Fix compilation errors

transport/src/main/java/io/netty/channel/AbstractServerChannel.java

@@ -77,10 +77,15 @@ public abstract class AbstractServerChannel extends AbstractChannel implements S
     }
 
     @Override
-    protected int doFlush() throws Exception {
+    protected int doFlush(boolean lastSpin) throws Exception {
         throw new UnsupportedOperationException();
     }
 
+    @Override
+    protected boolean inEventLoopDrivenFlush() {
+        return false;
+    }
+
     private static class NoopQueue extends AbstractQueue<Object> {
         @Override
         public boolean offer(Object e) {