java.lang.NullPointerException

java.lang.NullPointerException: null
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由 Filter8_ExceptionHandlerFilter 所捕捉
java.lang.NullPointerException: null
tw.jiangsir.Utils.DAO.SuperDAO.executeQuery(SuperDAO.java:220)
tw.jiangsir.Utils.DAO.SuperDAO.executeQuery(SuperDAO.java:288)
tw.zerojudge.DAOs.ProblemDAO.getProblemsByRules(ProblemDAO.java:59)
tw.zerojudge.DAOs.ProblemService.getOpenProblemsByRules(ProblemService.java:971)
tw.zerojudge.Servlets.ProblemsServlet.service(ProblemsServlet.java:82)
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.Filter8_ExceptionHandlerFilter.doFilter(Filter8_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.Filter7_PerformanceFilter.doFilter(Filter7_PerformanceFilter.java:55)
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:115)
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:330)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
tw.jiangsir.Utils.Filters.Filter4_CSRFFilter.doFilter(Filter4_CSRFFilter.java:118)
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:104)
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:46)
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:84)
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:67)
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.http11.Http11Processor.service(Http11Processor.java:375)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
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)