diff --git a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java
index 6df2ff65..5d621d3d 100644
--- a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java
+++ b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java
@@ -4,12 +4,12 @@
  */
 package com.jeesite.common.utils.excel.fieldtype;
 
-import java.util.List;
-
 import com.jeesite.common.lang.StringUtils;
 import com.jeesite.modules.sys.entity.Area;
 import com.jeesite.modules.sys.utils.AreaUtils;
 
+import java.util.List;
+
 /**
  * 字段类型转换
  * @author ThinkGem
@@ -18,7 +18,7 @@ import com.jeesite.modules.sys.utils.AreaUtils;
  */
 public class AreaType implements FieldType {
 
-	private List<Area> list;
+	private final List<Area> list;
 	
 	public AreaType() {
 		list = AreaUtils.getAreaAllList();
diff --git a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java
index 6c211203..6c0cab83 100644
--- a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java
+++ b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java
@@ -4,12 +4,12 @@
  */
 package com.jeesite.common.utils.excel.fieldtype;
 
-import java.util.List;
-
 import com.jeesite.common.lang.StringUtils;
 import com.jeesite.modules.sys.entity.Company;
 import com.jeesite.modules.sys.utils.EmpUtils;
 
+import java.util.List;
+
 /**
  * 字段类型转换
  * @author ThinkGem
@@ -18,7 +18,7 @@ import com.jeesite.modules.sys.utils.EmpUtils;
  */
 public class CompanyType implements FieldType {
 
-	private List<Company> list;
+	private final List<Company> list;
 	
 	public CompanyType() {
 		list = EmpUtils.getCompanyAllList();
diff --git a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java
index d48d96b9..25d423e6 100644
--- a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java
+++ b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java
@@ -18,7 +18,7 @@ import com.jeesite.modules.sys.utils.EmpUtils;
  */
 public class OfficeType implements FieldType {
 
-	private List<Office> list;
+	private final List<Office> list;
 	
 	public OfficeType() {
 		list = EmpUtils.getOfficeAllList();
diff --git a/modules/core/src/main/java/com/jeesite/modules/sys/utils/AreaUtils.java b/modules/core/src/main/java/com/jeesite/modules/sys/utils/AreaUtils.java
index b911cebb..6e3ff6db 100644
--- a/modules/core/src/main/java/com/jeesite/modules/sys/utils/AreaUtils.java
+++ b/modules/core/src/main/java/com/jeesite/modules/sys/utils/AreaUtils.java
@@ -24,7 +24,7 @@ public class AreaUtils {
 	 * 静态内部类，延迟加载，懒汉式，线程安全的单例模式
 	 */
 	private static final class Static {
-		private static AreaService areaService = SpringUtils.getBean(AreaService.class);
+		private static final AreaService areaService = SpringUtils.getBean(AreaService.class);
 	}
 	
 	/**
diff --git a/modules/core/src/main/java/com/jeesite/modules/sys/utils/EmpUtils.java b/modules/core/src/main/java/com/jeesite/modules/sys/utils/EmpUtils.java
index f604f75f..3b6d64fd 100644
--- a/modules/core/src/main/java/com/jeesite/modules/sys/utils/EmpUtils.java
+++ b/modules/core/src/main/java/com/jeesite/modules/sys/utils/EmpUtils.java
@@ -32,9 +32,9 @@ public class EmpUtils {
 	 * 静态内部类，延迟加载，懒汉式，线程安全的单例模式
 	 */
 	private static final class Static {
-		private static OfficeService officeService = SpringUtils.getBean(OfficeService.class);
-		private static CompanyService companyService = SpringUtils.getBean(CompanyService.class);
-		private static EmployeeService employeeService = SpringUtils.getBean(EmployeeService.class);
+		private static final OfficeService officeService = SpringUtils.getBean(OfficeService.class);
+		private static final CompanyService companyService = SpringUtils.getBean(CompanyService.class);
+		private static final EmployeeService employeeService = SpringUtils.getBean(EmployeeService.class);
 	}
 	
 	/**
diff --git a/modules/core/src/main/java/com/jeesite/modules/sys/utils/LogUtils.java b/modules/core/src/main/java/com/jeesite/modules/sys/utils/LogUtils.java
index 7d537771..f7b7da5c 100644
--- a/modules/core/src/main/java/com/jeesite/modules/sys/utils/LogUtils.java
+++ b/modules/core/src/main/java/com/jeesite/modules/sys/utils/LogUtils.java
@@ -45,7 +45,7 @@ import java.util.concurrent.TimeUnit;
  */
 public class LogUtils {
 
-	private static ExecutorService logThreadPool = new ThreadPoolExecutor(5, 20,
+	private static final ExecutorService logThreadPool = new ThreadPoolExecutor(5, 20,
 			60L, TimeUnit.SECONDS, new LinkedBlockingQueue<>(),
 			new DefaultThreadFactory("log-save"));
 
@@ -53,12 +53,12 @@ public class LogUtils {
 	 * 静态内部类，延迟加载，懒汉式，线程安全的单例模式
 	 */
 	private static final class Static {
-		private static LogService logService = SpringUtils.getBean(LogService.class);
-		private static MenuService menuService = SpringUtils.getBean(MenuService.class);
+		private static final LogService logService = SpringUtils.getBean(LogService.class);
+		private static final MenuService menuService = SpringUtils.getBean(MenuService.class);
 	}
 	
 	// 参数名获取工具（尝试获取标注为@ModelAttribute注解的方法，第一个参数名一般为主键名）
-	private static ParameterNameDiscoverer pnd = new DefaultParameterNameDiscoverer();
+	private static final ParameterNameDiscoverer pnd = new DefaultParameterNameDiscoverer();
 	
 	/**
 	 * 保存日志