Summary

Remove the terminally deprecated API javax.swing.plaf.synth.SynthLookAndFeel.load(URL url)

Problem

SynthLookAndFeel.load(URL) is a fragile and dangerous API. It was deprecated for removal in https://bugs.openjdk.org/browse/JDK-8300891

Solution

In JDK 21 the API was deprecated for removal. It is now appropriate to remove it.

Specification

Remove as below javax.swing.plaf.SynthLookAndFeel.load(URL url)

<     /**
<      * Loads the set of <code>SynthStyle</code>s that will be used by
<      * this <code>SynthLookAndFeel</code>. Path based resources are resolved
<      * relatively to the specified <code>URL</code> of the style. For example
<      * an <code>Image</code> would be resolved by
<      * <code>new URL(synthFile, path)</code>. Refer to
<      * <a href="doc-files/synthFileFormat.html">Synth File Format</a> for more
<      * information.
<      * <p>
<      * Whilst this API may be safe for loading local resources that are
<      * delivered with a {@code LookAndFeel} or application, and so have an
<      * equal level of trust with application code, using it to load from
<      * remote resources, particularly any which may have a lower level of
<      * trust, is strongly discouraged.
<      * The alternative mechanisms to load styles from an {@code InputStream}
<      * {@linkplain #load(InputStream, Class)}
<      * using resources co-located with the application or by providing a
<      * {@code SynthStyleFactory} to
<      * {@linkplain #setStyleFactory setStyleFactory(SynthStyleFactory)}
<      * are preferred.
<      * Consequently this method is deprecated and will be removed in a future
<      * release.
<      *
<      * @param url the <code>URL</code> to load the set of
<      *     <code>SynthStyle</code> from
<      * @throws ParseException if there is an error in parsing
<      * @throws IllegalArgumentException if synthSet is <code>null</code>
<      * @throws IOException if synthSet cannot be opened as an <code>InputStream</code>
<      * @since 1.6
<      * @deprecated Use {@link #load(InputStream, Class)} or
<      * {@link #setStyleFactory setStyleFactory(SynthStyleFactory)} instead
<      */
<     @Deprecated(since = "21", forRemoval = true)
<     public void load(URL url) throws ParseException, IOException