Issue
The program runs for a period of time and always reports an error, restarting and returning to normal, the error is as follows：
javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not prepare statementat org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1626)at org.hibernate.query.Query.getResultList(Query.java:165)at net.skycloud.platform.user.repository.KeycloakGroupDao.findAll(KeycloakGroupDao.java:111)at net.skycloud.platform.user.service.UserGroupService.getAllUserGroups(UserGroupService.java:247)at net.skycloud.platform.user.api.rest.UserController.searchUserAndGroup(UserController.java:362)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:566)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)at javax.servlet.http.HttpServlet.service(HttpServlet.java:645)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:769)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1732)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.base/java.lang.Thread.run(Thread.java:829)Caused by: org.hibernate.exception.GenericJDBCException: could not prepare statementat org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:186)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:151)at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:2122)at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2059)at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2037)at org.hibernate.loader.Loader.doQuery(Loader.java:956)at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:357)at org.hibernate.loader.Loader.doList(Loader.java:2868)at org.hibernate.loader.Loader.doList(Loader.java:2850)at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2682)at org.hibernate.loader.Loader.list(Loader.java:2677)at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:338)at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:2181)at org.hibernate.internal.AbstractSharedSessionContract.list(AbstractSharedSessionContract.java:1204)at org.hibernate.query.internal.NativeQueryImpl.doList(NativeQueryImpl.java:177)at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1617)... 52 common frames omittedCaused by: java.sql.SQLException: Connection is closedat com.zaxxer.hikari.pool.ProxyConnection$ClosedConnection.lambda$getClosedConnection$0(ProxyConnection.java:515)at com.sun.proxy.$Proxy156.prepareStatement(Unknown Source)at com.zaxxer.hikari.pool.ProxyConnection.prepareStatement(ProxyConnection.java:337)at com.zaxxer.hikari.pool.HikariProxyConnection.prepareStatement(HikariProxyConnection.java)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:149)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:176)... 67 common frames omitted
I hope to fix this bug
Solution
Its a database operations level exception using EntityManager or any other session manager (which is not your case) as exception suggest, how ever it can have many reasons such database has closed the connection or network terminated the connection socket, and to solve it you can configure to keep the connection alive but remember you can not hold the hibernate session alive for long time by default .
Also you may have look on OSIV anti pattern.
Answered By - Lunatic
Answer Checked By - Robin (JavaFixing Admin)
