C3P0数据库连接池死锁 com.mchange.v2.async.Thread?报错

现象描述：下午19点发布应用正常，凌晨2点碟机。碟机前一段时间 报错，错误信息为错误信息：com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@1c17bd4 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!   最后死锁造成内存溢出，tomcat挂起。

应用环境 ：Spring3.0 +ibatis+oracle   +tomcat  +linux

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"  "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
  destroy-method="close">
  <property name="driverClass" value="${driverClass}" />
  <property name="jdbcUrl" value="${jdbcUrl}" />
  <property name="user" value="${user}" />
  <property name="password" value="${password}" />
  <property name="minPoolSize" value="${minPoolSize}" />
  <property name="maxPoolSize" value="${maxPoolSize}" />
  <property name="maxIdleTime" value="300" />
  <property name="acquireIncrement" value="2" />
  <property name="maxStatements" value="0" />
  <property name="initialPoolSize" value="10" />
  <property name="idleConnectionTestPeriod" value="60" />
  <property name="acquireRetryAttempts" value="30" />
  <property name="testConnectionOnCheckout" value="false" />
</bean>
<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
  <property name="configLocation" value="classpath:orm/sqlMapConfig.xml" />
  <property name="dataSource" ref="dataSource" />
</bean>
<bean id="transactionManager"
  class="com.ai.rmsapp.transaction.RmsDataSourceTransactionManager">
  <property name="dataSource" ref="dataSource" />
</bean>

</beans>