Chart and plotting API for GWT

I am trying to find a chart and plotting api that can be used in GWT using java, not javascript. The only problem I am having is the ones I have found require an internet connection which where this code will go cannot have an internet connection. Does any one know of such an API? Here are that ones that I found, but again can't use. https://code.google.com/p/charts4j I know this one requires a connection. http://code.google.com/p/gwt-google-apis/wiki/VisualizationGettingStarted Not 100% sure on this one. If anyone has used it and can let me know if it requires a connection let me know. Also if anyone know how to get java swing to work in GWT that would be awesome. Thank you