diff --git a/hippo4j-server/hippo4j-auth/src/main/java/cn/hippo4j/auth/filter/JWTAuthenticationFilter.java b/hippo4j-server/hippo4j-auth/src/main/java/cn/hippo4j/auth/filter/JWTAuthenticationFilter.java
index 97330e8c..a397a4cf 100644
--- a/hippo4j-server/hippo4j-auth/src/main/java/cn/hippo4j/auth/filter/JWTAuthenticationFilter.java
+++ b/hippo4j-server/hippo4j-auth/src/main/java/cn/hippo4j/auth/filter/JWTAuthenticationFilter.java
@@ -119,7 +119,7 @@ public class JWTAuthenticationFilter extends UsernamePasswordAuthenticationFilte
     /**
      * Return different echo information to the front end according to different exception types
      */
-    protected String getMessage(AuthenticationException failed) {
+    private String getMessage(AuthenticationException failed) {
         String message = "Server Error";
         if (failed instanceof UsernameNotFoundException) {
             message = "用户不存在";
diff --git a/hippo4j-server/hippo4j-auth/src/test/java/cn/hippo4j/auth/filter/JWTAuthenticationFilterTest.java b/hippo4j-server/hippo4j-auth/src/test/java/cn/hippo4j/auth/filter/JWTAuthenticationFilterTest.java
new file mode 100644
index 00000000..d5c8a4fa
--- /dev/null
+++ b/hippo4j-server/hippo4j-auth/src/test/java/cn/hippo4j/auth/filter/JWTAuthenticationFilterTest.java
@@ -0,0 +1,19 @@
+package cn.hippo4j.auth.filter;
+
+import cn.hippo4j.common.toolkit.ReflectUtil;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.security.authentication.BadCredentialsException;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+
+class JWTAuthenticationFilterTest {
+
+    @Test
+    void getMessageTest() {
+        JWTAuthenticationFilter filter = new JWTAuthenticationFilter(null);
+        Assertions.assertEquals("用户不存在", ReflectUtil.invoke(filter,
+                "getMessage", new UsernameNotFoundException("")));
+        Assertions.assertEquals("密码错误", ReflectUtil.invoke(filter,
+                "getMessage", new BadCredentialsException("")));
+    }
+}
\ No newline at end of file