fix read only field deserialize error, for issue #2532

core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderNoneDefaultConstructor.java

@@ -360,6 +360,9 @@ public T readObject(JSONReader jsonReader, Type fieldType, Object fieldName, lon
 
                 Object fieldValue = valueMap.get(fieldReader.fieldNameHash);
                 if (fieldValue != null) {
+                    if (paramReader != null) {
+                        continue;
+                    }
                     fieldReader.accept(object, fieldValue);
                 }
             }

core/src/test/java/com/alibaba/fastjson2/issues_2500/Issue2532.java

@@ -0,0 +1,33 @@
+package com.alibaba.fastjson2.issues_2500;
+
+import com.alibaba.fastjson2.JSON;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2532 {
+    String jsonString = "{\"collectionField\": [1, 2, 3]}";
+
+    class ImmutableCollectionExample {
+        private final Collection<Integer> collectionField;
+
+        public ImmutableCollectionExample(Collection<Integer> collectionField) {
+            this.collectionField = Collections.unmodifiableCollection(new ArrayList<>(collectionField));
+        }
+
+        public Collection<Integer> getCollectionField() {
+            return collectionField;
+        }
+    }
+
+    @Test
+    public void testParseObjectWithImmutableCollectionField() throws Exception {
+        ImmutableCollectionExample result = JSON.parseObject(jsonString, ImmutableCollectionExample.class);
+        assertEquals(Arrays.asList(1, 2, 3), new ArrayList<>(result.getCollectionField()));
+    }
+}