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# Enterprise Information System (EIS) Usage

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You can use TopLink to persist Java objects to an EIS data source using a J2C adapter.

In this scenario, the application invokes EIS data source-defined operations by sending EIS interactions to the J2C adapter. Operations can take (and return) EIS records. Using TopLink EIS descriptors and mappings, you can easily map Java objects to the EIS record types supported by your J2C adapter and EIS data source.

This usage is common in applications that connect to legacy data sources and is also applicable to Web services.

For more information, see "EIS Projects".