diff --git a/java/fory-core/src/main/java/org/apache/fory/resolver/ClassResolver.java b/java/fory-core/src/main/java/org/apache/fory/resolver/ClassResolver.java
index e53910260a..e9ed3df48a 100644
--- a/java/fory-core/src/main/java/org/apache/fory/resolver/ClassResolver.java
+++ b/java/fory-core/src/main/java/org/apache/fory/resolver/ClassResolver.java
@@ -1350,7 +1350,9 @@ public Class<? extends Serializer> getSerializerClass(Class<?> cls, boolean code
         if (serializerClass != null) {
           return serializerClass;
         }
-        if (requireJavaSerialization(cls) || useReplaceResolveSerializer(cls)) {
+        if (Externalizable.class.isAssignableFrom(cls)
+            || requireJavaSerialization(cls)
+            || useReplaceResolveSerializer(cls)) {
           return CollectionSerializers.JDKCompatibleCollectionSerializer.class;
         }
         if (!isCrossLanguage()) {
@@ -1364,7 +1366,9 @@ public Class<? extends Serializer> getSerializerClass(Class<?> cls, boolean code
         if (serializerClass != null) {
           return serializerClass;
         }
-        if (requireJavaSerialization(cls) || useReplaceResolveSerializer(cls)) {
+        if (Externalizable.class.isAssignableFrom(cls)
+            || requireJavaSerialization(cls)
+            || useReplaceResolveSerializer(cls)) {
           return MapSerializers.JDKCompatibleMapSerializer.class;
         }
         if (!isCrossLanguage()) {
diff --git a/java/fory-core/src/main/java/org/apache/fory/serializer/collection/CollectionSerializers.java b/java/fory-core/src/main/java/org/apache/fory/serializer/collection/CollectionSerializers.java
index cc77cebe27..9d33c3acef 100644
--- a/java/fory-core/src/main/java/org/apache/fory/serializer/collection/CollectionSerializers.java
+++ b/java/fory-core/src/main/java/org/apache/fory/serializer/collection/CollectionSerializers.java
@@ -19,6 +19,7 @@
 
 package org.apache.fory.serializer.collection;
 
+import java.io.Externalizable;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.reflect.Field;
@@ -60,6 +61,7 @@
 import org.apache.fory.resolver.TypeInfo;
 import org.apache.fory.resolver.TypeInfoHolder;
 import org.apache.fory.resolver.TypeResolver;
+import org.apache.fory.serializer.ExternalizableSerializer;
 import org.apache.fory.serializer.ReplaceResolveSerializer;
 import org.apache.fory.serializer.Serializer;
 import org.apache.fory.serializer.Serializers;
@@ -949,7 +951,9 @@ public JDKCompatibleCollectionSerializer(TypeResolver typeResolver, Class<T> cls
       Class<? extends Serializer> serializerType =
           ClassResolver.useReplaceResolveSerializer(cls)
               ? ReplaceResolveSerializer.class
-              : config.getDefaultJDKStreamSerializerType();
+              : Externalizable.class.isAssignableFrom(cls)
+                  ? ExternalizableSerializer.class
+                  : config.getDefaultJDKStreamSerializerType();
       serializer = Serializers.newSerializer(typeResolver, cls, serializerType);
     }
 
diff --git a/java/fory-core/src/main/java/org/apache/fory/serializer/collection/MapSerializers.java b/java/fory-core/src/main/java/org/apache/fory/serializer/collection/MapSerializers.java
index cb44da66ca..ab8688d6aa 100644
--- a/java/fory-core/src/main/java/org/apache/fory/serializer/collection/MapSerializers.java
+++ b/java/fory-core/src/main/java/org/apache/fory/serializer/collection/MapSerializers.java
@@ -19,6 +19,7 @@
 
 package org.apache.fory.serializer.collection;
 
+import java.io.Externalizable;
 import java.lang.invoke.MethodHandle;
 import java.util.Collection;
 import java.util.Collections;
@@ -43,6 +44,7 @@
 import org.apache.fory.resolver.ClassResolver;
 import org.apache.fory.resolver.TypeInfo;
 import org.apache.fory.resolver.TypeResolver;
+import org.apache.fory.serializer.ExternalizableSerializer;
 import org.apache.fory.serializer.ReplaceResolveSerializer;
 import org.apache.fory.serializer.Serializer;
 import org.apache.fory.serializer.Serializers;
@@ -459,7 +461,9 @@ public JDKCompatibleMapSerializer(TypeResolver typeResolver, Class<T> cls) {
       Class<? extends Serializer> serializerType =
           ClassResolver.useReplaceResolveSerializer(cls)
               ? ReplaceResolveSerializer.class
-              : config.getDefaultJDKStreamSerializerType();
+              : Externalizable.class.isAssignableFrom(cls)
+                  ? ExternalizableSerializer.class
+                  : config.getDefaultJDKStreamSerializerType();
       serializer = Serializers.newSerializer(typeResolver, cls, serializerType);
     }
 
diff --git a/java/fory-core/src/test/java/org/apache/fory/serializer/collection/MapSerializersTest.java b/java/fory-core/src/test/java/org/apache/fory/serializer/collection/MapSerializersTest.java
index ca594b8849..b1548c7fc4 100644
--- a/java/fory-core/src/test/java/org/apache/fory/serializer/collection/MapSerializersTest.java
+++ b/java/fory-core/src/test/java/org/apache/fory/serializer/collection/MapSerializersTest.java
@@ -26,6 +26,10 @@
 import static org.testng.Assert.assertEquals;
 
 import com.google.common.collect.ImmutableMap;
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
 import java.io.Serializable;
 import java.util.AbstractMap;
 import java.util.ArrayList;
@@ -832,6 +836,63 @@ public Object put(String key, Object value) {
     }
   }
 
+  public static class ExternalizableStringMap extends AbstractMap<String, String>
+      implements Externalizable {
+    private transient Map<String, String> data = new LinkedHashMap<>();
+
+    public ExternalizableStringMap() {}
+
+    @Override
+    public Set<Map.Entry<String, String>> entrySet() {
+      return data.entrySet();
+    }
+
+    @Override
+    public String put(String key, String value) {
+      return data.put(key, value);
+    }
+
+    @Override
+    public void writeExternal(ObjectOutput out) throws IOException {
+      out.writeInt(size());
+      for (Map.Entry<String, String> entry : entrySet()) {
+        out.writeObject(entry.getKey());
+        out.writeObject(entry.getValue());
+      }
+    }
+
+    @Override
+    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
+      data = new LinkedHashMap<>();
+      int size = in.readInt();
+      for (int i = 0; i < size; i++) {
+        put((String) in.readObject(), (String) in.readObject());
+      }
+    }
+  }
+
+  public static class ExternalizableMapHolder {
+    public Map<String, String> data = new ExternalizableStringMap();
+  }
+
+  @Test(dataProvider = "enableCodegen")
+  public void testExternalizableMapCompatibleMode(boolean enableCodegen) {
+    Fory fory =
+        builder()
+            .withLanguage(Language.JAVA)
+            .withCompatibleMode(CompatibleMode.COMPATIBLE)
+            .withCodegen(enableCodegen)
+            .requireClassRegistration(false)
+            .build();
+    ExternalizableMapHolder holder = new ExternalizableMapHolder();
+    holder.data.put("k", "v");
+
+    ExternalizableMapHolder deserialized = serDe(fory, holder);
+    Assert.assertEquals(deserialized.data.getClass(), ExternalizableStringMap.class);
+    Assert.assertEquals(deserialized.data, holder.data);
+    Assert.assertEquals(deserialized.data.get("k"), "v");
+  }
+
   @Test(dataProvider = "enableCodegen")
   public void testDefaultMapSerializer(boolean enableCodegen) {
     Fory fory =