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java.sql.SQLException: Cannot create PoolableConnectionFactory (Communications link failure

Last packet sent to the server was 0 ms ago.)
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由 Filter7_ExceptionHandlerFilter 所捕捉
java.sql.SQLException: Cannot create PoolableConnectionFactory (Communications link failure

Last packet sent to the server was 0 ms ago.)
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:669)
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:544)
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:753)
tw.jiangsir.Utils.DAO.SuperDAO.getConnection(SuperDAO.java:55)
tw.zerojudge.DAOs.AppConfigDAO.getAppConfigByFields(AppConfigDAO.java:213)
tw.zerojudge.DAOs.AppConfigService.getAppConfig(AppConfigService.java:56)
tw.jiangsir.Utils.Scopes.ApplicationScope.getAppConfig(ApplicationScope.java:305)
tw.zerojudge.DAOs.ForumDAO.(ForumDAO.java:19)
tw.zerojudge.Servlets.Utils.ForumServlet.doGet(ForumServlet.java:29)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter7_ExceptionHandlerFilter.doFilter(Filter7_ExceptionHandlerFilter.java:63)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter6_AccessFilter.doFilter(Filter6_AccessFilter.java:57)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter5_RoleFilter.doFilter(Filter5_RoleFilter.java:76)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter4_PerformanceFilter.doFilter(Filter4_PerformanceFilter.java:106)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter3_BannedFilter.doFilter(Filter3_BannedFilter.java:71)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter2_EscapeFilter.doFilter(Filter2_EscapeFilter.java:43)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter1_EncodingFilter.doFilter(Filter1_EncodingFilter.java:85)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter0_CSPFilter.doFilter(Filter0_CSPFilter.java:66)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:688)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:351)
org.apache.coyote.http2.StreamProcessor.service(StreamProcessor.java:365)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.http2.StreamProcessor.process(StreamProcessor.java:72)
org.apache.coyote.http2.StreamRunnable.run(StreamRunnable.java:35)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:829)