JEditorPane.read(InputStream in, Object desc) throws ChangedCharSetException when you load an HTML file which declares encoding using <meta> tag:

<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">

Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: javax.swing.text.ChangedCharSetException
        at EditorPaneCharset.<init>(EditorPaneCharset.java:37)
        <13 internal lines>
Caused by: javax.swing.text.ChangedCharSetException
        at java.desktop/javax.swing.text.html.parser.DocumentParser.handleEmptyTag(DocumentParser.java:202)
        at java.desktop/javax.swing.text.html.parser.Parser.startTag(Parser.java:504)
        at java.desktop/javax.swing.text.html.parser.Parser.parseTag(Parser.java:2054)
        at java.desktop/javax.swing.text.html.parser.Parser.parseContent(Parser.java:2195)
        at java.desktop/javax.swing.text.html.parser.Parser.parse(Parser.java:2372)
        at java.desktop/javax.swing.text.html.parser.DocumentParser.parse(DocumentParser.java:135)
        at java.desktop/javax.swing.text.html.parser.ParserDelegator.parse(ParserDelegator.java:114)
        at java.desktop/javax.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:264)
        at java.desktop/javax.swing.JEditorPane.read(JEditorPane.java:621)
        at java.desktop/javax.swing.JEditorPane.read(JEditorPane.java:591)
        at EditorPaneCharset.<init>(EditorPaneCharset.java:31)
        ... 13 more

Java 8 does not throw ChangedCharSetException, Java 11 and later do.

Reported on behalf of rjolly: https://github.com/openjdk/jdk/pull/17567
https://mail.openjdk.org/pipermail/discuss/2024-March/006340.html
https://mail.openjdk.org/pipermail/client-libs-dev/2024-March/018311.html

To reproduce run the attached EditorPaneCharset.java:
    java EditorPaneCharset.java

For Java 8, compile the file first:
    javac EditorPaneCharset.java
    java EditorPaneCharset