Not able to obtain connection

当我插入完一条数据后,
再返回到记录列表的时候就出现先面的异常!
当我单独显示列表时,没有异常发现.
有人知道是什么原因吗?

select {fgdw.*} from Jc_Fgdw fgdw where id=1282561900
Hibernate: select fgdw.ID as ID0_, fgdw.FGDWDM as FGDWDM0_0_, fgdw.DWDM as DWDM0_0_, fgdw.DWMC as DWMC0_0_, fgdw.BDDH as BDDH0_0_, fgdw.DWXZ as DWXZ0_0_, fgdw.LXR as LXR0_0_, fgdw.LXDH as LXDH0_0_, fgdw.FB_ID as FB9_0_0_, fgdw.DQ_ID as DQ10_0_0_ from Jc_Fgdw fgdw where id=1282561900

Hibernate: select hibernate_sequence.nextval from dual
Hibernate: insert into jc_fgdwimag (mc, path, type, fgdw_id, id) values (?, ?, ?, ?, ?)
here
select {fgdwimag.*} from jc_fgdwimag fgdwimag where fgdw_id=1282561900

org.hibernate.HibernateException: Not able to obtain connection
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:113)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:88)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1162)
at org.hibernate.loader.Loader.doQuery(Loader.java:390)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:218)
at org.hibernate.loader.Loader.doList(Loader.java:1593)
at org.hibernate.loader.Loader.list(Loader.java:1577)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:112)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1414)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:153)
at com.fgj.dao.AbsConnectDAO.findDataByWhere(AbsConnectDAO.java:81)
at com.fgj.dao.hibernate.FgdwimageHibernateDAO.findFgdwimagVO(FgdwimageHibernateDAO.java:15)
at com.fgj.business.service.UploadboImp.findDataByFgdw(UploadboImp.java:41)
at com.fgj.web.action.FgdwimagAction.getList(FgdwimagAction.java:87)
at com.fgj.web.action.FgdwimagAction.uploadFile(FgdwimagAction.java:123)
at com.fgj.web.action.FgdwimagAction.execute(FgdwimagAction.java:64)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.fgj.sys.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:41)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)

数据库配置好了没有