diff --git a/pom.xml b/pom.xml
index 97f63f0..93403e4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
         <dependency>
             <groupId>com.auth0</groupId>
             <artifactId>java-jwt</artifactId>
-            <version>3.16.0</version>
+            <version>4.0.0-beta.0</version>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
diff --git a/src/main/java/cn/langpy/kotime/config/LoadConfig.java b/src/main/java/cn/langpy/kotime/config/LoadConfig.java
index 716c832..21435d4 100644
--- a/src/main/java/cn/langpy/kotime/config/LoadConfig.java
+++ b/src/main/java/cn/langpy/kotime/config/LoadConfig.java
@@ -28,7 +28,7 @@ import java.util.logging.Logger;
 @ComponentScan("cn.langpy.kotime")
 @Configuration
 public class LoadConfig {
-    public static Logger log = Logger.getLogger(LoadConfig.class.toString());
+    private static Logger log = Logger.getLogger(LoadConfig.class.toString());
 
     @Value("${koTime.enable:true}")
     private Boolean kotimeEnable;
diff --git a/src/main/java/cn/langpy/kotime/controller/KoTimeController.java b/src/main/java/cn/langpy/kotime/controller/KoTimeController.java
index cae217f..3a93b36 100644
--- a/src/main/java/cn/langpy/kotime/controller/KoTimeController.java
+++ b/src/main/java/cn/langpy/kotime/controller/KoTimeController.java
@@ -34,7 +34,7 @@ public class KoTimeController {
     @Value("${ko-time.password:}")
     private String password;
 
-    public static Logger log = Logger.getLogger(KoTimeController.class.toString());
+    private static Logger log = Logger.getLogger(KoTimeController.class.toString());
 
     @PostMapping("/login")
     @ResponseBody
@@ -65,41 +65,48 @@ public class KoTimeController {
 
 
     @GetMapping
-    public void index(String test, HttpServletResponse response, HttpServletRequest request) throws Exception {
+    public void index(String test, HttpServletResponse response, HttpServletRequest request) {
         if (null != test) {
             return;
         }
         response.setContentType("text/html;charset=utf-8");
         ClassPathResource classPathResource = new ClassPathResource(KoConstant.kotimeViewer);
-        BufferedReader reader = new BufferedReader(new InputStreamReader(classPathResource.getInputStream(), "utf-8"));
-        PrintWriter out = response.getWriter();
-        String context = request.getContextPath();
-        if (StringUtils.hasText(Context.getConfig().getContextPath())) {
-            context = Context.getConfig().getContextPath();
-        }
-        StringBuilder stringBuilder = new StringBuilder();
-        String line = "";
-        int n = 0;
-        while ((line = reader.readLine()) != null) {
-            if (n > 14) {
-                if (line.indexOf(KoConstant.globalThreshold) > -1) {
-                    line = line.replace(KoConstant.globalThreshold, Context.getConfig().getThreshold() + "");
-                } else if (line.indexOf(KoConstant.globalNeedLogin) > -1) {
-                    line = line.replace(KoConstant.globalNeedLogin, Context.getConfig().getAuthEnable() + "");
-                } else if (line.indexOf(KoConstant.contextPath) > -1) {
-                    line = line.replace(KoConstant.contextPath, context);
-                } else if (line.indexOf(KoConstant.exceptionTitleStyle) > -1) {
-                    line = line.replace(KoConstant.exceptionTitleStyle, Context.getConfig().getExceptionEnable() == true ? "" : "display:none;");
-                }
-                stringBuilder.append(line + "\n");
-            } else {
-                stringBuilder.append(line + "\n");
+        try (
+                InputStream inputStream = classPathResource.getInputStream();
+                InputStreamReader streamReader = new InputStreamReader(inputStream, "utf-8");
+                BufferedReader reader = new BufferedReader(streamReader);
+                PrintWriter out = response.getWriter()) {
+
+            String context = request.getContextPath();
+            if (StringUtils.hasText(Context.getConfig().getContextPath())) {
+                context = Context.getConfig().getContextPath();
             }
-            n++;
+            StringBuilder stringBuilder = new StringBuilder();
+            String line = "";
+            int n = 0;
+            while ((line = reader.readLine()) != null) {
+                if (n > 14) {
+                    if (line.indexOf(KoConstant.globalThreshold) > -1) {
+                        line = line.replace(KoConstant.globalThreshold, Context.getConfig().getThreshold() + "");
+                    } else if (line.indexOf(KoConstant.globalNeedLogin) > -1) {
+                        line = line.replace(KoConstant.globalNeedLogin, Context.getConfig().getAuthEnable() + "");
+                    } else if (line.indexOf(KoConstant.contextPath) > -1) {
+                        line = line.replace(KoConstant.contextPath, context);
+                    } else if (line.indexOf(KoConstant.exceptionTitleStyle) > -1) {
+                        line = line.replace(KoConstant.exceptionTitleStyle, Context.getConfig().getExceptionEnable() == true ? "" : "display:none;");
+                    }
+                    stringBuilder.append(line + "\n");
+                } else {
+                    stringBuilder.append(line + "\n");
+                }
+                n++;
+            }
+            line = stringBuilder.toString();
+            out.write(line);
+            out.flush();
+        } catch (Exception e) {
+            e.printStackTrace();
         }
-        line = stringBuilder.toString();
-        out.write(line);
-        out.close();
     }
 
 
diff --git a/src/main/java/cn/langpy/kotime/data/DataBase.java b/src/main/java/cn/langpy/kotime/data/DataBase.java
index 1ae70b9..e06d4d5 100644
--- a/src/main/java/cn/langpy/kotime/data/DataBase.java
+++ b/src/main/java/cn/langpy/kotime/data/DataBase.java
@@ -15,7 +15,6 @@ import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.*;
 import java.util.logging.Logger;
-import java.util.stream.Collectors;
 
 import static java.util.stream.Collectors.toList;
 
@@ -25,7 +24,7 @@ import static java.util.stream.Collectors.toList;
 @Component("database")
 @Lazy
 public class DataBase implements GraphService {
-    public static Logger log = Logger.getLogger(DataBase.class.toString());
+    private static Logger log = Logger.getLogger(DataBase.class.toString());
 
     private Connection readConnection;
     private Connection writeConnection;
diff --git a/src/main/java/cn/langpy/kotime/handler/AuthHandler.java b/src/main/java/cn/langpy/kotime/handler/AuthHandler.java
index b570349..21d8fd1 100644
--- a/src/main/java/cn/langpy/kotime/handler/AuthHandler.java
+++ b/src/main/java/cn/langpy/kotime/handler/AuthHandler.java
@@ -25,7 +25,7 @@ import java.util.logging.Logger;
 @Aspect
 @Component
 public class AuthHandler {
-    public static Logger log = Logger.getLogger(AuthHandler.class.toString());
+    private static Logger log = Logger.getLogger(AuthHandler.class.toString());
 
     @Pointcut(KoConstant.authRange)
     public void preProcess() {
diff --git a/src/main/java/cn/langpy/kotime/handler/ComputeTimeHandler.java b/src/main/java/cn/langpy/kotime/handler/ComputeTimeHandler.java
index fb6f97f..5114b1b 100644
--- a/src/main/java/cn/langpy/kotime/handler/ComputeTimeHandler.java
+++ b/src/main/java/cn/langpy/kotime/handler/ComputeTimeHandler.java
@@ -16,7 +16,7 @@ import java.util.logging.Logger;
 @Aspect
 @Component
 public class ComputeTimeHandler {
-    public static Logger log = Logger.getLogger(ComputeTimeHandler.class.toString());
+    private static Logger log = Logger.getLogger(ComputeTimeHandler.class.toString());
 
     @Pointcut(KoConstant.comMethodRange)
     public void preProcess() {
diff --git a/src/main/java/cn/langpy/kotime/service/InvokedQueue.java b/src/main/java/cn/langpy/kotime/service/InvokedQueue.java
index 554fecc..00566d5 100644
--- a/src/main/java/cn/langpy/kotime/service/InvokedQueue.java
+++ b/src/main/java/cn/langpy/kotime/service/InvokedQueue.java
@@ -8,7 +8,7 @@ import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.logging.Logger;
 
 public class InvokedQueue {
-    public static Logger log = Logger.getLogger(InvokedQueue.class.toString());
+    private static Logger log = Logger.getLogger(InvokedQueue.class.toString());
 
     private volatile static ConcurrentLinkedQueue<InvokedInfo> queue = new ConcurrentLinkedQueue();
 
diff --git a/src/main/java/cn/langpy/kotime/service/KoInvokedHandler.java b/src/main/java/cn/langpy/kotime/service/KoInvokedHandler.java
index 4c0d396..1b5185b 100644
--- a/src/main/java/cn/langpy/kotime/service/KoInvokedHandler.java
+++ b/src/main/java/cn/langpy/kotime/service/KoInvokedHandler.java
@@ -12,7 +12,7 @@ import java.util.logging.Logger;
 
 @KoListener
 public final class KoInvokedHandler implements InvokedHandler {
-    public static Logger log = Logger.getLogger(KoInvokedHandler.class.toString());
+    private static Logger log = Logger.getLogger(KoInvokedHandler.class.toString());
 
 
     @Override
diff --git a/src/main/java/cn/langpy/kotime/service/MethodNodeService.java b/src/main/java/cn/langpy/kotime/service/MethodNodeService.java
index 19f77cd..ae664ba 100644
--- a/src/main/java/cn/langpy/kotime/service/MethodNodeService.java
+++ b/src/main/java/cn/langpy/kotime/service/MethodNodeService.java
@@ -14,7 +14,7 @@ import java.util.logging.Logger;
  * zhangchang
  */
 public class MethodNodeService {
-    public static Logger log = Logger.getLogger(MethodNodeService.class.toString());
+    private static Logger log = Logger.getLogger(MethodNodeService.class.toString());
 
     public static MethodNode getParentMethodNode() {
         Stack<String> stack = MethodStack.get();
diff --git a/src/main/java/cn/langpy/kotime/util/Common.java b/src/main/java/cn/langpy/kotime/util/Common.java
index f7a4538..a3352ba 100644
--- a/src/main/java/cn/langpy/kotime/util/Common.java
+++ b/src/main/java/cn/langpy/kotime/util/Common.java
@@ -24,7 +24,7 @@ import java.util.logging.Logger;
  * zhangchang
  */
 public class Common {
-    public static Logger log = Logger.getLogger(Common.class.toString());
+    private static Logger log = Logger.getLogger(Common.class.toString());
 
     final static List<Class<?>> baseTypes = Arrays.asList(Integer.class, Double.class, Float.class, String.class, Boolean.class, MultipartFile.class);
 
diff --git a/src/main/java/cn/langpy/kotime/util/Context.java b/src/main/java/cn/langpy/kotime/util/Context.java
index d933432..41f46b0 100644
--- a/src/main/java/cn/langpy/kotime/util/Context.java
+++ b/src/main/java/cn/langpy/kotime/util/Context.java
@@ -7,7 +7,6 @@ import cn.langpy.kotime.service.GraphService;
 import javax.sql.DataSource;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.ThreadPoolExecutor;
 
 /**
  * zhangchang
diff --git a/src/main/java/cn/langpy/kotime/util/DataBaseUtil.java b/src/main/java/cn/langpy/kotime/util/DataBaseUtil.java
index 67b5d22..92c9e3e 100644
--- a/src/main/java/cn/langpy/kotime/util/DataBaseUtil.java
+++ b/src/main/java/cn/langpy/kotime/util/DataBaseUtil.java
@@ -14,7 +14,7 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.logging.Logger;
 
 public class DataBaseUtil {
-    public static Logger log = Logger.getLogger(DataBaseUtil.class.toString());
+    private static Logger log = Logger.getLogger(DataBaseUtil.class.toString());
 
     static Map<String, ColumnInfo> tableInfoMap = new ConcurrentHashMap<>();
 
@@ -82,13 +82,14 @@ public class DataBaseUtil {
     public static List<Map<String, Object>> query(Connection connection, String sql, Object[] values) {
         List<Map<String, Object>> list = new ArrayList<>();
         PreparedStatement statement = null;
+        ResultSet resultSet = null;
         try {
             statement = connection.prepareStatement(sql);
             if (null != values) {
                 statement = setParams(statement, values);
             }
             final ResultSetMetaData metaData = statement.getMetaData();
-            ResultSet resultSet = statement.executeQuery();
+            resultSet = statement.executeQuery();
             List<ColumnInfo> columns = getColumns(metaData);
             while (resultSet.next()) {
                 Map<String, Object> map = new HashMap<>();
@@ -107,16 +108,24 @@ public class DataBaseUtil {
                     throwables.printStackTrace();
                 }
             }
+            if (null != resultSet) {
+                try {
+                    resultSet.close();
+                } catch (SQLException throwables) {
+                    throwables.printStackTrace();
+                }
+            }
         }
         return list;
     }
 
     public static boolean existsById(Connection connection, String sql, Object id) {
         PreparedStatement statement = null;
+        ResultSet resultSet = null;
         try {
             statement = connection.prepareStatement(sql);
             statement = setParams(statement, id);
-            ResultSet resultSet = statement.executeQuery();
+            resultSet = statement.executeQuery();
             if (resultSet.next()) {
                 return true;
             }
@@ -130,6 +139,13 @@ public class DataBaseUtil {
                     throwables.printStackTrace();
                 }
             }
+            if (null != resultSet) {
+                try {
+                    resultSet.close();
+                } catch (SQLException throwables) {
+                    throwables.printStackTrace();
+                }
+            }
         }
         return false;
     }
@@ -137,13 +153,14 @@ public class DataBaseUtil {
     public static <T> List<T> query(Connection connection, String sql, Object[] values, Class<T> c) {
         List<T> list = new ArrayList<>();
         PreparedStatement statement = null;
+        ResultSet resultSet = null;
         try {
             statement = connection.prepareStatement(sql);
             if (null != values) {
                 statement = setParams(statement, values);
             }
             final ResultSetMetaData metaData = statement.getMetaData();
-            ResultSet resultSet = statement.executeQuery();
+            resultSet = statement.executeQuery();
             List<ColumnInfo> columns = getColumns(metaData);
             Field[] fields = null;
             while (resultSet.next()) {
@@ -173,6 +190,7 @@ public class DataBaseUtil {
                     } else {
                         field.set(object, columnValue);
                     }
+                    field.setAccessible(false);
                 }
                 list.add(object);
             }
@@ -190,6 +208,14 @@ public class DataBaseUtil {
                     throwables.printStackTrace();
                 }
             }
+            if (null != resultSet) {
+                try {
+                    resultSet.close();
+                } catch (SQLException throwables) {
+                    throwables.printStackTrace();
+                }
+            }
+
         }
         return list;
     }