beginner~3h
Why ORM Exists — Persistence Fundamentals & the Impedance Mismatch
Before any JPA annotation or Hibernate feature makes sense, you need to feel the actual problem they solve: the structural mismatch between how Java thinks (objects) and how a database thinks (tables).
Learning objectives
- Explain the object-relational impedance mismatch using at least three of its five specific faces.
- Describe what persistence means and why an application needs it beyond in-memory state.
- Explain, at a mechanical level, what an ORM tool actually does between your code and JDBC.
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Why ORM Exists — Persistence Fundamentals & the Impedance Mismatch