diff --git a/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java
index 35e46a57cb..16ac66209c 100644
--- a/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java
+++ b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderBaseModule.java
@@ -267,13 +267,11 @@ public void getBeanInfo(BeanInfo beanInfo, Class<?> objectClass) {
                         }
                         break;
                     case "com.fasterxml.jackson.databind.annotation.JsonDeserialize":
-                    case "com.alibaba.fastjson2.adapter.jackson.databind.annotation.JsonDeserialize":
                         if (useJacksonAnnotation) {
                             processJacksonJsonDeserializer(beanInfo, annotation);
                         }
                         break;
                     case "com.fasterxml.jackson.annotation.JsonTypeName":
-                    case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonTypeName":
                         if (useJacksonAnnotation) {
                             processJacksonJsonTypeName(beanInfo, annotation);
                         }
@@ -787,7 +785,6 @@ public void getFieldInfo(FieldInfo fieldInfo, Class objectClass, Method method)
                 String annotationTypeName = annotationType.getName();
                 switch (annotationTypeName) {
                     case "com.fasterxml.jackson.annotation.JsonIgnore":
-                    case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonIgnore":
                         if (useJacksonAnnotation) {
                             processJacksonJsonIgnore(fieldInfo, annotation);
                         }
@@ -908,13 +905,11 @@ private void processAnnotation(FieldInfo fieldInfo, Annotation[] annotations) {
                 String annotationTypeName = annotationType.getName();
                 switch (annotationTypeName) {
                     case "com.fasterxml.jackson.annotation.JsonIgnore":
-                    case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonIgnore":
                         if (useJacksonAnnotation) {
                             processJacksonJsonIgnore(fieldInfo, annotation);
                         }
                         break;
                     case "com.fasterxml.jackson.annotation.JsonAnyGetter":
-                    case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonAnyGetter":
                         if (useJacksonAnnotation) {
                             fieldInfo.features |= FieldInfo.UNWRAPPED_MASK;
                         }
@@ -1012,9 +1007,7 @@ private void processJacksonJsonDeserialize(FieldInfo fieldInfo, Annotation annot
         private Class processUsing(Class using) {
             String usingName = using.getName();
             String noneClassName0 = "com.fasterxml.jackson.databind.JsonDeserializer$None";
-            String noneClassName1 = "com.alibaba.fastjson2.adapter.jackson.databind.JsonDeserializer$None";
             if (!noneClassName0.equals(usingName)
-                    && !noneClassName1.equals(usingName)
                     && ObjectReader.class.isAssignableFrom(using)
             ) {
                 return using;
@@ -1379,7 +1372,6 @@ private void getCreator(BeanInfo beanInfo, Class<?> objectClass, Constructor con
                     });
                     break;
                 case "com.fasterxml.jackson.annotation.JsonCreator":
-                case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonCreator":
                     if (JSONFactory.isUseJacksonAnnotation()) {
                         creatorMethod = true;
                     }
@@ -1442,7 +1434,6 @@ private void getCreator(BeanInfo beanInfo, Class<?> objectClass, Method method)
                     });
                     break;
                 case "com.fasterxml.jackson.annotation.JsonCreator":
-                case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonCreator":
                     if (JSONFactory.isUseJacksonAnnotation()) {
                         creatorMethod = true;
                         BeanUtils.annotationMethods(annotationType, m1 -> {
diff --git a/core/src/main/java/com/alibaba/fastjson2/util/BeanUtils.java b/core/src/main/java/com/alibaba/fastjson2/util/BeanUtils.java
index 3ed8b1031b..9b07d57b8f 100644
--- a/core/src/main/java/com/alibaba/fastjson2/util/BeanUtils.java
+++ b/core/src/main/java/com/alibaba/fastjson2/util/BeanUtils.java
@@ -524,7 +524,6 @@ public static void setters(Class objectClass, BeanInfo beanInfo, Class mixin, Co
 
                     switch (annotationType.getName()) {
                         case "com.fasterxml.jackson.annotation.JsonAnySetter":
-                        case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonAnySetter":
                             if (JSONFactory.isUseJacksonAnnotation()) {
                                 unwrapped.set(true);
                             }
@@ -1099,10 +1098,8 @@ private static boolean isJSONField(AnnotatedElement element) {
                 case "com.alibaba.fastjson2.annotation.JSONField":
                     return true;
                 case "com.fasterxml.jackson.annotation.JsonValue":
-                case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonValue":
                 case "com.fasterxml.jackson.annotation.JsonRawValue":
                 case "com.fasterxml.jackson.annotation.JsonProperty":
-                case "com.alibaba.fastjson2.adapter.jackson.annotation.JsonProperty":
                     if (JSONFactory.isUseJacksonAnnotation()) {
                         return true;
                     }