I'm looking to tighten up some of my server-side code, but I'm having trouble properly establishing the relationship between entities. Before, I was using unencoded Strings as keys, but after reading the documentation here, I've changed them to encoded app-generated Strings.
I have two Entities, Trucks and Tweeters. What I'd like is an accessible Tweeter inside every Truck. Every truck has to have a Tweeter associated with it (there may be many Trucks with the same Tweeter), but a Tweeter may have no Trucks. Thus, the Tweeter should be the parent, and the Truck the child. I'm having lots of trouble persisting the classes in the datastore and I'm hoping someone can look over how I created the classes and detect my errors. Currently im getting a javax.jdo.JDOUserException. When I try to persist a Truck object. Here's the relevant portion of my child class, Truck: @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String key; .... @Persistent(defaultFetchGroup = "true") private Tweeter tweeter; and the parent, Tweeter: @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String key; I never set any of the keys anywhere, and based on the logs, the keys are being set as they should be. I think there must be a critical misunderstanding of the relationship on my part thats leading me to see an error regardless of what I try. I know I can use com.google.appengine.api.datastore.Key, but my classes are also used client-side by GWT, so I can't import the Key class from the GAE library. Thanks so much for the help! -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
