Hello,

Our team hosts a web app that displays various types of jasper reports. We recently upgraded to ZK PE 8.6.0.1. In this version, when attempting to access one of these jasper reports in the Excel format, there is an error shown in the report component window. Our workaround to this is to revert back to ZK PE 8.5.0.1, and the Excel report loads properly without any issue. I have attached images displaying the error message and the output window call stack.

Error Message:
Could not initialize class net.sf.jasperreports.engine.export.JRXlsExporter

And here is the call stack from the output window:
java.lang.NoSuchMethodError: org.apache.poi.hssf.util.HSSFColor.getTripletHash()Ljava/util/Map;
at net.sf.jasperreports.engine.export.JRXlsExporter.<clinit>(JRXlsExporter.java:160)
at org.zkoss.zkex.zul.Jasperreport$JasperreporteExporterImpl.getJRExporter(Jasperreport.java:603)
at org.zkoss.zkex.zul.Jasperreport.doReport(Jasperreport.java:512)
at org.zkoss.zkex.zul.Jasperreport.access$200(Jasperreport.java:87)
at org.zkoss.zkex.zul.Jasperreport$ExtraCtrl.getMedia(Jasperreport.java:444)
at org.zkoss.zk.au.http.AuDynaMediar.service(AuDynaMediar.java:131)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:455)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:412)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1385)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)