Worked on the apache/activemq repository to enhance the reliability of virtual topic handling by addressing a validation bug in topic names. Focused on backend development using Java, the work involved updating the regular expression logic to ensure that virtual topic names contain at least one character, preventing runtime exceptions caused by empty names. Comprehensive unit tests were added to verify the fix and guard against future regressions, supporting ongoing stability and developer confidence. No new features were introduced during this period, but the targeted bug fix contributed to lower incident rates and improved production stability for message-oriented middleware systems.