# Spring demo One small application reproduces three supported error families: ```sh mvn spring-boot:run -Dspring-boot.run.profiles=mybatis mvn spring-boot:run -Dspring-boot.run.profiles=redis mvn spring-boot:run -Dspring-boot.run.profiles=npe ``` Run the same commands through `loghud_run` for incremental HUD updates. On Windows PowerShell, quote the Maven property if the shell requires it. The sibling `fixtures/` directory provides dependency-free logs for tests and UI demonstrations when Java or Maven is unavailable.