…he more specific org.eclipse.jetty.server.handler.ContextHandler implementation. According to the [Migration Guide](https://jetty.org/docs/jetty/12/programming-guide/migration/11-to-12.html#api-changes-handler-sequence), Handler.Sequence replaced HandlerCollection and HandlerList. ContextHandlerCollection is retained for its efficient child ContextHandler selection. Unless performance considerations or the need for a more restrictive implementation justify it, a more generic implementation reduces code complexity and provides greater functional possibilities for plugins.