When Netty has some issues, it uses a logger which by default directs to the JDK logger. As shown in JBPAPP-6112, this causes issues, so I'd suggest forcing Netty to use the same logger Infinispan does. So, if Infinispan is configured with Log4J, so Netty and that can be forced by calling:

InternalLoggerFactory.setDefaultFactory(new Log4JLoggerFactory());