Warning throw when restart HBase

[King JKing]

Dear all,
When I stop and start HBase, I get this warning throw forever

Exception closing session 0x12fb9d5b5e10005 to
sun.nio.ch.SelectionKeyImpl@1fe88d
java.io.IOException: Read error rc = -1
java.nio.DirectByteBuffer[pos=0 lim=4 cap=4]
        at org.apache.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:701)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:945)
11/05/04 14:09:30 WARN zookeeper.ClientCnxn: Ignoring exception during
shutdown input
java.net.SocketException: Transport endpoint is not connected
        at sun.nio.ch.SocketChannelImpl.shutdown(Native Method)
        at 
sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:658)
        at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:378)
        at 
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:999)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
11/05/04 14:09:30 WARN zookeeper.ClientCnxn: Ignoring exception during
shutdown output
java.net.SocketException: Transport endpoint is not connected
        at sun.nio.ch.SocketChannelImpl.shutdown(Native Method)
        at 
sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:669)
        at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:386)
        at 
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1004)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)


Here is my code
        Configuration config = new Configuration(false);
        config.addResource(new Path("conf/hbase-dev.xml"));
        HTable client = new HTable(config, "Feed");

        Get get = new Get("1".getBytes());
        get.addColumn("Comment".getBytes(), "c1".getBytes());

        Result result = client.get(get);
        byte[] val = result.value();

        System.out.println("1----------------------------------------");
        System.out.println("val:" + new String(val));

        Thread.sleep(20000);

        config = new Configuration(false);
        config.addResource(new Path("conf/hbase-dev.xml"));
        client = new HTable(config, "Feed");
        result = client.get(get);
        val = result.value();

        System.out.println("2----------------------------------------");
        System.out.println("val:" + new String(val));

Could you help me?
Thank a lot for support.

Best regards,