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implementar GIF loading
Saludos
Investigando por ahi encontre un post en el cual trataron el mismo problema
https://vaadin.com/forum#!/thread/282658
Basicamente la solucion es agregar un estilo para poder manejar el loading .
/* Server transaction indicator */.v-loading-indicator, .v-loading-indicator-delay, .v-loading-indicator-wait { position: absolute; top: 0; left: 0; width: 100%; height: 100%; margin: 0; padding: 0; opacity: 0.5; filter: alpha(opacity=50); z-index: 30000; background-color: #999999; background-repeat: no-repeat; background-position: 50%; cursor: wait;}.v-loading-indicator { background-image: url(icons/animations/loading-indicator.gif);}.v-loading-indicator-delay { background-image: url(icons/animations/loading-indicator-delay.gif);}.v-loading-indicator-wait { background-image: url(icons/animations/loading-indicator-wait.gif);}