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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

# Release 3.2: Java and C++ object re-use

In previous releases of Berkeley DB, Java DbEnv and Db objects, and C++ DbEnv and Db objects could be re-used 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 re-using these objects should be modified to create new objects instead.

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