Re: GWT RPC AsyncCallBack is always failing persistently.

com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: This application is out of date, please click the refresh button on your browser. ( Blocked attempt to access interface 'com.mycompany.project.client.Connection', which is not implemented by 'com.mycompany.project.server.MySQLConnection'; this is either misconfiguration or a hack attempt )

at com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException_FieldSerializer.instantiate(IncompatibleRemoteServiceException_FieldSerializer.java:16)

at com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException_FieldSerializer.create(IncompatibleRemoteServiceException_FieldSerializer.java:25)

at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiate(SerializerBase.java:115)

at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:396)

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)

at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:216)

at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:258)

at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:412)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)

at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)

at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)

at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)

at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)

at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)

at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)

at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)

at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)

at com.google.gwt.core.client.impl.Impl.apply(Impl.java)

at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242)

at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)

at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)

at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)

at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)

at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)

at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)

at java.lang.Thread.run(Unknown Source)

This is the entire error code which appeared at the console and I'm so confused about all these errors. I have google about the error on mismatching but with no aid.

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