ERROR 2006 (HY000): MySQL server has gone away

mysql -uroot  -h127.0.0.1 -P8066 -p123456
mysql> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    381312122
Current database: test

java.util.NoSuchElementException: Could not create a validated object, cause: ValidateObject failed
at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1191)
at com.meidusa.amoeba.net.poolable.GenericObjectPool.borrowObject(GenericObjectPool.java:381)
at com.meidusa.amoeba.mysql.handler.CommandMessageHandler.startSession(CommandMessageHandler.java:633)
at com.meidusa.amoeba.mysql.handler.MySqlCommandDispatcher.handleMessage(MySqlCommandDispatcher.java:123)
at com.meidusa.amoeba.mysql.net.MysqlClientConnection$2.run(MysqlClientConnection.java:291)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)

<factoryConfig class="com.meidusa.amoeba.mysql.net.MysqlServerConnectionFactory">
<property name="manager">${defaultManager}</property>
<property name="sendBufferSize">64</property>
<property name="receiveBufferSize">128</property>

<!-- mysql port -->
<property name="port">3306</property>

<!-- mysql schema -->
<property name="schema">test</property>

<!-- mysql user -->
<property name="user">root</property>

<span style="color:#ff0000;"><!--  mysql password
<property name="password">password</property>
--></span>
</factoryConfig>

<span style="white-space:pre">			</span><span style="color:#ff0000;"><!--  mysql password -->
<property name="password">password</property></span>