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JDBM is a transactional persistence engine for Java. It aims to be for Java what GDBM is for Perl, Python, C, etcetera: a simple persistence engine that is lightweight and fast.
Note that JDBM's development has moved on to github - https://github.com/jankotek/JDBM3 is now the new home.
TFile is a transactional file storage (or file system) that relies on a database backend. It is modular so that different storage implementations is avalable like JDBC, Berkeley DB and JDBM.