[CSV-248] CSVRecord is not Serializable.

Make field transient.

Author: garydgregory

src/changes/changes.xml

@@ -48,6 +48,7 @@
       <action issue="CSV-245" type="fix" dev="ggregory" due-to="Alex Herbert">Post 1.7 release fixes.</action>
       <action issue="CSV-252" type="fix" dev="ggregory" due-to= "Alex Herbert">Upgrade test framework to JUnit 5 Jupiter #49, #50.</action>
       <action issue="CSV-247" type="fix" dev="ggregory" due-to="Alex Herbert, Gary Gregory">A single empty header is allowed when not allowing empty column headers. #47.</action>
+      <action issue="CSV-248" type="fix" dev="ggregory" due-to="Alex Herbert">CSVRecord is not Serializable.</action>
       <action                 type="fix" dev="ggregory" due-to="Alex Herbert">Use test scope for supercsv #48.</action>
       <action                 type="update" dev="ggregory" due-to="Gary Gregory">Update tests from H2 1.4.199 to 1.4.200.</action>
       <action                 type="update" dev="ggregory" due-to="Gary Gregory">Update tests from Hamcrest 2.1 to 2.2.</action>

src/main/java/org/apache/commons/csv/CSVRecord.java

@@ -46,7 +46,7 @@ public final class CSVRecord implements Serializable, Iterable<String> {
     private final String[] values;
 
     /** The parser that originates this record. */
-    private final CSVParser parser;
+    private final transient CSVParser parser;
 
     CSVRecord(final CSVParser parser, final String[] values, final String comment, final long recordNumber,
             final long characterPosition) {

src/test/java/org/apache/commons/csv/CSVRecordTest.java

@@ -23,7 +23,9 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.ObjectOutputStream;
 import java.io.StringReader;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -58,7 +60,7 @@ record = parser.iterator().next();
             headerMap = parser.getHeaderMap();
         }
     }
-
+    
     @Test
     public void testGetInt() {
         assertEquals(values[0], record.get(0));
@@ -184,6 +186,18 @@ public void testRemoveAndAddColumns() throws IOException {
         }
     }
 
+    @Test
+    public void testSerialization() throws IOException {
+        CSVRecord shortRec;
+        try (final CSVParser parser = CSVParser.parse("a,b", CSVFormat.newFormat(','))) {
+            shortRec = parser.iterator().next();
+        }
+        final ByteArrayOutputStream out = new ByteArrayOutputStream();
+        try (ObjectOutputStream oos = new ObjectOutputStream(out)) {
+            oos.writeObject(shortRec);
+        }
+    }
+
     @Test
     public void testToMap() {
         final Map<String, String> map = this.recordWithHeader.toMap();