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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

# Release 3.2: Java and C++ object reuse

In previous releases of Berkeley DB, Java DbEnv and Db objects, and C++ DbEnv and Db objects could be reused after they were closed, by calling open on them again. This is no longer permitted, and these objects no longer allow any operations after a close. Applications reusing these objects should be modified to create new objects instead.

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