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https://issues.apache.org/jira/browse/ARTEMIS-5690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18024509#comment-18024509
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Justin Bertram commented on ARTEMIS-5690:
-----------------------------------------
As far as I can tell this is behaving exactly like I would expect since you're
passing {{getChars}} a {{new char[0]}}. The {{getChars}} method could
theoretically be changed to perform validation to ensure the destination array
can hold the requested number of chars, but that would still result in an
exception (e.g. {{IllegalArgumentException}}).
If you pass {{new char[1]}} it works.
> ArrayIndexOutOfBoundsException in SimpleString - getChars() method
> ------------------------------------------------------------------
>
> Key: ARTEMIS-5690
> URL: https://issues.apache.org/jira/browse/ARTEMIS-5690
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Affects Versions: 2.31.2, 2.43.0
> Environment: openjdk version "21.0.8" 2025-07-15
> Reporter: Mikhail Titov
> Priority: Major
>
> I have found an ArrayIndexOutOfBoundsException bug as a result of
> fuzz-testing SimpleString - getChars() method.
> Run the following code to reproduce:
> {code:java}
> import org.apache.activemq.artemis.api.core.SimpleString;
>
> import java.util.Base64;
>
> public class ArrayIndexOutOfBoundsBug {
>
> public static void main(String[] args) {
>
> String Base64String = "AA==";
> Base64.Decoder decoder = Base64.getDecoder();
>
> String str = new String(decoder.decode(Base64String));
> SimpleString simpleStr = SimpleString.of(str);
>
> simpleStr.getChars(0, 1, new char[0], 0);
> }
> }{code}
>
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