Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search connection refused at$LocalUnsafe.connect( at$HeadContext.connect( at at at at at at io.netty.bootstrap.Bootstrap$ at at io.netty.util.concurrent.SingleThreadEventExecutor$ at Source)