I run all of these just fine… There has to be something going on with your setup…?
@rhyolight can you try running these?
java -jar NAPI-Hotgym-Demo-v0.6.8-alpha.jar
java -jar breaking-news-demo-v0.6.8-alpha.jar -K<your api key>
java -jar fox-eats-demo-v0.6.8-alpha.jar -K<your api key>