使用hibernate将数据导出到数据库时无法打开连接

我已经编写了一个将jcr数据导出到数据库的服务。当我启动应用程序的服务器时，服务会自动启动。以前，它导出数据时没有任何问题，因为两天以来，每当我启动服务器时，它都会成功导出数据，但再次出现以下异常：我试图找到问题，但未能成功

23:31:55562错误[STDERR]org.springframework.dao.InvalidDataAccessResourceUsageException:无法打开连接；嵌套异常为org.hibernate.exception.sqlgrammareexception:无法打开连接 23:31:55562 org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException（SessionFactoryUtils.java:615）处的错误[STDERR] 23:31:55562 org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException（HibernateAccessor.java:412）处的错误[STDERR] 23:31:55562 org.springframework.orm.hibernate3.HibernateTemplate.doExecute（HibernateTemplate.java:424）处的错误[STDERR] 23:31:55562 org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession（HibernateTemplate.java:374）处的错误[STDERR] 23:31:55562 org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate（HibernateTemplate.java:744）处的错误[STDERR] 23:31:55562 nl.gx.snsbank.jcrreport.dao.PageDAOImp.store（PageDAOImp.java:39）处的错误[STDERR] 23:31:55562 nl.gx.snsbank.jcrobjectsbuilder.PageBuilder.createDomainObject（PageBuilder.java:88）处的错误[STDERR] 23:31:55562 nl.gx.snsbank.jcrobjectsbuilder.PageBuilder.SaveToDB（PageBuilder.java:57）处的错误[STDERR] 23:31:55562 nl.gx.snsbank.service.JCRExporterService.exportToDB（JCRExporterService.java:91）处的错误[STDERR] 23:31:55562 nl.gx.snsbank.service.SchedulerJobServiceImpl.run（SchedulerJobServiceImpl.java:114）处的错误[STDERR] 23:31:55562 nl.gx.snsbank.service.SchedulerJobServiceImpl.scheduleJob（SchedulerJobServiceImpl.java:153）处的错误[STDERR] 23:31:55562 nl.gx.snsbank.service.SchedulerJobServiceImpl.onStart（SchedulerJobServiceImpl.java:78）处的错误[STDERR] 23:31:55562 sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处出现错误[STDERR] 23:31:55562 sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）处出现错误[STDERR] 23:31:55562 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）处出现错误[STDERR] 23:31:55562 java.lang.reflect.Method.invoke（Method.java:597）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.serviceinpl.invoke（serviceinpl.java:484）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.ServiceImpl.activateService（ServiceImpl.java:441）上的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.serviceinpl.access$000处的错误[STDERR]（serviceinpl.java:44） 23:31:55562 org.apache.felix.dependencymanager.ServiceImpl$1.run（ServiceImpl.java:113）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor$1.run（SerialExecutor.java:47）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor.scheduleNext（SerialExecutor.java:84）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor.access$000处的错误[STDERR]（SerialExecutor.java:33） 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor$1.run（SerialExecutor.java:50）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor.scheduleNext（SerialExecutor.java:84）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor.execute（SerialExecutor.java:68）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencManager.ServiceImpl.calculateStateChanges（ServiceImpl.java:147）上的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.serviceinpl.start（serviceinpl.java:257）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.dependencymanager.add（dependencymanager.java:56）处的错误[STDERR] 3:31:5562错误[STDRR]在NL.GX.WebMealjava .WCB .Frase. 3:31:5562错误[STDRR]在NL.GX.WebMealjava .WCB .Frase. 3:31:5562错误[STDRR]在NL.GX.WebMealjava .WCB .Frase. 在NL.Gx.WebMeals.WCB .Fr.BaseTekLeIMP.List.（CeultBeuleIMP.java：160）中，错误[STDRR] 23:31:55562 sun.reflect.GeneratedMethodAccessor123.invoke处出现错误[STDERR]（未知源） 23:31:55562 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）处出现错误[STDERR] 23:31:55562 java.lang.reflect.Method.invoke（Method.java:597）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.serviceinpl.invoke（serviceinpl.java:484）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.ServiceImpl.activateService（ServiceImpl.java:441）上的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.serviceinpl.access$000处的错误[STDERR]（serviceinpl.java:44） 23:31:55562 org.apache.felix.dependencymanager.ServiceImpl$1.run（ServiceImpl.java:113）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor$1.run（SerialExecutor.java:47）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor.scheduleNext（SerialExecutor.java:84）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor.access$000处的错误[STDERR]（SerialExecutor.java:33） 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor$1.run（SerialExecutor.java:50）处的错误[STDERR] 23:31:55562 org.apache.felix.dependencymanager.SerialExecutor.scheduleNext（SerialExecutor.java:84）处的错误[STDERR] 23:31:55562 org.apache.fe上的错误[STDERR]