Thanks for you reply Kevin. Indeed, I used the property you mentioned. I am
new to OpenJPA and I use JBoss AS 7.1.1. Can you point me to some
documentation, how I can enable the enhancing of entities on deployment or
at runtime?

So far I installed OpenJPA 2.1.1 as a module and my module.xml looks like
this:

<module xmlns="urn:jboss:module:1.1" name="org.apache.openjpa">
    <resources>
        <resource-root path="openjpa-all-2.2.1.jar"/>
        <resource-root path="serp-1.13.1.jar"/>
    </resources>

    <dependencies>
        <module name="javax.persistence.api"/>
        <module name="javax.transaction.api"/>
        <module name="javax.validation.api"/>
        
        <module name="org.apache.log4j"/>
    </dependencies>
</module>

However, as soon as I try to access one of my entities I get the following
error:

- org.apache.openjpa.persistence.ArgumentException: This configuration
disallows runtime optimization, but the following listed types were not
enhanced at build time or at class load time with a javaagent



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