8259439: Apply java.io.Serial annotations in java.datatransfer

Reviewed-by: aivanov, pbansal, trebari, darcy

Author: mrserb

src/java.datatransfer/share/classes/java/awt/datatransfer/DataFlavor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -35,6 +35,7 @@
 import java.io.ObjectOutput;
 import java.io.OptionalDataException;
 import java.io.Reader;
+import java.io.Serial;
 import java.io.StringReader;
 import java.io.UnsupportedEncodingException;
 import java.nio.ByteBuffer;
@@ -111,6 +112,10 @@
  */
 public class DataFlavor implements Externalizable, Cloneable {
 
+    /**
+     * Use serialVersionUID from JDK 1.2 for interoperability.
+     */
+    @Serial
     private static final long serialVersionUID = 8367026044764648243L;
     private static final Class<InputStream> ioInputStreamClass = InputStream.class;
 

src/java.datatransfer/share/classes/java/awt/datatransfer/FlavorEvent.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,7 @@
 
 package java.awt.datatransfer;
 
+import java.io.Serial;
 import java.util.EventObject;
 
 /**
@@ -37,6 +38,10 @@
  */
 public class FlavorEvent extends EventObject {
 
+    /**
+     * Use serialVersionUID from JDK 1.5 for interoperability.
+     */
+    @Serial
     private static final long serialVersionUID = -5842664112252414548L;
 
     /**

src/java.datatransfer/share/classes/java/awt/datatransfer/MimeType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -29,6 +29,7 @@
 import java.io.IOException;
 import java.io.ObjectInput;
 import java.io.ObjectOutput;
+import java.io.Serial;
 import java.util.Locale;
 
 /**
@@ -41,11 +42,11 @@
  */
 class MimeType implements Externalizable, Cloneable {
 
-    /*
-     * serialization support
+    /**
+     * Use serialVersionUID from JDK 1.2 for interoperability.
      */
-
-    static final long serialVersionUID = -6568722458793895906L;
+    @Serial
+    private static final long serialVersionUID = -6568722458793895906L;
 
     /**
      * Constructor for externalization; this constructor should not be called

src/java.datatransfer/share/classes/java/awt/datatransfer/MimeTypeParseException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,8 @@
 
 package java.awt.datatransfer;
 
+import java.io.Serial;
+
 /**
  * A class to encapsulate MimeType parsing related exceptions.
  *
@@ -33,7 +35,10 @@
  */
 public class MimeTypeParseException extends Exception {
 
-    // use serialVersionUID from JDK 1.2.2 for interoperability
+    /**
+     * Use serialVersionUID from JDK 1.2.2 for interoperability.
+     */
+    @Serial
     private static final long serialVersionUID = -5604407764691570741L;
 
     /**

src/java.datatransfer/share/classes/java/awt/datatransfer/UnsupportedFlavorException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,8 @@
 
 package java.awt.datatransfer;
 
+import java.io.Serial;
+
 /**
  * Signals that the requested data is not supported in this flavor.
  *
@@ -34,9 +36,10 @@
  */
 public class UnsupportedFlavorException extends Exception {
 
-    /*
-     * JDK 1.1 serialVersionUID
+    /**
+     * Use serialVersionUID from JDK 1.1 for interoperability.
      */
+    @Serial
     private static final long serialVersionUID = 5383814944251665601L;
 
     /**