@MiguelJ17332888 Pega 8.6.4 does not use Spring Boot internally, but it is built on top of the Spring Framework. Specifically, Pega 8.6.4 uses Spring Framework version 5.x (most likely around 5.2.x). If you are integrating an external Spring Boot application with Pega, make sure your Spring Boot version is compatible with Spring Framework 5.x to avoid any class conflicts or dependency issues. Spring Boot versions 2.3.x or 2.4.x typically align well with Spring Framework 5.2. To validate the Spring version used within your Pega setup, you can check the deployed Pega WAR file or the lib folder for the spring-core jar and its version. If you need to validate Spring-related behavior in your custom components (like listeners or beans), ensure you're using compatible annotations and avoid overriding Pega's internal Spring configuration.