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# CMP

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When using CMP with any of the application servers for which TopLink provides CMP integration (see "Application Server Support"), TopLink uses code generation to automatically configure the usage of value holder indirection ("Value Holder Indirection") for all CMR.

Note: When using EJB 3.0 persistence with OC4J, if you specify the `@Bean` annotation attribute `fetch=lazy`, TopLink uses bytecode weaving to automatically configure the usage of value holder indirection (see "Value Holder Indirection") for all container-managed relationships.