Why is this an issue?

In Java 15 Text Blocks are now official and can be used. The most common pattern for multiline strings in Java < 15 was to write String concatenation. Now it’s possible to do it in a more natural way using Text Blocks.

Noncompliant code example

String textBlock =
               "<html>\n" +
               "    <body>\n" +
               "        <tag>\n" +
               "        </tag>\n" +
               "    </body>\n" +
               "</html>";

Compliant solution

String textBlock = """
        <html>
            <body>
                <tag>
                </tag>
            </body>
        </html>""";

Resources