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Random Java utility classes
1. Prefix Trie based data structure
2. An indexed map (indexed by keys or values).
3. Main class that provides start/stop functionality for standalone apps.
4. File io api's based based on callback design.
Oxygen Persistence Framework (http://oxygen.io) - highly flexible, high performance, layered object relational mapping framework with clustered loading, oosql and pluggable feature architecture. It is used in large projects already.