Reconstruction of Type Information from Java Bytecode for Component Compatibility
Electronic Notes in Theoretical Computer Science (ENTCS)
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Explicit declaration of provided and required features facilitates easier updates of components within an application. A necessary preconditionis that sufficient and correct meta-data about the component and its features is available. In this paper we describe a method that ensures safe OSGi bundle updates and package bindings despite potentially errorneous meta-data. It uses subtype checks on feature types, implemented as user-space enhancements ofthe standard bundle update process. The method was successfully applied in the Knopflerfish and Apache Felix frameworks and the paper discusses the general experiences with the OSGi framework gained during the implementation.