求教c3p0的问题。

配置文件如下:
<named-config name="master"> 
  <property name="driverClass"> 
  net.sourceforge.jtds.jdbc.Driver 
  </property> 
  <property name="jdbcUrl"> 
  jdbc:jtds:sqlserver://127.0.0.1:1433/XXXX
  </property> 
  <property name="user">sa</property> 
  <property name="password">xxxx</property> 
  <property name="checkoutTimeout">30000</property>  
  <property name="idleConnectionTestPeriod">30</property>  
  <property name="acquireIncrement">5</property>  
  <property name="initialPoolSize">5</property>  
  <property name="maxIdleTime">30</property>  
  <property name="maxPoolSize">50</property>  
  <property name="minPoolSize">5</property>  
  <property name="maxStatements">20</property>  
  <property name="maxStatementsPerConnection">5</property> 
  </named-config> 
请问这是什么原因出的错，服务器开着，没有程序访问项目，都出错。
010-08-24 16:22:47 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector.run(ThreadPoolAsynchronousRunner.java:608) com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@6932fc -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
2010-08-24 16:22:48 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector.run(ThreadPoolAsynchronousRunner.java:624) com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@6932fc -- APPARENT DEADLOCK!!! Complete Status: 
Managed Threads: 3
Active Threads: 3
Active Tasks: 
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1b874e3 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0)
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1021f76 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1)
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@5f8ce8 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2)
Pending Tasks: 
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@11bdcc4
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@3ae83a
Pool thread stack traces:
Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,5,main]
java.net.PlainSocketImpl.socketConnect(Native Method)
java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
java.net.Socket.connect(Socket.java:519)
sun.reflect.GeneratedMethodAccessor323.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
net.sourceforge.jtds.jdbc.SharedSocket.createSocketForJDBC3(SharedSocket.java:289)
net.sourceforge.jtds.jdbc.SharedSocket.<init>(SharedSocket.java:250)
net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:297)
net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50)
net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:178)
com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main]com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:560)
Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main]com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:560)
请问是什么原因造成的？怎么解决呢?