The Thread responsible was named ‘Thread-32′, but the last SQL it performed is unknown because the trace property is not enabled.

问题原因：sql语句运行后。长时间未返回数据，则抛出此异常，此时间再proxool.xml中有配置。例如以下（详见红色字体部分）

 <proxool>

  <alias>liveEpg</alias>

  <driver-url>jdbc:mysql://127.0.0.1:3306/liveEpg?useUnicode=true&amp;characterEncoding=UTF-8

  </driver-url>

  <driver-class>com.mysql.jdbc.Driver</driver-class>

  <driver-properties>

   <property name="user" value="http://www.mamicode.com/root" />

   <property name="password" value="http://www.mamicode.com/root" />

  </driver-properties>

  <maximum-connection-count>30</maximum-connection-count>

  <minimum-connection-count>1</minimum-connection-count>

  <maximum-active-time>900000</maximum-active-time>

  <house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>

 </proxool>