1. Post the definition of Person and RequestHistory. 2. There was an intermittent version of OpenJPA build that had a bug on how mapping strategies are installed and often showed up as error similar to yours. Which build version of OpenJPA are you using? Version information can be printed by: $ java -jar /path/to/openjpa.jar or $ java org.apache.openjpa.lib.conf.OpenJPAVersion
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