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POGenerate Automatic Id IdGeneratorStrategy
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copied!<p>I'm using Goole App Engine to Build my REST API, I've already marked my class as <em>PersistenceCapable</em> and also i got defined my <strong>@PrimaryKey</strong> and also marked as <strong>@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)</strong>, also i've already EndPoints generated. but when i type in the terminal window a curl command to insert a new entity or registry it doesn't work. this is the code:</p> <pre><code> @PersistenceCapable(identityType = IdentityType.APPLICATION) class Student{ @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; private String studentName; .... .... .... } </code></pre> <hr> <p>this is the curl command and response from my local server. when i try to insert a new entity</p> <pre><code>curl -H 'Content-Type: application/json' -d'{"studentName": "myname"}' htto://localhost:8889/_ah/api/utp/v1/student </code></pre> <hr> <p>and this is the response from the local server.</p> <pre><code>"error" : { "message" : "javax.jdo.JDOFatalInternalException: El valor de llave dado para construir una identidad de SingleFieldIdentity de tipo \"class javax.jdo.identity.LongIdentity\" para la clase \"class com.alex.wserver.Student\" es nulo.\nNestedThrowables:\norg.datanucleus.exceptions.NucleusException: El valor de llave dado para construir una identidad de SingleFieldIdentity de tipo \"class javax.jdo.identity.LongIdentity\" para la clase \"class com.alex.wserver.Student\" es nulo." </code></pre> <p>i've been thinking that id was automatically generated an inserted. but that isn't happening here. Unlike of insert an id together</p> <hr> <ol> <li>are my class wrong?</li> <li>are my POST/json request Ok?</li> </ol> <p>Thanks in advance.</p>

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