private NioEchoServer createEchoServer(Args args, SecurityProtocol securityProtocol) throws Exception {
        return createEchoServer(args, ListenerName.forSecurityProtocol(securityProtocol), securityProtocol);
    }
Tests invalid ssl.engine.factory plugin class
clients/src/test/java/org/apache/kafka/common/network/SslTransportLayerTest.java