SampleTeaVMSynchronousWrapper.java

public Uint8Array getArrayBuffer(String url){
        Window window = (Window)JS.getGlobal();
        final XMLHttpRequest req = window.createXMLHttpRequest();
        final Object lock = new Object();
        final boolean[] complete = new boolean[1];
        req.open("get", url, true);
        req.setOnReadyStateChange(new ReadyStateChangeHandler() {
    
            @Override
            public void stateChanged() {
                if ( req.getReadyState() == XMLHttpRequest.DONE ){
                    
                    new Thread() {
                        @Override
                        public void run() {
                            complete[0]=true;
                            synchronized(lock){
                                lock.notifyAll();
                            }
                        }
                    }.start();
                }
            }
        });
        req.setResponseType("arraybuffer");
        req.send();
    
        while (!complete[0]){
            synchronized(lock){
                try {
                    lock.wait();
                } catch (InterruptedException ex) {
                    Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    
        if (req.getResponse() == null  ){
            System.out.println(req.getAllResponseHeaders());
            System.out.println(req.getStatusText());
            System.out.println("Failed to load resource "+url);
            System.out.println("Status code was "+req.getStatus());
            return null;
        }
        
        return window.createUint8Array(
                (ArrayBuffer)req.getResponse()), req.getResponseType());
    
    }