休眠错误随机出现答案

【问题标题】：Hibernate error appearing randomly休眠错误随机出现
【发布时间】：2013-08-16 02:57:28
【问题描述】：

我遇到了 4 个不同的错误，这些错误是在通过休眠访问数据库时随机出现的。它们并不总是出现，特别是在调试模式下。请告诉我尝试修复它们的各种方法。错误如下。

询问我是否需要更多信息。

错误 1：

org.springframework.web.util.NestedServletException: Request processing failed; 
nested exception is org.hibernate.exception.GenericJDBCException: could not execute query
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

org.hibernate.exception.GenericJDBCException: could not execute query

org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
org.hibernate.loader.Loader.doList(Loader.java:2231)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:85)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.sql.SQLException: You can't operate on a closed Statement!!!
com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:85)
org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
org.hibernate.loader.Loader.getResultSet(Loader.java:1808)
org.hibernate.loader.Loader.doQuery(Loader.java:697)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
org.hibernate.loader.Loader.doList(Loader.java:2228)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:85)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.lang.NullPointerException
com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:78)
org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
org.hibernate.loader.Loader.getResultSet(Loader.java:1808)
org.hibernate.loader.Loader.doQuery(Loader.java:697)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
org.hibernate.loader.Loader.doList(Loader.java:2228)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:85)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

错误2：

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

root cause

java.lang.NullPointerException
com.mysql.jdbc.ResultSetImpl.getStringInternal(ResultSetImpl.java:5727)
com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5577)
com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5617)
com.mchange.v2.c3p0.impl.NewProxyResultSet.getString(NewProxyResultSet.java:3342)
org.hibernate.type.StringType.get(StringType.java:41)
org.hibernate.type.NullableType.nullSafeGet(NullableType.java:184)
org.hibernate.type.NullableType.nullSafeGet(NullableType.java:173)
org.hibernate.type.AbstractType.hydrate(AbstractType.java:105)
org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2124)
org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1404)
org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1332)
org.hibernate.loader.Loader.getRow(Loader.java:1230)
org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:603)
org.hibernate.loader.Loader.doQuery(Loader.java:724)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
org.hibernate.loader.Loader.doList(Loader.java:2228)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:83)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

错误 3：

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.exception.GenericJDBCException: could not execute query
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

org.hibernate.exception.GenericJDBCException: could not execute query
org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
org.hibernate.loader.Loader.doList(Loader.java:2231)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:81)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.sql.SQLException: Operation not allowed after ResultSet closed
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1075)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:929)
com.mysql.jdbc.ResultSetImpl.checkClosed(ResultSetImpl.java:795)
com.mysql.jdbc.ResultSetImpl.findColumn(ResultSetImpl.java:1106)
com.mysql.jdbc.ResultSetImpl.getLong(ResultSetImpl.java:3022)
com.mchange.v2.c3p0.impl.NewProxyResultSet.getLong(NewProxyResultSet.java:2625)
org.hibernate.type.LongType.get(LongType.java:51)
org.hibernate.type.NullableType.nullSafeGet(NullableType.java:184)
org.hibernate.type.NullableType.nullSafeGet(NullableType.java:173)
org.hibernate.loader.Loader.getKeyFromResultSet(Loader.java:1121)
org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:588)
org.hibernate.loader.Loader.doQuery(Loader.java:724)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
org.hibernate.loader.Loader.doList(Loader.java:2228)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:81)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

错误 4：

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.exception.GenericJDBCException: could not execute query
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

org.hibernate.exception.GenericJDBCException: could not execute query
org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
org.hibernate.loader.Loader.doList(Loader.java:2231)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:81)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.sql.SQLException: You can't operate on a closed Connection!!!com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
com.mchange.v2.c3p0.impl.NewProxyConnection.prepareStatement(NewProxyConnection.java:222)
org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:534)
org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:452)
org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)
org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1573)
org.hibernate.loader.Loader.doQuery(Loader.java:696)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
org.hibernate.loader.Loader.doList(Loader.java:2228)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:81)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.lang.NullPointerExceptioncom.mchange.v2.c3p0.impl.NewProxyConnection.prepareStatement(NewProxyConnection.java:186)
org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:534)
org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:452)
org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)
org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1573)
org.hibernate.loader.Loader.doQuery(Loader.java:696)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
org.hibernate.loader.Loader.doList(Loader.java:2228)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
org.hibernate.loader.Loader.list(Loader.java:2120)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:81)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

【问题讨论】：

标签： java hibernate jakarta-ee jdbc

【解决方案1】：

似乎是由 NewlyAddedDevicesDaoImpl 第 81/83/85 行中的 NullPointerException 引起的。
检查堆栈跟踪以查找对域类（非框架）的引用。

示例：

com.metropro.eps.dao.impl.NewlyAddedDevicesDaoImpl.getSeriesDevices(NewlyAddedDevicesDaoImpl.java:81)
com.metropro.eps.bo.impl.NewlyAddedDevicesBoImpl.getSeriesDevices(NewlyAddedDevicesBoImpl.java:49)
com.metropro.eps.controller.RepositoryController.getSeriesDevices(RepositoryController.java:105)

在NewlyAddedDevicesDaoImpl.getSeriesDevices() 的请求处添加日志语句以检查 DTO 中的值，以确保没有使用空值。
最好在 Controller/BoImpl 中添加日志语句，以检查 DTO 中的值如何在每一层填充/更改。

确保在NewlyAddedDevicesDaoImpl.getSeriesDevices() 中没有取消引用空值。

如果可能，邮政编码为NewlyAddedDevicesDaoImpl.getSeriesDevices()。

【讨论】：

【解决方案2】：

检查您是否在每次休眠事务后关闭会话。我遇到了类似的问题，并且“随机”出现异常 org.hibernate.exception.GenericJDBCException: could not execute query。在一个地方，我没有关闭会话，所以我达到了数据库中打开事务的限制。我刚刚添加了 sessionFactory.getCurrentSession().close();这解决了我的问题。如果您能提供一些您的 dao 实现代码，将会很有帮助！

【讨论】：

它的固定长背。是的，会议并不是每次都结束。我在 6 个月前退出了那个项目，所以我再也无法获得它的代码了。无论如何，我已经接受了你的回答并投了赞成票。如果您认为这是一个好问题，请也给这个问题投票。