Summary

The "java.desktop" module has a few implementations of the finalize() which do nothing, deprecated since Java 9, and are marked "forRemoval = true" since Java 16.

Solution

Delete three "finalize()" methods.

Specification

src/java.desktop/share/classes/java/awt/color/ICC_Profile.java

-    /**
-     * Frees the resources associated with an {@code ICC_Profile} object.
-     *
-     * @deprecated The {@code finalize} method has been deprecated. Subclasses
-     *         that override {@code finalize} in order to perform cleanup should
-     *         be modified to use alternative cleanup mechanisms and to remove
-     *         the overriding {@code finalize} method. When overriding the
-     *         {@code finalize} method, its implementation must explicitly
-     *         ensure that {@code super.finalize()} is invoked as described in
-     *         {@link Object#finalize}. See the specification for {@link
-     *         Object#finalize()} for further information about migration
-     *         options.
-     */
-    @Deprecated(since = "9", forRemoval = true)
-    @SuppressWarnings("removal")
-    protected void finalize() {
-    }


src/java.desktop/share/classes/java/awt/image/ColorModel.java

-    /**
-     * Disposes of system resources associated with this
-     * {@code ColorModel} once this {@code ColorModel} is no
-     * longer referenced.
-     *
-     * @deprecated The {@code finalize} method has been deprecated.
-     *     Subclasses that override {@code finalize} in order to perform cleanup
-     *     should be modified to use alternative cleanup mechanisms and
-     *     to remove the overriding {@code finalize} method.
-     *     When overriding the {@code finalize} method, its implementation must explicitly
-     *     ensure that {@code super.finalize()} is invoked as described in {@link Object#finalize}.
-     *     See the specification for {@link Object#finalize()} for further
-     *     information about migration options.
-     */
-    @Deprecated(since = "9", forRemoval = true)
-    @SuppressWarnings("removal")
-    public void finalize() {
-    }


src/java.desktop/share/classes/java/awt/image/IndexColorModel.java

-    /**
-     * Disposes of system resources associated with this
-     * {@code ColorModel} once this {@code ColorModel} is no
-     * longer referenced.
-     *
-     * @deprecated The {@code finalize} method has been deprecated.
-     *     Subclasses that override {@code finalize} in order to perform cleanup
-     *     should be modified to use alternative cleanup mechanisms and
-     *     to remove the overriding {@code finalize} method.
-     *     When overriding the {@code finalize} method, its implementation must explicitly
-     *     ensure that {@code super.finalize()} is invoked as described in {@link Object#finalize}.
-     *     See the specification for {@link Object#finalize()} for further
-     *     information about migration options.
-     */
-    @Deprecated(since = "9", forRemoval = true)
-    @SuppressWarnings("removal")
-    public void finalize() {
-    }

Link for convenience: https://github.com/openjdk/jdk/pull/5292/files