Asynchronuos callback saves value but prints FAILED

I am using nested Asynchronous callbacks to save my front-end data to the back-end database. The data is being save into the tables the way i want them to, but it is printing that it failed. Here is the code:

    if(erasync == null)
        erasync = GWT.create(EntityRelationService.class);
    AsyncCallback<Void> callback = new AsyncCallback<Void>(){
        public void onFailure(Throwable caught) {
            String msg = caught.getLocalizedMessage();
             if (caught instanceof NotFoundException) {
                msg = ((NotFoundException) caught).getType()
                      + ((NotFoundException) caught).getMessage();
             }
           System.out.println("Failed" + msg);
        }
        public void onSuccess(Void result) {
                    if(erasync == null)
                        erasync = GWT.create(EntityRelationService.class);
                    AsyncCallback<Void> callbackOthers = new AsyncCallback<Void>(){
                        @Override
                        public void onFailure(Throwable caught) {
                            String msg = caught.getLocalizedMessage();
                             if (caught instanceof NotFoundException) {
                                msg = ((NotFoundException) caught).getType()
                                      + ((NotFoundException) caught).getMessage();
                             }
                           System.out.println("Failed" + msg);
caught.printStackTrace();
                        }
                        public void onSuccess(Void result) {
                            System.out.println("Success");
                        }                           
                    };
                    erasync.setEntityType(name, top, left, pname, callbackOthers);
        };
        erasync.setProject(name, callback);

Here it prints successful for the first callback, but for the nested one it says failed though it saves the value. Here is the stack that it prints for failure:

com.google.gwt.user.client.rpc.StatusCodeException: 
    at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:192)
    at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
    at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:393)
    at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    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:157)
    at com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:1713)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:165)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:264)
    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:188)
    at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
开发者_运维百科    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
    at com.google.gwt.dev.shell.BrowserChannel.reactToMessages(BrowserChannel.java:1668)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:401)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222)
    at java.lang.Thread.run(Thread.java:619)

Am i missing something?

Any input will be of great help. Thank you.

Hey I solved the problem. I was having this problem because the window was reloading and changing the status code when there were still asynchronous calls in process. I included the window reload at the end of my method and its working fine now. Thanks all.