Java serialization data version 5
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Use a stream format that allows the traversal of the stream without having to invoke methods specific to the objects saved in the stream. Keep the overhead low for nonversioned classes. Perform well and produce compact streams in simple cases, so that RMI can use serialization.īe able to identify and load classes that match the exact class used to write the stream. Provide default serialization for persistence and for RMI. Support bidirectional communication between different versions of a class operating in different virtual machines by:ĭefining a mechanism that allows Java classes to read streams written by older versions of the same class.ĭefining a mechanism that allows Java classes to write streams intended to be read by older versions of the same class. The stream format can be traversed without invoking class-specific methods. Serialization will handle versioning without class-specific methods to be implemented for each version. The proposed solution provides a mechanism for "automatic" handling of classes that evolve by adding fields and adding classes.
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This section describes the goals, assumptions, and a solution that attempts to address this problem by restricting the kinds of changes allowed and by carefully choosing the mechanisms. A compatible change is a change that does not affect the contract between the class and its callers. Versioning raises some fundamental questions about the identity of a class, including what constitutes a compatible change. When Java objects use serialization to save state in files, or as blobs in databases, the potential arises that the version of a class reading the data is different than the version that wrote the data. Who's Responsible for Versioning of Streams.Java Object Serialization Specification: 5 - Versioning of Serializable Objects Java Object Serialization Specification: 5 - Versioning of Serializable Objects