
-         * @return
+         * @return action
          */
 		public static IAction matchAction(String name){
 			if (name!=null && name.trim().length()>0) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
index 2d2db18..0258133 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
@@ -51,7 +51,7 @@
 	/**
 	 * get length of string
 	 * @param str
-	 * @return
+	 * @return len of string byte
 	 */
 	public static int getByteLen(String str){
 		if (str==null || str.length()==0) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
index 7579d1f..c75b465 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
@@ -1,13 +1,13 @@
 package com.xxl.job.core.util;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.UnknownHostException;
 import java.util.Enumeration;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 /**
  * get ip
  * @author xuxueli 2016-5-22 11:38:05
@@ -17,7 +17,7 @@
 
 	/**
 	 * 获取本机ip
-	 * @return
+	 * @return ip
 	 */
 	public static String getIp() {
 		try {

diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
index 1e4c0f6..a845a91 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
@@ -12,7 +12,7 @@
 	 * job handler <br><br>
 	 * the return Object will be and stored
 	 * @param params
-	 * @return 
+	 * @return job status
 	 * @throws Exception
 	 */
 	public abstract JobHandleStatus execute(String... params) throws Exception;
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
index 5dd6a7b..4fa1fc0 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
@@ -103,7 +103,7 @@
 	 * support read log-file
 	 * @param triggerDate
 	 * @param trigger_log_id
-	 * @return
+	 * @return log content
 	 */
 	public static String readLog(Date triggerDate, int trigger_log_id ){
 		if (triggerDate==null || trigger_log_id<=0) {
@@ -137,7 +137,7 @@
 	/**
 	 * read log data
 	 * @param logFile
-	 * @return
+	 * @return log line content
 	 */
 	public static String readLines(File logFile){
 		BufferedReader reader = null;
@@ -167,9 +167,9 @@
 	
 	/**
 	 * read data from line num
-	 * @param sourceFile
+	 * @param logFile
 	 * @param fromLineNum
-	 * @return
+	 * @return log content
 	 * @throws Exception
 	 */
 	public static String readLinesFrom(File logFile, int fromLineNum) {  
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
index 4fd62a4..e69305c 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
@@ -64,7 +64,7 @@
 		/**
 		 * match Action by enum name
 		 * @param name
-         * @return
+         * @return action
          */
 		public static IAction matchAction(String name){
 			if (name!=null && name.trim().length()>0) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
index 2d2db18..0258133 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
@@ -51,7 +51,7 @@
 	/**
 	 * get length of string
 	 * @param str
-	 * @return
+	 * @return len of string byte
 	 */
 	public static int getByteLen(String str){
 		if (str==null || str.length()==0) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
index 7579d1f..c75b465 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
@@ -1,13 +1,13 @@
 package com.xxl.job.core.util;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.UnknownHostException;
 import java.util.Enumeration;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 /**
  * get ip
  * @author xuxueli 2016-5-22 11:38:05
@@ -17,7 +17,7 @@
 
 	/**
 	 * 获取本机ip
-	 * @return
+	 * @return ip
 	 */
 	public static String getIp() {
 		try {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java
index d6ffbae..e80ec6f 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java
@@ -1,16 +1,16 @@
 package com.xxl.job.core.util;
 
 
-import java.io.IOException;
-import java.util.HashMap;
-import java.util.Map;
-
 import org.codehaus.jackson.JsonGenerationException;
 import org.codehaus.jackson.JsonParseException;
 import org.codehaus.jackson.map.JsonMappingException;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.type.TypeReference;
 
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * Jackson util
  * 
@@ -29,7 +29,7 @@
      * bean、array、List、Map --> json
      * 
      * @param obj
-     * @return
+     * @return json string
      * @throws Exception
      */
     public static String writeValueAsString(Object obj) {
@@ -50,7 +50,7 @@
      * 
      * @param jsonStr
      * @param clazz
-     * @return
+     * @return obj
      * @throws Exception
      */
     public static <T> T readValue(String jsonStr, Class<T> clazz) {

diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
index b210e28..3545971 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/glue/loader/GlueLoader.java
@@ -8,8 +8,9 @@
 
 	/**
 	 * load code source by name, ensure every load is the latest.
-	 * @param name
-	 * @return
+	 * @param job_group
+	 * @param job_name
+	 * @return code source
 	 */
 	public String load(String job_group, String job_name);
 	
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
index 1e4c0f6..a845a91 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/handler/IJobHandler.java
@@ -12,7 +12,7 @@
 	 * job handler <br><br>
 	 * the return Object will be and stored
 	 * @param params
-	 * @return 
+	 * @return job status
 	 * @throws Exception
 	 */
 	public abstract JobHandleStatus execute(String... params) throws Exception;
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
index 5dd6a7b..4fa1fc0 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
@@ -103,7 +103,7 @@
 	 * support read log-file
 	 * @param triggerDate
 	 * @param trigger_log_id
-	 * @return
+	 * @return log content
 	 */
 	public static String readLog(Date triggerDate, int trigger_log_id ){
 		if (triggerDate==null || trigger_log_id<=0) {
@@ -137,7 +137,7 @@
 	/**
 	 * read log data
 	 * @param logFile
-	 * @return
+	 * @return log line content
 	 */
 	public static String readLines(File logFile){
 		BufferedReader reader = null;
@@ -167,9 +167,9 @@
 	
 	/**
 	 * read data from line num
-	 * @param sourceFile
+	 * @param logFile
 	 * @param fromLineNum
-	 * @return
+	 * @return log content
 	 * @throws Exception
 	 */
 	public static String readLinesFrom(File logFile, int fromLineNum) {  
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
index 4fd62a4..e69305c 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/router/HandlerRouter.java
@@ -64,7 +64,7 @@
 		/**
 		 * match Action by enum name
 		 * @param name
-         * @return
+         * @return action
          */
 		public static IAction matchAction(String name){
 			if (name!=null && name.trim().length()>0) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
index 2d2db18..0258133 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/ByteHexConverter.java
@@ -51,7 +51,7 @@
 	/**
 	 * get length of string
 	 * @param str
-	 * @return
+	 * @return len of string byte
 	 */
 	public static int getByteLen(String str){
 		if (str==null || str.length()==0) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
index 7579d1f..c75b465 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/IpUtil.java
@@ -1,13 +1,13 @@
 package com.xxl.job.core.util;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.UnknownHostException;
 import java.util.Enumeration;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 /**
  * get ip
  * @author xuxueli 2016-5-22 11:38:05
@@ -17,7 +17,7 @@
 
 	/**
 	 * 获取本机ip
-	 * @return
+	 * @return ip
 	 */
 	public static String getIp() {
 		try {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java
index d6ffbae..e80ec6f 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/JacksonUtil.java
@@ -1,16 +1,16 @@
 package com.xxl.job.core.util;
 
 
-import java.io.IOException;
-import java.util.HashMap;
-import java.util.Map;
-
 import org.codehaus.jackson.JsonGenerationException;
 import org.codehaus.jackson.JsonParseException;
 import org.codehaus.jackson.map.JsonMappingException;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.type.TypeReference;
 
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * Jackson util
  * 
@@ -29,7 +29,7 @@
      * bean、array、List、Map --> json
      * 
      * @param obj
-     * @return
+     * @return json string
      * @throws Exception
      */
     public static String writeValueAsString(Object obj) {
@@ -50,7 +50,7 @@
      * 
      * @param jsonStr
      * @param clazz
-     * @return
+     * @return obj
      * @throws Exception
      */
     public static <T> T readValue(String jsonStr, Class<T> clazz) {
diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/util/XxlJobNetCommUtil.java b/xxl-job-core/src/main/java/com/xxl/job/core/util/XxlJobNetCommUtil.java
index c7744ee..c97f525 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/util/XxlJobNetCommUtil.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/util/XxlJobNetCommUtil.java
@@ -34,7 +34,7 @@
     /**
      * format object to hex-json
      * @param obj
-     * @return
+     * @return result
      */
     public static String formatObj2HexJson(Object obj){
     	// obj to json
@@ -56,7 +56,7 @@
      * parse hex-json to object
      * @param hex
      * @param clazz
-     * @return
+     * @return result
      */
     public static <T> T parseHexJson2Obj(String hex, Class<T> clazz){
     	// hex to byte[]
@@ -161,7 +161,7 @@
 	/**
 	 * parse address ip:port to url http://.../ 
 	 * @param address
-	 * @return
+	 * @return result
 	 */
 	public static String addressToUrl(String address){
 		return "http://" + address + "/";