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    <p>If your service methods contains POJO's they can cause you problems, they must have a zero argument constructor or no constructor defined. Also they must implement either IsSerializable or Serializable.</p> <p>You can trie to create the service manually with:</p> <pre><code>MainServiceAsync service = GWT.create(MainService.class); </code></pre> <p>And maybe post the MainService classes.</p> <p>Edited:</p> <p>This is an output from the treelogger with a deferred binding failing, and it is outputed into the console when you do a gwt compile. You can also see this output in the devmode console if you run in hosted mode. Always check the first error, because the others are most of the time caused by the first error.</p> <pre><code>Compiling module se.pathed.defa.DefaultGwtProject Scanning for additional dependencies: file:/C:/Users/Patrik/workspace/skola-workspace/DefaultGwtProject/src/se/pathed/defa/client/DefaultGwtProject.java Computing all possible rebind results for 'se.pathed.defa.client.GreetingService' Rebinding se.pathed.defa.client.GreetingService Invoking com.google.gwt.dev.javac.StandardGeneratorContext@16c6a55 Generating client proxy for remote service interface 'se.pathed.defa.client.GreetingService' [ERROR] se.pathed.defa.shared.UserBean is not default instantiable (it must have a zero-argument constructor or no constructors at all) and has no custom serializer. (reached via se.pathed.defa.shared.UserBean) [ERROR] se.pathed.defa.shared.UserBean has no available instantiable subtypes. (reached via se.pathed.defa.shared.UserBean) [ERROR] subtype se.pathed.defa.shared.UserBean is not default instantiable (it must have a zero-argument constructor or no constructors at all) and has no custom serializer. (reached via se.pathed.defa.shared.UserBean) [ERROR] Errors in 'file:/C:/Users/Patrik/workspace/skola-workspace/DefaultGwtProject/src/se/pathed/defa/client/DefaultGwtProject.java' [ERROR] Line 37: Failed to resolve 'se.pathed.defa.client.GreetingService' via deferred binding Scanning for additional dependencies: jar:file:/C:/eclipse/plugins/com.google.gwt.eclipse.sdkbundle.2.0.3_2.0.3.v201002191036/gwt-2.0.3/gwt-user.jar!/com/google/gwt/core/client/impl/SchedulerImpl.java [WARN] The following resources will not be created because they were never committed (did you forget to call commit()?) [WARN] C:\Users\Patrik\AppData\Local\Temp\gwtc301646733929273376.tmp\se.pathed.defa.DefaultGwtProject\compiler\se.pathed.defa.client.GreetingService.rpc.log [WARN] For the following type(s), generated source was never committed (did you forget to call commit()?) [WARN] se.pathed.defa.client.GreetingService_Proxy [ERROR] Cannot proceed due to previous errors </code></pre>
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    1. POFailed to create an instance of Service via deferred binding
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    1. COIf I create the serivce Manually. It faisl the same way
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    2. COAll my Beans are serializable. I added more code. I hope it clarifies things
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    3. COThe stacktrace sais that the gwt-compiler cant create your MainService, so the error is on the client side. Gwt uses its treelogger to report what whent wrong in the compilation and its there you should check. You should find the output from the treelogger right before the stacktrace.
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