fix javadoc build

pom.xml

@@ -148,6 +148,13 @@
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-javadoc-plugin</artifactId>
 					<version>3.6.3</version>
+					<executions>
+						<execution>
+							<goals>
+								<goal>jar</goal>
+							</goals>
+						</execution>
+					</executions>
 				</plugin>
 
 				<plugin>
@@ -232,6 +239,13 @@
 				</plugin>
 			</plugins>
 		</pluginManagement>
+
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-javadoc-plugin</artifactId>
+			</plugin>
+		</plugins>
 	</build>
 
 	<dependencyManagement>
@@ -437,17 +451,6 @@
 							</execution>
 						</executions>
 					</plugin>
-					<plugin>
-						<groupId>org.apache.maven.plugins</groupId>
-						<artifactId>maven-javadoc-plugin</artifactId>
-						<executions>
-							<execution>
-								<goals>
-									<goal>jar</goal>
-								</goals>
-							</execution>
-						</executions>
-					</plugin>
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-gpg-plugin</artifactId>

unknow-server-nio/src/main/java/unknow/server/nio/NIOConnectionAbstract.java

@@ -49,6 +49,7 @@ public abstract class NIOConnectionAbstract {
 	 * create new connection
 	 * 
 	 * @param key the selectionKey
+	 * @param handler the handler
 	 */
 	protected NIOConnectionAbstract(SelectionKey key, NIOConnectionHandler handler) {
 		this.key = key;

unknow-server-nio/src/main/java/unknow/server/nio/NIOConnectionHandler.java

@@ -11,20 +11,24 @@ public interface NIOConnectionHandler {
 	/**
 	 * called after the connection is initialized
 	 * 
+	 * @param co the connection
 	 * @param sslEngine the sslEngine for ssl connection null for other
 	 * @throws InterruptedException on interrupt
 	 */
 	void onInit(NIOConnectionAbstract co, SSLEngine sslEngine) throws InterruptedException;
 
 	/**
 	 * called when the handshake process finish
+	 * 
+	 * @param sslEngine the sslEngine
 	 * @throws InterruptedException on interrupt
 	 */
 	void onHandshakeDone(SSLEngine sslEngine) throws InterruptedException;
 
 	/**
 	 * called after some data has been read
 	 * 
+	 * @param b the read buffers
 	 * @throws InterruptedException on interrupt
 	 * @throws IOException on io exception
 	 */

unknow-server-nio/src/main/java/unknow/server/nio/NIOConnectionPlain.java

@@ -22,6 +22,7 @@ public class NIOConnectionPlain extends NIOConnectionAbstract {
 	 * create new connection
 	 * 
 	 * @param key the selectionKey
+	 * @param handler the connection handler
 	 */
 	public NIOConnectionPlain(SelectionKey key, NIOConnectionHandler handler) {
 		super(key, handler);

unknow-server-nio/src/main/java/unknow/server/nio/ShutdownConnection.java

@@ -16,7 +16,6 @@ public class ShutdownConnection implements NIOConnectionHandler {
 	private final NIOServer server;
 
 	/**
-	 * @param key the selection key 
 	 * @param server the server
 	 */
 	public ShutdownConnection(NIOServer server) {