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Background documentation JPA Implementation Considerations  Locate the document in its SAP Library structure

Automatic Schema Generation

The JPA implementation underlying the SAP NetWeaver Application Server does not provide automatic schema generation (forward mapping). Instead, the implementation expects all database table accessed by the application to exist at runtime. This includes all join tables (helper tables) and ID generation tables.

Foreign Key Constraints

The JPA implementation underlying the SAP NetWeaver Application Server expects that there are no foreign key constraints on the database. If foreign key constraints exist, the behavior is undefined.

Versioning

Version attributes with Java type java.sql.Timestamp are not supported by the JPA implementation underlying SAP NetWeaver Application Server.

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