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Error when exporting to Excel and including a formula

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We are using IE9 with this version of SmartGWT :

SmartClient Version: v10.0p_2015-02-09/EVAL Deployment (expires 2015.04.10_06.49.00)

The error does not occur if we remove the user defined formula from the list grid, if included we get the error.

This is the code that was being executed:

Code:

        DSRequest dsRequestProperties = new DSRequest();
        dsRequestProperties.setExportAs(ExportFormat.OOXML);
        String fileName = "Data_" + selectedData + ".xlsx";
        dsRequestProperties.setExportFilename(fileName);
        dsRequestProperties.setExportDisplay(ExportDisplay.DOWNLOAD);

        grid.exportClientData(dsRequestProperties, new RPCCallback()
        {
                @Override
                public void execute(RPCResponse response, Object rawData, RPCRequest request)
                {
                }
        });

This is the error we receive:

Code:

java.lang.IllegalArgumentException: Unexpected type of cell: class org.apache.poi.xssf.streaming.SXSSFCell. Only XSSFCells can be evaluated.
        at org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator.evaluateFormulaCellValue(XSSFFormulaEvaluator.java:260)
        at org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator.evaluateFormulaCell(XSSFFormulaEvaluator.java:151)
        at com.isomorphic.rpc.ExcelDataExport.getExportObject(ExcelDataExport.java:642)
        at com.isomorphic.rpc.DataExport.exportResultSet(DataExport.java:633)
        at com.isomorphic.rpc.DataExport.exportResultSet(DataExport.java:460)
        at com.isomorphic.rpc.BuiltinRPC.downloadClientExport(BuiltinRPC.java:850)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at com.isomorphic.base.Reflection.adaptArgsAndInvoke(Reflection.java:975)
        at com.isomorphic.base.Reflection.adaptArgsAndInvoke(Reflection.java:805)
        at com.isomorphic.rpc.RPCDMI.execute(RPCDMI.java:309)
        at com.isomorphic.rpc.RPCDMI.execute(RPCDMI.java:66)
        at com.isomorphic.rpc.RPCRequest.execute(RPCRequest.java:231)
        at com.pci.portal.server.DataSourceResolver.handleRPCRequest(DataSourceResolver.java:90)
        at com.isomorphic.servlet.IDACall.processRPCTransaction(IDACall.java:175)
        at com.isomorphic.servlet.IDACall.processRequest(IDACall.java:142)
        at com.isomorphic.servlet.IDACall.doPost(IDACall.java:76)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:751)
        at com.isomorphic.servlet.BaseServlet.service(BaseServlet.java:156)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:242)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:216)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:132)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:338)
        at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:74)
        at com.isomorphic.servlet.CompressionFilter._doFilter(CompressionFilter.java:260)
        at com.isomorphic.servlet.BaseFilter.doFilter(BaseFilter.java:83)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:74)
        at com.pci.gtdw.web.filter.ResponseTimeFilter.doFilter(ResponseTimeFilter.java:95)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:74)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3296)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3262)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
        at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
        at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2171)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2097)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2075)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1513)
        at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:254)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)


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