8252830: Correct missing javadoc comments in java.rmi module

Reviewed-by: dfuchs, lancea, smarks, chegar

src/java.rmi/share/classes/java/rmi/activation/ActivationGroupDesc.java

@@ -90,6 +90,7 @@ public final class ActivationGroupDesc implements Serializable {
     private Properties props;
 
     /** indicate compatibility with the Java 2 SDK v1.2 version of class */
+    @java.io.Serial
     private static final long serialVersionUID = -4936225423168276595L;
 
     /**
@@ -204,6 +205,7 @@ public final class ActivationGroupDesc implements Serializable {
      * @since 1.2
      */
     public static class CommandEnvironment implements Serializable {
+        @java.io.Serial
         private static final long serialVersionUID = 6165754737887770191L;
 
         /**
@@ -308,12 +310,17 @@ public final class ActivationGroupDesc implements Serializable {
          *
          * <p>This method reads this object's serialized form for this
          * class as follows:
-         *
          * <p>This method first invokes <code>defaultReadObject</code> on
          * the specified object input stream, and if <code>options</code>
          * is <code>null</code>, then <code>options</code> is set to a
          * zero-length array of <code>String</code>.
+         *
+         * @param  in the {@code ObjectInputStream} from which data is read
+         * @throws IOException if an I/O error occurs
+         * @throws ClassNotFoundException if a serialized class cannot be loaded
+         *
          */
+        @java.io.Serial
         private void readObject(ObjectInputStream in)
             throws IOException, ClassNotFoundException
         {

src/java.rmi/share/classes/java/rmi/activation/ActivationID.java

@@ -90,6 +90,7 @@ public class ActivationID implements Serializable {
     private transient UID uid = new UID();
 
     /** indicate compatibility with the Java 2 SDK v1.2 version of class */
+    @java.io.Serial
     private static final long serialVersionUID = -4608673054848209235L;
 
     /** an AccessControlContext with no permissions */
@@ -228,7 +229,11 @@ public class ActivationID implements Serializable {
      * java.rmi.server.RemoteObject RemoteObject}
      * <code>writeObject</code> method <b>serialData</b>
      * specification.
+     *
+     * @param  out the {@code ObjectOutputStream} to which data is written
+     * @throws IOException if an I/O error occurs
      **/
+    @java.io.Serial
     private void writeObject(ObjectOutputStream out)
         throws IOException
     {
@@ -287,7 +292,13 @@ public class ActivationID implements Serializable {
      * class corresponding to that external ref type name, in which
      * case the <code>RemoteRef</code> will be an instance of
      * that implementation-specific class.
+     *
+     * @param  in the {@code ObjectInputStream} from which data is read
+     * @throws IOException if an I/O error occurs
+     * @throws ClassNotFoundException if a serialized class cannot be loaded
+     *
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream in)
         throws IOException, ClassNotFoundException
     {

src/java.rmi/share/classes/java/rmi/server/RemoteObject.java

@@ -25,6 +25,7 @@
 
 package java.rmi.server;
 
+import java.io.IOException;
 import java.rmi.Remote;
 import java.rmi.NoSuchObjectException;
 import java.lang.reflect.Proxy;
@@ -47,6 +48,7 @@ public abstract class RemoteObject implements Remote, java.io.Serializable {
     transient protected RemoteRef ref;
 
     /** indicate compatibility with JDK 1.1.x version of class */
+    @java.io.Serial
     private static final long serialVersionUID = -3215090123894869218L;
 
     /**
@@ -357,7 +359,11 @@ public abstract class RemoteObject implements Remote, java.io.Serializable {
      * <code>"UnicastServerRef2"</code>, no data is written by the
      * <code>writeExternal</code> method or read by the
      * <code>readExternal</code> method.
+     *
+     * @param  out the {@code ObjectOutputStream} to which data is written
+     * @throws IOException if an I/O error occurs
      */
+    @java.io.Serial
     private void writeObject(java.io.ObjectOutputStream out)
         throws java.io.IOException
     {
@@ -418,7 +424,12 @@ public abstract class RemoteObject implements Remote, java.io.Serializable {
      * class corresponding to that external ref type name, in which
      * case this object's <code>ref</code> field will be set to an
      * instance of that implementation-specific class.
+     *
+     * @param  in the {@code ObjectInputStream} from which data is read
+     * @throws IOException if an I/O error occurs
+     * @throws ClassNotFoundException if a serialized class cannot be loaded
      */
+    @java.io.Serial
     private void readObject(java.io.ObjectInputStream in)
         throws java.io.IOException, java.lang.ClassNotFoundException
     {

src/java.rmi/share/classes/java/rmi/server/UnicastRemoteObject.java

@@ -24,6 +24,7 @@
  */
 package java.rmi.server;
 
+import java.io.IOException;
 import java.io.ObjectInputFilter;
 import java.rmi.*;
 import sun.rmi.server.UnicastServerRef;
@@ -195,6 +196,7 @@ public class UnicastRemoteObject extends RemoteServer {
     private RMIServerSocketFactory ssf = null;
 
     /* indicate compatibility with JDK 1.1.x version of class */
+    @java.io.Serial
     private static final long serialVersionUID = 4974527148936298033L;
 
     /**
@@ -259,7 +261,13 @@ public class UnicastRemoteObject extends RemoteServer {
 
     /**
      * Re-export the remote object when it is deserialized.
+     *
+     * @param  in the {@code ObjectInputStream} from which data is read
+     * @throws IOException if an I/O error occurs
+     * @throws ClassNotFoundException if a serialized class cannot be loaded
+     *
      */
+    @java.io.Serial
     private void readObject(java.io.ObjectInputStream in)
         throws java.io.IOException, java.lang.ClassNotFoundException
     {