What could be the reason for encountering a java.lang.ClassNotFoundException error related to jakarta.servlet.http.HttpSessionContext when using Spring Boot 3 and Jetty server?

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The reason for encountering a java.lang.ClassNotFoundException error related to jakarta.servlet.http.HttpSessionContext when using Spring Boot 3 and Jetty server could be that the Jetty version being used is not compatible with the Jakarta EE 9 API, which includes HttpSessionContext. In order to resolve this issue, you can try upgrading the Jetty version to the latest version that is compatible with the Jakarta EE 9 API. Alternatively, you can also try downgrading the Jakarta EE API version used by your application to a version that is compatible with the Jetty server being used.