feat: make input and output serializable

Author: darrachequesne

src/main/java/org/springframework/data/jpa/datatables/mapping/Column.java

@@ -7,10 +7,14 @@
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 
+import java.io.Serial;
+import java.io.Serializable;
+
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
-public class Column {
+public class Column implements Serializable {
+  @Serial private static final long serialVersionUID = 5646239805793775339L;
 
   /**
    * Column's data source

src/main/java/org/springframework/data/jpa/datatables/mapping/DataTablesInput.java

@@ -5,6 +5,9 @@
 import jakarta.validation.constraints.Min;
 import jakarta.validation.constraints.NotEmpty;
 import jakarta.validation.constraints.NotNull;
+
+import java.io.Serial;
+import java.io.Serializable;
 import java.util.*;
 
 /**
@@ -13,7 +16,9 @@
  * @see <a href="https://datatables.net/manual/server-side#Sent-parameters">datatables.net reference</a>
  */
 @Data
-public class DataTablesInput {
+public class DataTablesInput implements Serializable {
+  @Serial private static final long serialVersionUID = 4977905421750437988L;
+
   /**
    * Draw counter. This is used by DataTables to ensure that the Ajax returns from server-side
    * processing requests are drawn in sequence by DataTables (Ajax requests are asynchronous and

src/main/java/org/springframework/data/jpa/datatables/mapping/DataTablesOutput.java

@@ -3,11 +3,14 @@
 import com.fasterxml.jackson.annotation.JsonView;
 import lombok.Data;
 
+import java.io.Serial;
+import java.io.Serializable;
 import java.util.Collections;
 import java.util.List;
 
 @Data
-public class DataTablesOutput<T> {
+public class DataTablesOutput<T> implements Serializable {
+  @Serial private static final long serialVersionUID = -5222336791460405793L;
 
   /**
    * The draw counter that this object is a response to - from the draw parameter sent as part of

src/main/java/org/springframework/data/jpa/datatables/mapping/Order.java

@@ -8,10 +8,14 @@
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Pattern;
 
+import java.io.Serial;
+import java.io.Serializable;
+
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
-public class Order {
+public class Order implements Serializable {
+  @Serial private static final long serialVersionUID = 4855306115483811642L;
 
   /**
    * Column to which ordering should be applied. This is an index reference to the columns array of

src/main/java/org/springframework/data/jpa/datatables/mapping/Search.java

@@ -6,10 +6,14 @@
 
 import jakarta.validation.constraints.NotNull;
 
+import java.io.Serial;
+import java.io.Serializable;
+
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
-public class Search {
+public class Search implements Serializable {
+  @Serial private static final long serialVersionUID = -9209797224565963947L;
 
   /**
    * Global search value. To be applied to all columns which have searchable as true.

src/test/java/org/springframework/data/jpa/datatables/mapping/DataTablesInputTest.java

@@ -1,7 +1,8 @@
 package org.springframework.data.jpa.datatables.mapping;
 
-import org.junit.jupiter.api.Test;;
+import org.junit.jupiter.api.Test;
 
+import java.io.*;
 import java.util.*;
 
 import static java.util.Arrays.asList;
@@ -30,4 +31,28 @@ public void testParseSearchPanes() {
                 entry("a.t.t.r.5", Set.of("7"))
         );
     }
+
+    @Test
+    public void testJavaSerialization() throws Exception {
+        DataTablesInput input = new DataTablesInput();
+        input.setDraw(1);
+        input.setStart(0);
+        input.setLength(10);
+        input.setSearch(new Search("test", false));
+        input.setOrder(Collections.singletonList(new Order(0, "asc")));
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
+            oos.writeObject(input);
+        }
+
+        try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()))) {
+            DataTablesInput deserialized = (DataTablesInput) ois.readObject();
+            assertThat(deserialized.getDraw()).isEqualTo(input.getDraw());
+            assertThat(deserialized.getStart()).isEqualTo(input.getStart());
+            assertThat(deserialized.getLength()).isEqualTo(input.getLength());
+            assertThat(deserialized.getSearch().getValue()).isEqualTo(input.getSearch().getValue());
+            assertThat(deserialized.getOrder().get(0).getColumn()).isEqualTo(input.getOrder().get(0).getColumn());
+        }
+    }
 }