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PO"Id cannot be zero" - GoogleJsonResponseException 400 Bad Request
 

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    <p>I seem to be getting an error when trying to retrieve list using endpoint in GAE. The error is as follow:</p> <pre><code>04-08 01:01:30.145: I/System.out(14650): com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request 04-08 01:01:30.145: I/System.out(14650): { 04-08 01:01:30.145: I/System.out(14650): "code": 400, 04-08 01:01:30.145: I/System.out(14650): "errors": [ 04-08 01:01:30.145: I/System.out(14650): { 04-08 01:01:30.145: I/System.out(14650): "domain": "global", 04-08 01:01:30.145: I/System.out(14650): "message": "java.lang.IllegalArgumentException: id cannot be zero", 04-08 01:01:30.145: I/System.out(14650): "reason": "badRequest" 04-08 01:01:30.145: I/System.out(14650): } 04-08 01:01:30.145: I/System.out(14650): ], 04-08 01:01:30.145: I/System.out(14650): "message": "java.lang.IllegalArgumentException: id cannot be zero" 04-08 01:01:30.145: I/System.out(14650): } </code></pre> <p>This is the method I'm trying to use in my endpoint:</p> <pre><code>@SuppressWarnings({ "cast", "unchecked"}) public List&lt;Comercio&gt; listComercio() { EntityManager mgr = getEntityManager(); List&lt;Comercio&gt; result= new ArrayList&lt;Comercio&gt;(); try { Query query = mgr.createQuery("select c from Comercio c", Comercio.class); for (Object obj : (List&lt;Object&gt;) query.getResultList()) { result.add((Comercio) obj); } } finally { mgr.close(); } return result; } } </code></pre> <p>This is the entity class:</p> <pre><code>@Entity public class Comercio{ @Id private Long id; private String title; private String url; private String NEWSTYPE; public Comercio() { } public Long getId() { return id; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public void setNewstypeid(String newstypeid) { this.NEWSTYPE = newstypeid; } public String getNewstypeid() { return NEWSTYPE; } } </code></pre> <p>This is the AsyncTask from my android project:</p> <pre><code>public class AsyncDatastoreArticles extends CloudAsyncTask { AsyncDatastoreArticles(Home activity) { super(activity); } @Override protected void doInBackground() throws IOException { // TODO Auto-generated method stub List&lt;Comercio&gt; list = endpoint.listComercio().execute().getItems(); if (list != null) { //DO SOMETHING } } } </code></pre> <p>Please i need help.</p> <p>Thanks in advance.</p>
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