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2013-03-05T23:58:14.107
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2013-03-05T23:58:14.107
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Inspired by @DataNucleus's comments, I have made a work-around in a vaguely similar spirit. The work-around set out below works for me, but I find that my underlying issue remains. All persistent entities that use a (read-only) numeric ID of an encoded key string will need to have their <code>getID()</code> method changing to use the work-around. Java code I amend my ID getter method (given earlier) to as follows: <pre><code>public Long getID() { Long loResult = DataExchange.getIDFromEKSIfIDIsNull(loID, sEncodedKey); return loResult; } </code></pre> My <code>DataExchange</code> class has the new method: <pre><code>import com.google.appengine.api.datastore.Key; import com.google.appengine.api.datastore.KeyFactory; /** * Get the ID supplied, or get it from the encoded key string if the ID is * <code>null</code>. * * This method is necessary since JDO version 3.0.1 introduces a long delay * between entity first persistence and ID availability using the DataNucleus * GAE primary key ID plug-in. * @param loID * The persistent entity ID. * This may be <code>null</code> if the entity has been persisted for the * first time but its generation is delayed (a big hello to JDO version * 3.0.1). * @param sEncodedKey * The persistent entity encoded key string. * This should be not <code>null</code> if the entity has been persisted. * @return * <ul> * <li> * If the persistent entity ID supplied is not <code>null</code> * then return it * </li> * <li> * else if the encoded key string is not <code>null</code> then extract * the ID and return it * </li> * <li> * else return <code>null</code>. * </li> * </ul> */ public static Long getIDFromEKSIfIDIsNull(Long loID, String sEncodedKey) { Long loResult = null; if (loID != null) loResult = loID; else if (sEncodedKey != null) { Key key = KeyFactory.stringToKey(sEncodedKey); if (key != null) { long loIDFromEKS = key.getId(); loResult = Long.valueOf(loIDFromEKS); } } return loResult; } </code></pre>
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1. POUnable to get ID of newly-created JDO persistent entity using GAE/J DataNucleus plug-in version 2.1.2
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1. USIan Marshall
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