Issue #16981: `Migrate to Java 21 - [noTrailingWhitespace] not aware of string block """`

[Pankraz76]

Issue #16981: Migrate to Java 21 - [noTrailingWhitespace] not aware of string block """

• #16981
• https://github.com/checkstyle/checkstyle/blob/35367fcf1374443520909aeacb3026ba6d08e994/src/test/java/com/puppycrawl/tools/checkstyle/TreeWalkerTest.java#L415

    @Test
    public void testRequiredTokenIsEmptyIntArray() throws Exception {
        final File file = new File(temporaryFolder, "file.java");
        try (Writer writer = Files.newBufferedWriter(file.toPath(), StandardCharsets.UTF_8)) {
            final String configComment = """
                    /*
                    com.puppycrawl.tools.checkstyle.TreeWalkerTest\
                    $RequiredTokenIsEmptyIntArray
                    
                    */
                    """;
            writer.write(configComment);
        }
        final String[] expected = CommonUtil.EMPTY_STRING_ARRAY;
        verifyWithInlineConfigParserTwice(file.getPath(), expected);
    }

#16981

[Pankraz76]

I have read check documentation: https://checkstyle.org/checks/xxxxxx/nameofaffectedcheck.html I have downloaded the latest checkstyle from: https://checkstyle.org/cmdline.html#Download_and_Run I have executed the cli and showed it below, as cli describes the problem better than 1,000 words

/var/tmp $ javac YOUR_FILE.java
#[[MAKE SURE THERE IS SUCCESSFUL COMPILATION]]

/var/tmp $ cat config.xml
#[[PLACE YOUR OUTPUT HERE]]

/var/tmp $ cat YOUR_FILE.java
#[[PLACE YOU OUTPUT HERE]]

/var/tmp $ RUN_LOCALE="-Duser.language=en -Duser.country=US"
/var/tmp $ java $RUN_LOCALE -jar checkstyle-X.XX-all.jar -c config.xml YOUR_FILE.java
#[[PLACE YOUR OUTPUT HERE]]

For Windows users, please use type instead of cat and run

set RUN_LOCALE="-Duser.language=en -Duser.country=US"
java %RUN_LOCALE% -jar checkstyle-X.XX-all.jar -c config.xml YOUR_FILE.java

in place of the last 2 commands above.

---

Describe what you expect in detail.

---

Still not clear ??? see example - https://checkstyle.org/report_issue.html#How_to_report_a_bug.3F

ATTENTION: FAILURE TO FOLLOW THE ABOVE TEMPLATE WILL RESULT IN THE ISSUE BEING CLOSED.

[nrmancuso]

Please follow the bug report template, in the issue description, as is always requested

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