[common] Fix Serialize BinaryString throws NotSerializableException (#1496)

Author: wuchong

fluss-common/src/main/java/com/alibaba/fluss/row/BinarySection.java

@@ -87,15 +87,21 @@ public ByteBuffer wrapByteBuffer() {
         }
     }
 
+    /**
+     * Support Java Serialization by customize writeObject and readObject methods, because {@link
+     * MemorySegment} doesn't support Java Serialization.
+     */
     private void writeObject(ObjectOutputStream out) throws IOException {
-        out.defaultWriteObject();
         byte[] bytes = toBytes();
         out.writeInt(bytes.length);
         out.write(bytes);
     }
 
+    /**
+     * Support Java Serialization by customize writeObject and readObject methods, because {@link
+     * MemorySegment} doesn't support Java Serialization.
+     */
     private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
-        in.defaultReadObject();
         byte[] bytes = new byte[in.readInt()];
         IOUtils.readFully(in, bytes);
         pointTo(MemorySegment.wrap(bytes), 0, bytes.length);

fluss-common/src/test/java/com/alibaba/fluss/row/BinaryStringTest.java

@@ -24,6 +24,10 @@
 import org.junit.jupiter.api.TestTemplate;
 import org.junit.jupiter.api.extension.ExtendWith;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import java.math.BigDecimal;
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
@@ -146,6 +150,30 @@ public void emptyStringTest() {
         assertThat(empty.getSizeInBytes()).isEqualTo(0);
     }
 
+    @TestTemplate
+    public void testJavaSerialization() throws Exception {
+        String str = "hello world";
+        BinaryString bs = fromString(str);
+        byte[] data;
+
+        // serialization: object -> bytes
+        try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
+                ObjectOutputStream oos = new ObjectOutputStream(bos)) {
+
+            oos.writeObject(bs);
+            data = bos.toByteArray();
+        }
+
+        // deserialization：bytes -> object
+        try (ByteArrayInputStream bis = new ByteArrayInputStream(data);
+                ObjectInputStream ois = new ObjectInputStream(bis)) {
+            BinaryString deserializedString = (BinaryString) ois.readObject();
+
+            assertThat(deserializedString).isEqualTo(bs);
+            assertThat(deserializedString.toString()).isEqualTo(str);
+        }
+    }
+
     @TestTemplate
     public void compareTo() {
         assertThat(fromString("   ").compareTo(blankString(3))).isEqualTo(0);