David Chandler's Journal of Java Web and Mobile Development

  • David M. Chandler

    Web app developer since 1994 and Google Cloud Platform Instructor now residing in Colorado. Besides tech, I enjoy landscape photography and share my work at ColoradoPhoto.gallery.

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AppEngine JDO tip regarding detachCopy()

Posted by David Chandler on November 11, 2009

In order to avoid JDO and/or serialization exceptions, I always call some form of persistenceManager.detachCopy() before returning objects from the Datastore back to GWT. I discovered today that you must set any non-persistent properties of the object after calling detachCopy(). My initial inclination is that detachCopy() does not copy properties annotated with @NotPersistent, but I have to do a little more testing…

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