Druid 使用的版本是1.0.7
数据库框架使用ibatis

配置如下：

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> 
      <!-- 基本属性 url、user、password -->
      <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl" />
      <property name="username" value="abcd" />
      <property name="password" value="abcd" />

      <!-- 配置初始化大小、最小、最大 -->
      <property name="initialSize" value="10" />
      <property name="minIdle" value="5" /> 
      <property name="maxActive" value="20" />

      <!-- 配置获取连接等待超时的时间 -->
      <property name="maxWait" value="60000" />

      <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
      <property name="timeBetweenEvictionRunsMillis" value="60000" />

      <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
      <property name="minEvictableIdleTimeMillis" value="300000" />

      <property name="validationQuery" value="SELECT 'x'" />
      <property name="testWhileIdle" value="true" />
      <property name="testOnBorrow" value="false" />
      <property name="testOnReturn" value="false" />

      <!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
      <property name="poolPreparedStatements" value="true" />
      <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />

      <!-- 配置监控统计拦截的filters -->
      <property name="filters" value="stat" /> 
  </bean>

错误信息如下：

101600 ERROR [http-8080-exec-2] [2014-07-04 11:13:01,585] com.alibaba.druid.pool.DruidDataSource.recycle[1206]- recyle error
java.lang.NullPointerException
at oracle.jdbc.driver.PhysicalConnection.cacheBuffer(PhysicalConnection.java:6808)
at oracle.jdbc.driver.OraclePreparedStatement.releaseBuffers(OraclePreparedStatement.java:3012)
at oracle.jdbc.driver.T4CPreparedStatement.releaseBuffers(T4CPreparedStatement.java:241)
at oracle.jdbc.driver.OraclePreparedStatement.enterImplicitCache(OraclePreparedStatement.java:3094)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.enterImplicitCache(OraclePreparedStatementWrapper.java:1588)
at com.alibaba.druid.util.OracleUtils.enterImplicitCache(OracleUtils.java:65)
at com.alibaba.druid.pool.PreparedStatementPool.put(PreparedStatementPool.java:83)
at com.alibaba.druid.pool.DruidPooledConnection.closePoolableStatement(DruidPooledConnection.java:163)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.close(DruidPooledPreparedStatement.java:201)
at com.alibaba.druid.pool.DruidConnectionHolder.reset(DruidConnectionHolder.java:233)
at com.alibaba.druid.pool.DruidDataSource.recycle(DruidDataSource.java:1162)
at com.alibaba.druid.pool.DruidPooledConnection.recycle(DruidPooledConnection.java:285)
at com.alibaba.druid.filter.FilterChainImpl.dataSource_recycle(FilterChainImpl.java:4534)
at com.alibaba.druid.filter.stat.StatFilter.dataSource_releaseConnection(StatFilter.java:646)
at com.alibaba.druid.filter.FilterChainImpl.dataSource_recycle(FilterChainImpl.java:4530)
at com.alibaba.druid.pool.DruidPooledConnection.close(DruidPooledConnection.java:233)
at org.springframework.jdbc.datasource.DataSourceUtils.doReleaseConnection(DataSourceUtils.java:286)
at org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy$TransactionAwareInvocationHandler.invoke(TransactionAwareDataSourceProxy.java:161)
at $Proxy90.close(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.ibatis.common.jdbc.logging.ConnectionLogProxy.invoke(ConnectionLogProxy.java:68)
at $Proxy91.close(Unknown Source)
at com.ibatis.sqlmap.engine.transaction.external.ExternalTransaction.close(ExternalTransaction.java:82)
at com.ibatis.sqlmap.engine.transaction.TransactionManager.end(TransactionManager.java:93)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.endTransaction(SqlMapExecutorDelegate.java:734)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.endTransaction(SqlMapSessionImpl.java:176)
at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.endTransaction(SqlMapClientImpl.java:153)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.autoEndTransaction(SqlMapExecutorDelegate.java:835)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:574)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:541)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:122)
at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:98)
at com.besttone.rws.dao.rp.RpSelfHouseDaoImpl.selectOrderReceYear(RpSelfHouseDaoImpl.java:779)
at com.besttone.rws.service.rp.RpSelfHouseServiceImpl.selectOrderReceYear(RpSelfHouseServiceImpl.java:2184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:287)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
at $Proxy42.selectOrderReceYear(Unknown Source)
at com.besttone.rws.action.sys.ApprovalProcessAction.loadHasApprovedOrder(ApprovalProcessAction.java:839)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:124)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.besttone.rws.filter.UserSessionFilter.doFilter(UserSessionFilter.java:70)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.besttone.rws.filter.CSRFFilter.doFilter(CSRFFilter.java:40)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at cn.sh.ideal.product.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:34)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:886)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2256)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)