こんばんは。
現在本番運用中のシステムで、下記メッセージが表示され接続ができずにエラーとなる事象が発生しました。ただ、再度接続するとつながるようになります。
夜間にサーバ起動後、しばらくアクセスしない時間が続いた場合に発生する、というのはわかっているのですが、対処方法が分かりません。

お知恵を拝借いたしたく、よろしくお願いします。

環境：
OS：CentOS release 6.5 (Final)
tomcat:6.0.39
apache:2.2.21
java:1.7.0_45

java.sql.SQLRecoverableException: IOエラー: Broken pipe
    at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:865)
    at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1153)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1275)
    at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1477)
    at oracle.jdbc.driver.OracleStatementWrapper.executeQuery(OracleStatementWrapper.java:392)
    at org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeQuery(DelegatingStatement.java:208)
    at org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeQuery(DelegatingStatement.java:208)
    at util.DbUtil.getResultSet(DbUtil.java:409)
    at util.DbUtil.getDataTable(DbUtil.java:466)
    at util.DbUtil.getDataTable(DbUtil.java:441)
    at page.logic.BusinessLogic.getOlf(BusinessLogic.java:51)
    at page.common.Common.checkPreCondtion(Common.java:106)
    at page.action.AbstractAction.checkPreCondition(AbstractAction.java:64)
    at framework.action.AbstractAction.doAction(AbstractAction.java:460)
    at framework.action.AbstractAction.index(AbstractAction.java:183)
    at page.action.Am001011Action$$EnhancedByS2AOP$$4f65cbd2.$$index$$invokeSuperMethod$$(Am001011Action$$EnhancedByS2AOP$$4f65cbd2.java)
    at page.action.Am001011Action$$EnhancedByS2AOP$$4f65cbd2$$MethodInvocation$$index5.proceed(MethodInvocationClassGenerator.java)
    at org.seasar.extension.tx.DefaultTransactionCallback.execute(DefaultTransactionCallback.java:58)
    at org.seasar.extension.tx.adapter.JTATransactionManagerAdapter.required(JTATransactionManagerAdapter.java:65)
    at org.seasar.extension.tx.RequiredInterceptor.invoke(RequiredInterceptor.java:50)
    at page.action.Am001011Action$$EnhancedByS2AOP$$4f65cbd2$$MethodInvocation$$index5.proceed(MethodInvocationClassGenerator.java)
    at org.seasar.framework.aop.interceptors.ThrowsInterceptor.invoke(ThrowsInterceptor.java:79)
    at page.action.Am001011Action$$EnhancedByS2AOP$$4f65cbd2$$MethodInvocation$$index5.proceed(MethodInvocationClassGenerator.java)
    at org.seasar.framework.aop.interceptors.TraceInterceptor.invoke(TraceInterceptor.java:56)
    at page.action.Am001011Action$$EnhancedByS2AOP$$4f65cbd2$$MethodInvocation$$index5.proceed(MethodInvocationClassGenerator.java)
    at page.action.Am001011Action$$EnhancedByS2AOP$$4f65cbd2.index(Am001011Action$$EnhancedByS2AOP$$4f65cbd2.java)
    at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.seasar.framework.util.MethodUtil.invoke(MethodUtil.java:96)
    at org.seasar.struts.action.ActionWrapper.execute(ActionWrapper.java:139)
    at org.seasar.struts.action.ActionWrapper.execute(ActionWrapper.java:87)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
    at org.seasar.struts.action.S2RequestProcessor.process(S2RequestProcessor.java:132)
    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:723)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.extension.filter.RequestDumpFilter.doFilter(RequestDumpFilter.java:127)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.framework.container.filter.S2ContainerFilter.doFilter(S2ContainerFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.framework.container.hotdeploy.HotdeployFilter.doFilter(HotdeployFilter.java:71)
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
    at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
    at org.seasar.struts.action.S2RequestProcessor.doForward(S2RequestProcessor.java:306)
    at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
    at org.seasar.struts.action.S2RequestProcessor.process(S2RequestProcessor.java:134)
    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:723)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.extension.filter.RequestDumpFilter.doFilter(RequestDumpFilter.java:127)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.framework.container.filter.S2ContainerFilter.doFilter(S2ContainerFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.framework.container.hotdeploy.HotdeployFilter.doFilter(HotdeployFilter.java:71)
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
    at org.seasar.struts.filter.RoutingFilter.forward(RoutingFilter.java:219)
    at org.seasar.struts.filter.RoutingFilter.doFilter(RoutingFilter.java:152)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.framework.container.filter.S2ContainerFilter.doFilter(S2ContainerFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.framework.container.hotdeploy.HotdeployFilter.doFilter(HotdeployFilter.java:71)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.seasar.extension.filter.EncodingFilter.doFilter(EncodingFilter.java:69)
    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:103)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
    at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:311)
    at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)
    at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
    at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.net.SocketException: Broken pipe
    at java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
    at oracle.net.ns.DataPacket.send(DataPacket.java:199)
    at oracle.net.ns.NetOutputStream.write(NetOutputStream.java:176)
    at oracle.jdbc.driver.T4CSocketOutputStreamWrapper.flush(T4CSocketOutputStreamWrapper.java:98)
    at oracle.jdbc.driver.T4CSocketOutputStreamWrapper.flush(T4CSocketOutputStreamWrapper.java:91)
    at oracle.jdbc.driver.T4CSocketOutputStreamWrapper.write(T4CSocketOutputStreamWrapper.java:59)
    at oracle.jdbc.driver.T4CMAREngine.value2Buffer(T4CMAREngine.java:974)
    at oracle.jdbc.driver.T4CMAREngine.marshalSB4(T4CMAREngine.java:424)
    at oracle.jdbc.driver.T4CMAREngine.marshalUB4(T4CMAREngine.java:448)
    at oracle.jdbc.driver.T4C8Oall.marshalPisdef(T4C8Oall.java:1179)
    at oracle.jdbc.driver.T4C8Oall.marshal(T4C8Oall.java:958)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:189)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:523)
    at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:193)
    at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:852)
    ... 101 more