在创建曝光时，我收到以下错误。日志只显示 DBNullConstraintException，所以我找不到导致问题的实体或列。我不确定我该如何分析这个问题？
日志详细信息：
错误在上下文 ID 'NewExposure' com.guidewire.pl.system.exception.DBNullConstraintException 中向用户显示不是 UserDisplayableException 的异常消息：在 com.guidewire.pl.system.database.entitywriter.DatabaseEntityWriterImpl.checkForNullConstraintViolation(DatabaseEntityWriterImpl. java:227) ~[pl-10.101.0.jar:?] at com.guidewire.pl.system.database.entitywriter.DatabaseEntityWriterImpl.insert(DatabaseEntityWriterImpl.java:61) ~[pl-10.101.0.jar:? ] 在 com.guidewire.pl.system.database.DatabaseChangedBeanWriter.writeBeanInserts(DatabaseChangedBeanWriter.java:296) ~[pl-10.101.0.jar:?] 在 com.guidewire.pl.system.database.DatabaseChangedBeanWriter.writeBeanChanges(DatabaseChangedBeanWriter .java:234) ~[pl-10.101.0.jar:?] at com.guidewire.pl.system.database.DatabaseChangedBeanWriter。writeChangedBeans(DatabaseChangedBeanWriter.java:81) ~[pl-10.101.0.jar:?] at com.guidewire.pl.system.bundle.BundleWriter.commitBundle(BundleWriter.java:146) ~[pl-10.101.0.jar :?] at com.guidewire.pl.system.transaction.SessionImpl.flush(SessionImpl.java:111) ~[pl-10.101.0.jar:?] at com.guidewire.pl.system.transaction.SessionImpl.commit (SessionImpl.java:169) ~[pl-10.101.0.jar:?] at com.guidewire.pl.system.transaction.TransactionManagerImpl.execute(TransactionManagerImpl.java:94) ~[pl-10.101.0.jar: ?] at com.guidewire.pl.system.transaction.TransactionManagerImpl.commitBundle(TransactionManagerImpl.java:48) ~[pl-10.101.0.jar:?] at com.guidewire.pl.system.bundle.EntityBundleImpl.commitAndGetBeans( EntityBundleImpl.java:1708) ~[pl-10.101.0.jar:?] at com.guidewire.pl.system.bundle.EntityBundleImpl.commit(EntityBundleImpl.java:1647) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.navigation.EditControllerImpl.commitChanges(EditControllerImpl.java:64) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.navigation.Location.innerCommitChanges( Location.java:524) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.navigation.Location.commitChanges(Location.java:454) ~[pl-10.101.0.jar:? ] at com.guidewire.pl.web.panel.toolbar.EditButtonsWidgetConfig$UpdateListener.onAction(EditButtonsWidgetConfig.java:89) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.action.AbstractActionListener .action(AbstractActionListener.java:32) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.action.ActionWidget.widgetEvent_internal(ActionWidget.java:114) ~[pl-10.101.0. jar:?] 在 com.guidewire.pl.web.widget.Widget.widgetEvent(Widget.java:128) ~[pl-10.101.0.jar:?] 在 com.guidewire.pl.web.controller.lifecycle。执行事件步骤。执行（ExecuteEventsStep.java:44）~[pl-10.101.0.jar:?] at com.guidewire.pl.web.controller.lifecycle.LifecycleRequestHandler.runLifecycleSteps（LifecycleRequestHandler.java:246）~[pl-10.101.0 .jar:?] at com.guidewire.pl.web.controller.lifecycle.LifecycleRequestHandler.handleRequest(LifecycleRequestHandler.java:208) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.controller .WebControllerImpl$2.run(WebControllerImpl.java:226) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.internaltools.profiler.WebProfiler.profilingBlock(WebProfiler.java:211) ~[pl -10.101.0.jar:?] at com.guidewire.pl.web.controller.WebControllerImpl.processWithProfilingHouseKeeping(WebControllerImpl.java:221) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web .controller.WebControllerImpl.handleRequest(WebControllerImpl.java:195) ~[pl-10.101.0.jar:?] 在 com.guidewire.pl.web.controller.WebServlet。handleRequest(WebServlet.java:146) ~[pl-10.101.0.jar:?] at com.guidewire.pl.web.controller.WebServlet.doPost(WebServlet.java:86) ~[pl-10.101.0.jar :?] 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:707) ~[javax.servlet-api-3.1.0.jar:3.1.0] 在 javax.servlet.http.HttpServlet.service(HttpServlet .java:790) ~[javax.servlet-api-3.1.0.jar:3.1.0] at org.eclipse.jetty.servlet.ServletHolder$NotAsyncServlet.service(ServletHolder.java:1411) ~[jetty-servlet- 9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:763) ~[jetty-servlet-9.4.30.v20200611.jar:9.4.30 .v20200611] 在 org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1631) ~[jetty-servlet-9.4.30.v20200611.jar:9.4.30.v20200611] 在 com.guidewire.pl .web.controller.csrf.CSRFTokenFilter.doFilter(CSRFTokenFilter.java:44) ~[pl-10.101.0.jar:?] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610) ~[jetty-servlet-9.4.30.v20200611.jar:9.4 .30.v20200611] 在 org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:226) ~[websocket-server-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse .jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1618) ~[jetty-servlet-9.4.30.v20200611.jar:9.4.30.v20200611] at org.eclipse.jetty.servlet.ServletHandler.doHandle( ServletHandler.java:549) ~[jetty-servlet-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) ~[jetty -server-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:602) ~[jetty-security-9.4.30.v20200611。jar:9.4.30.v20200611] 在 org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] 在org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] at org.eclipse.jetty.server.session .SessionHandler.doHandle(SessionHandler.java:1610) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java: 233) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1369) ~[jetty-server-9.4 .30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) ~[jetty-server-9.4.30.v20200611.jar:9.4. 30.v20200611] 在 org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:489) ~[jetty-servlet-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.server。 session.SessionHandler.doScope(SessionHandler.java:1580) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java :186) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1284) ~[jetty-server- 9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) ~[jetty-server-9.4.30.v20200611.jar:9.4 .30.v20200611] 在 org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse .jetty.server。Server.handle(Server.java:501) ~[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java: 383）〜[jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611]在org.eclipse.jetty.server.HttpChannel.dispatch（HttpChannel.java:556）[jetty-server-9.4.30。 v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) [jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org .eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:272) [jetty-server-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded (AbstractConnection.java:311) [jetty-io-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) [jetty-io- 9.4.30.v20200611.jar:9.4.30。v20200611] 在 org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) [jetty-io-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.util。 thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) [jetty-util-9.4.30.v20200611.jar:9.4.30.v20200611] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce( EatWhatYouKill.java:313) [jetty-util-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) [jetty -util-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) [jetty-util-9.4.30.v20200611 .jar:9.4.30.v20200611] 在 org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375) [jetty-util-9.4.30.v20200611.jar:9.4.30。v20200611] 在 org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) [jetty-util-9.4.30.v20200611.jar:9.4.30.v20200611] 在 org.eclipse.jetty.util .thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) [jetty-util-9.4.30.v20200611.jar:9.4.30.v20200611] 在 java.lang.Thread.run(Thread.java:834) [ ?:?]