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POCan't run GWT ServiceAsync
 

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    <p>I am trying to create a asyncallback to return a list with all the customers from a GAE JDO database in app-engine. I have done a login class that works well but only returns a string. Now I am trying to get a List but I have the errors that come from:</p> <pre><code>18:05:39.219 [ERROR] [prototipov8] subtype com.google.gwt.resources.client.impl.ExternalTextResourcePrototype.ETRCallback is not default instantiable (it must have a zero-argument constructor or no constructors at all) and has no custom serializer. (reached via com.google.gwt.user.client.rpc.AsyncCallback&lt;java.util.List&lt;pt.sites.shared.model.Customer&gt;&gt;) </code></pre> <p>and </p> <pre><code>[ERROR] [prototipov8] - subtype com.google.gwt.user.client.rpc.AsyncCallback&lt;T&gt; is not instantiable </code></pre> <p>Full error:</p> <pre><code>17:54:07.268 [ERROR] [prototipov8] Unable to load module entry point class pt.info2000.sites.client.old.Main (see associated exception for details) java.lang.RuntimeException: Deferred binding failed for 'pt.info2000.sites.client.old.TableService' (did you forget to inherit a required module?) at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:53) at com.google.gwt.core.client.GWT.create(GWT.java:97) at pt.info2000.sites.client.old.Main.&lt;clinit&gt;(Main.java:30) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at com.google.gwt.dev.shell.ModuleSpace.loadClassFromSourceName(ModuleSpace.java:654) at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:363) at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200) at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:525) at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363) at java.lang.Thread.run(Unknown Source) Caused by: com.google.gwt.core.ext.UnableToCompleteException: (see previous log entries) at com.google.gwt.dev.shell.ModuleSpace.rebind(ModuleSpace.java:595) at com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate(ModuleSpace.java:455) at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:49) at com.google.gwt.core.client.GWT.create(GWT.java:97) at pt.info2000.sites.client.old.Main.&lt;clinit&gt;(Main.java:30) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at com.google.gwt.dev.shell.ModuleSpace.loadClassFromSourceName(ModuleSpace.java:654) at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:363) at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200) at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:525) at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363) at java.lang.Thread.run(Unknown Source) </code></pre> <p>The call</p> <pre><code> public static final TableServiceAsync table = GWT.create(TableService.class); </code></pre> <p>TableService</p> <pre><code>@RemoteServiceRelativePath("getObjects") public interface TableService extends RemoteService { List&lt;Customer&gt; getObjects(AsyncCallback&lt;List&lt;Customer&gt;&gt; callback); } </code></pre> <p>TableServiceAsync</p> <pre><code> public interface TableServiceAsync { void getObjects(AsyncCallback&lt;List&lt;Customer&gt;&gt; callback, AsyncCallback&lt;List&lt;Customer&gt;&gt; asyncCallback); } </code></pre> <p>Costumer.class a JDO in gae</p> <pre><code> @PersistenceCapable </code></pre> <p>public class Customer extends User implements Serializable {</p> <pre><code>/** * */ private static final long serialVersionUID = 1L; @Persistent private Date birthDate; @Persistent private int nib; @Persistent public Set&lt;Key&gt; companies; @Persistent public Set&lt;Key&gt; sugestions; @Persistent public Set&lt;Key&gt; documents; /** * @param code * @param name * @param description * @param creationDate * @param modificationDate * @param creator * @param lastModifier * @param username * @param password * @param avatar * @param activo * @param cookie * @param loginIP * @param roles * @param contacts */ public Customer(int code, String name, String description, Date creationDate, Date modificationDate, Key creator, Key lastModifier, String username, String password, Blob avatar, boolean activo, String cookie, String loginIP, Set&lt;Key&gt; roles, Set&lt;Key&gt; contacts) { super(code, name, description, creationDate, modificationDate, creator, lastModifier, username, password, avatar, activo, cookie, loginIP, roles, contacts); } public Customer() { } </code></pre> <p>I have already try to find a solution but I couldn't make it work, has anyone meet this error? Any suggestions or solutions? Thank you in advance for the time taken to read this. Any code that can help please ask.</p> <p>Edit1: I have a default constructor with no parameters and the class implements serializable, and I can serialize it. This code works in the Customer class; </p> <pre><code>Serializable c = new Customer(); </code></pre> <p>Edit2: Added requested code and the full error. Tried to pass the list to hashset but the error still persists. Didn't find any other solution.</p>
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    1. COPlease show the code where you're doing the RPC call. It seems like you're trying to send the AsyncCallback as well, which you can't.
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    2. COI added the rpc calls like requested, added some more code too and the full error message. I really can't find any solution and I would be grateful for any hint or solution.
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