tomcat中发布WebReport,访问数据决策系统中的报表,对于参数的数据源来源于数据库查询的控件,点击控件会报错,确定driver,url,username,password,都正确,达梦6数据库,但是从报表设计器中预览该控件就没问题,请教各位大佬,这个网络通信异常有哪些可能存在的问题?十月 21, 2020 10:38:18 上午 警告: Query:select id,name from basevoltage where id in (select bv_id from substation ) order by nameCannot create PoolableConnectionFactory (网络通信异常)com.fr.data.TableDataException: Query:select id,name from basevoltage where id in (select bv_id from substation ) order by nameCannot create PoolableConnectionFactory (网络通信异常) at com.fr.web.dav.LocalEnv.previewTableData(LocalEnv.java:340) at com.fr.web.dav.LocalEnv.previewTableData(LocalEnv.java:353) at com.fr.data.impl.FormulaDisplayDictionary.createKVS(FormulaDisplayDictionary.java:140) at com.fr.data.impl.FormulaDisplayDictionary.entrys(FormulaDisplayDictionary.java:109) at com.fr.report.web.ui.TreeEditor.produceAjaxTreeNode(TreeEditor.java:263) at com.fr.report.web.ui.TreeEditor.loadAjaxTreeNode(TreeEditor.java:238) at com.fr.report.web.ui.TreeEditor.loadAjaxTreeData(TreeEditor.java:224) at com.fr.report.web.ui.TreeEditor.createJSONData(TreeEditor.java:154) at com.fr.web.core.service.WidgetService.process(WidgetService.java:69) at com.fr.web.core.service.NoOPService.process(NoOPService.java:10) at com.fr.web.core.ReportDispatcher.dealWithRequest(ReportDispatcher.java:159) at com.fr.web.ReportServlet.doGet(ReportServlet.java:150) at com.fr.web.ReportServlet.doPost(ReportServlet.java:203)