PAX523 opened a new pull request, #3655:
URL: https://github.com/apache/logging-log4j2/pull/3655

   Fix `ArrayIndexOutOfBoundsException` on invocation of 
`Message.getFormattedMessage()` when any thread has no stack trace, which 
occurs on some JVM implementations.
   
   See issue: #3214 
   
   The mentioned method retrieves detail information about all existing threads 
and collects it in a result string. One of the information are the stack 
traces. Some JVM implementations (such as OpenJ9) have an empty stack trace of 
threads in a specific state. This, in turn, results in a 
`ArrayIndexOutOfBoundsException` if the user tries to dump all thread 
information via 
`org.apache.logging.log4j.message.ThreadDumpMessage.ThreadDumpMessage(String)`.
   
   ## Checklist
   
   * Base your changes on `2.x` branch if you are targeting Log4j 2; use `main` 
otherwise
   * `./mvnw verify` succeeds (if it fails due to code formatting issues 
reported by Spotless, simply run `./mvnw spotless:apply` and retry)
   * Non-trivial changes contain an entry file in the `src/changelog/.2.x.x` 
directory
   * Tests for the changes are provided
   * [Commits are 
signed](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits)
 (optional, but highly recommended)
   


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