OpenCore

Middleware abstraction layer providing foundation for rapid development and integration of open subsystems. Includes data model, persistence, business logic, web UI, and desktop application frameworks usable as POJOs or within J2EE application servers. Features persistence layer with optimistic locking, unique ID generation, and timestamp maintenance. Supports multiple databases including DB2, HSQLDB, MySQL, PostgreSQL, Oracle, and others. Provides connection pooling, transaction management, web UI framework with page inheritance, and desktop framework using SWT.