1. Does it help if you make your 1-1 relationships LAZY?
2. Does it help you change the cache isolation setting ? To do this in TopLink Essentials, you have to make a change to our Login object. To do that: you will need to use a SessionCustomizer. See: The session customizer option in the table at the following link: http://www.oracle.com/technology/products/ias/toplink/JPA/essentials/toplink-jpa-extensions.html#TopLinkCustomizationValidation you will have to call session.getLogin().setCacheTransactionIsolation(oracle.toplink.essentials.sessions.DatasourceLogin.CONCURRENT_READ_WRITE)
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