This article describes an easy, efficient way to manage context-aware applications with the help of metadata. We rely on CATS, our proposition for an application framework embedded on mobile devices. It is designed to host applications conforming to the SOA principles for achieving a flexible and dynamic architecture. Our framework provides non-functional capabilities for context management and for the adaptations required at context changes. In this article we focus on the use of iPOJO handlers and the advantages they bring to the OSGi technology