The following code fragments will cause an InstantiationException:

new DefaultCacheManager(new GlobalConfigurationBuilder().transport().transport(new JGroupsTransport(channel)).build()).getCache();

new DefaultCacheManager(new GlobalConfigurationBuilder().asyncTransportExecutor().factory(new CustomExecutorFactory(executor)).build()).getCache();

Even though the new configuration API accepts object instances for these configuration properties, they are expected to have no-arg constructors (since the old configuration API relied on this mechanism), hence the InstantiationException.