Looks like we can't reproduce the issue or there's a problem in the test case provided.
Ext GWT Premium Member
CarListings Example json error/problem - New Download - Purchase Complete Oct 31-201
500: Internal Server Error during step of load data in the ExtJs4.1 CarListings Example. Running Windows 7 with Tomcat V6. I've seen an another reports like this in early September that were closed because it was fixed in SA build 640 on September 28th. Is the build not available yet, or is this a new problem? Again I just did a clean install off a October 31st purchase.