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Tapestry tranforms your class at runtime. It tends to build a large constructor for the class instance. Further, an instance of the class is useless by itself, it must be wired together with its template and its sub-components.

On top of that, Tapestry keeps just once instance of each page in memory (since 5.2). It reworks the bytecode of the components so that a single instance can be shared across multiple request handling threads.

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