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最近开发遇到个新问题，导出Excel数据时出现的异常，望大家帮忙看看，谢谢！

导出Excel异常 
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2013-11-5 18:56:09 org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor processChildren
严重: Exception invoking periodic operation:
java.lang.OutOfMemoryError: Java heap space
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:114)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren

(ContainerBase.java:1601)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run

(ContainerBase.java:1590)
at java.lang.Thread.run(Thread.java:662)
2013-11-05 18:56:21,418   ERROR   [org.hibernate.transaction.JDBCTransaction.toggleAutoCommit

(JDBCTransaction.java:198)]   -   Could not toggle autocommit
java.sql.SQLException: Connection is closed!
at com.jolbox.bonecp.ConnectionHandle.checkClosed(ConnectionHandle.java:342)
at com.jolbox.bonecp.ConnectionHandle.setAutoCommit(ConnectionHandle.java:971)
at org.hibernate.transaction.JDBCTransaction.toggleAutoCommit(JDBCTransaction.java:194)
at org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit

(JDBCTransaction.java:186)
at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:162)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback

(HibernateTransactionManager.java:674)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback

(AbstractPlatformTransactionManager.java:823)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback

(AbstractPlatformTransactionManager.java:800)
at

org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing

(TransactionAspectSupport.java:339)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke

(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke

(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept

(Cglib2AopProxy.java:635)
at com.ringtop.ccraims.rptmgr.bkoact.business.impl.BkoactServiceImpl$$EnhancerByCGLIB$

$41c08f0b.getAll(<generated>)
at com.ringtop.ccraims.rptmgr.bkoact.action.BkoactAction.exportData(BkoactAction.java:113)
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:110)
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.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.ringtop.global.filter.PageFilter.doFilter(PageFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.extremecomponents.table.filter.AbstractExportFilter.doFilter

(AbstractExportFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal

(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal

(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.ringtop.global.filter.EncodingFilter.doFilter(EncodingFilter.java:42)
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:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
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:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process

(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)
2013-11-05 18:56:21,418   ERROR   [org.hibernate.transaction.JDBCTransaction.rollback

(JDBCTransaction.java:168)]   -   JDBC rollback failed
java.sql.SQLException: Connection is closed!
at com.jolbox.bonecp.ConnectionHandle.checkClosed(ConnectionHandle.java:342)
at com.jolbox.bonecp.ConnectionHandle.rollback(ConnectionHandle.java:953)
at org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit

(JDBCTransaction.java:183)
at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:162)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback

(HibernateTransactionManager.java:674)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback

(AbstractPlatformTransactionManager.java:823)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback

(AbstractPlatformTransactionManager.java:800)
at

org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing

(TransactionAspectSupport.java:339)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke

(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke

(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept

(Cglib2AopProxy.java:635)
at com.ringtop.ccraims.rptmgr.bkoact.business.impl.BkoactServiceImpl$$EnhancerByCGLIB$

$41c08f0b.getAll(<generated>)
at com.ringtop.ccraims.rptmgr.bkoact.action.BkoactAction.exportData(BkoactAction.java:113)
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:110)
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.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.ringtop.global.filter.PageFilter.doFilter(PageFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.extremecomponents.table.filter.AbstractExportFilter.doFilter

(AbstractExportFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal

(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal

(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.ringtop.global.filter.EncodingFilter.doFilter(EncodingFilter.java:42)
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:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
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:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process

(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)
2013-11-05 18:56:24,865   ERROR  

[org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing

(TransactionAspectSupport.java:342)]   -   Application exception overridden by rollback exception
java.lang.OutOfMemoryError: Java heap space
at oracle.sql.NUMBER.toBigDecimal(NUMBER.java:685)
at oracle.jdbc.dbaccess.DBConversion.NumberBytesToBigDecimal(DBConversion.java:2805)
at oracle.jdbc.driver.OracleStatement.getBigDecimalValue(OracleStatement.java:4539)
at oracle.jdbc.driver.OracleResultSetImpl.getBigDecimal(OracleResultSetImpl.java:1223)
at oracle.jdbc.driver.OracleResultSet.getBigDecimal(OracleResultSet.java:2012)
at org.hibernate.type.BigDecimalType.get(BigDecimalType.java:23)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:113)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:140)
at org.hibernate.loader.custom.CustomLoader.getResultColumnOrRow(CustomLoader.java:183)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:595)
at org.hibernate.loader.Loader.doQuery(Loader.java:689)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2145)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
at org.hibernate.loader.Loader.list(Loader.java:2024)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:111)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1674)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:147)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:164)
at com.ringtop.ccraims.rptmgr.bkoact.dao.BkoactDao.getAll(BkoactDao.java:89)
at com.ringtop.ccraims.rptmgr.bkoact.business.impl.BkoactServiceImpl.getAll

(BkoactServiceImpl.java:51)
at com.ringtop.ccraims.rptmgr.bkoact.business.impl.BkoactServiceImpl$$FastClassByCGLIB$

$38cdff2f.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint

(Cglib2AopProxy.java:700)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke

(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke

(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept

(Cglib2AopProxy.java:635)
at com.ringtop.ccraims.rptmgr.bkoact.business.impl.BkoactServiceImpl$$EnhancerByCGLIB$

$41c08f0b.getAll(<generated>)
at com.ringtop.ccraims.rptmgr.bkoact.action.BkoactAction.exportData(BkoactAction.java:113)
2013-11-05 18:56:24,951   WARN   [org.apache.struts.action.RequestProcessor.processException

(RequestProcessor.java:528)]   -   Unhandled Exception thrown: class

org.springframework.transaction.TransactionSystemException
2013-11-5 18:56:25 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.sql.SQLException: Connection is closed!
at com.jolbox.bonecp.ConnectionHandle.checkClosed(ConnectionHandle.java:342)
at com.jolbox.bonecp.ConnectionHandle.rollback(ConnectionHandle.java:953)
at org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit

(JDBCTransaction.java:183)
at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:162)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback

(HibernateTransactionManager.java:674)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback

(AbstractPlatformTransactionManager.java:823)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback

(AbstractPlatformTransactionManager.java:800)
at

org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing

(TransactionAspectSupport.java:339)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke

(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke

(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed

(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept

(Cglib2AopProxy.java:635)
at com.ringtop.ccraims.rptmgr.bkoact.business.impl.BkoactServiceImpl$$EnhancerByCGLIB$

$41c08f0b.getAll(<generated>)
at com.ringtop.ccraims.rptmgr.bkoact.action.BkoactAction.exportData(BkoactAction.java:113)
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:110)
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.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.ringtop.global.filter.PageFilter.doFilter(PageFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.extremecomponents.table.filter.AbstractExportFilter.doFilter

(AbstractExportFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal

(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal

(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.ringtop.global.filter.EncodingFilter.doFilter(EncodingFilter.java:42)
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:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
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:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process

(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)
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