Exporting Jasper report to Text File

Hello Every one,

                               I want  to export Jasper report to Text file instead of PDF file, for this I am using JRTextExporter API. for reports having no textfields its work fine, but I have a report that have multiple textfields when I tried to convert that Report thet give me ArrayOutOfBound Exception. any please help me.

in the attachment I have uploaded Jrxml file of my report

the stack trace is given:

java.lang.ArrayIndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException
    at java.lang.System.arraycopy(Native Method)
    at net.sf.jasperreports.engine.export.JRTextExporter.exportText(JRTextExporter.java:615)
    at net.sf.jasperreports.engine.export.JRTextExporter.exportElements(JRTextExporter.java:393)
    at net.sf.jasperreports.engine.export.JRTextExporter.exportPage(JRTextExporter.java:370)
    at net.sf.jasperreports.engine.export.JRTextExporter.exportReportToWriter(JRTextExporter.java:346)
    at net.sf.jasperreports.engine.export.JRTextExporter.exportReport(JRTextExporter.java:222)
    at com.example.reporttextexporter.ReporttextexporterApplication.make(ReporttextexporterApplication.java:156)
    at com.example.reporttextexporter.ReporttextexporterApplication.access$0(ReporttextexporterApplication.java:128)
    at com.example.reporttextexporter.ReporttextexporterApplication$1.buttonClick(ReporttextexporterApplication.java:49)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:512)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:164)
    at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1219)
    at com.vaadin.ui.Button.fireClick(Button.java:550)
    at com.vaadin.ui.Button.changeVariables(Button.java:217)
    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.changeVariables(AbstractCommunicationManager.java:1451)
    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariableBurst(AbstractCommunicationManager.java:1399)
    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1318)
    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:763)
    at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:296)
    at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:501)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)