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Editorial Team
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Asked: 2026-05-13T11:53:37+00:00

I am trying to run grails on google app engine using JDO, but I

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I am trying to run grails on google app engine using JDO,
but I got this:

org.codehaus.groovy.runtime.InvokerInvocationException: javax.jdo.JDOFatalUserException: No meta data for Book. Perhaps you need to run the enhancer on this class?
NestedThrowables:
org.datanucleus.exceptions.NucleusUserException: No meta data for Book. Perhaps you need to run the enhancer on this class?

I am confused, because when I did “grails app-engine package” it looks like the DataNucleus enhancer was running.

How can I fix this?

Thanks

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1 Answer

  1. Editorial Team

    Trivial fix,
    I just have to put the domain class into a package, i.e.
    grails create-domain-class packageName.Book

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