[xwiki-users] XAR Export fails - Invalid white space character (0x1) in text to output

I can no longer make a XAR export of our wiki. The essential error message in catalina.out seems to be "Invalid white space character (0x1) in text to output (in xml 1.1, could output as a character entity)" Alas, there is no information about which wiki page contains this invalid character. I can, of course, export parts of the wiki and repeat the process until I find the offending page, but I suspect there has got to be a more efficient way. The full, relevant section of catalina.out on our test server is included below. Thanks in advance for any tips! Cheers, Peter John Acklam 2016-02-19 09:36:17,163 [ http://wiki-test/xwiki/bin/export/XWiki/XWikiPreferences?editor=globaladmin…] WARN c.x.x.w.XWikiAction - Uncaught exception: Error number 11015 in 11: Exception while exporting com.xpn.xwiki.XWikiException: Error number 11015 in 11: Exception while exporting at com.xpn.xwiki.web.ExportAction.render(ExportAction.java:84) ~[xwiki-platform-legacy-oldcore-7.4.1.jar:na] at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:417) [xwiki-platform-legacy-oldcore-7.4.1.jar:na] at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:184) [xwiki-platform-legacy-oldcore-7.4.1.jar:na] at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425) [struts-core-1.3.10.jar:1.3.10] at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228) [struts-core-1.3.10.jar:1.3.10] at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) [struts-core-1.3.10.jar:1.3.10] at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) [struts-core-1.3.10.jar:1.3.10] at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) [servlet-api.jar:na] at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:115) [xwiki-platform-legacy-oldcore-7.4.1.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:127) [xwiki-platform-wysiwyg-server-7.4.1.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63) [xwiki-platform-container-servlet-7.4.1.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66) [xwiki-platform-webdav-server-7.4.1.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208) [xwiki-platform-container-servlet-7.4.1.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111) [xwiki-platform-container-servlet-7.4.1.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:137) [xwiki-platform-resource-servlet-7.4.1.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.30] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) [catalina.jar:8.0.30] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.30] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.30] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521) [catalina.jar:8.0.30] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096) [tomcat-coyote.jar:8.0.30] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674) [tomcat-coyote.jar:8.0.30] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) [tomcat-coyote.jar:8.0.30] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) [tomcat-coyote.jar:8.0.30] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_66] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_66] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.30] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66] Caused by: org.xwiki.filter.FilterException: Failed to write element at org.xwiki.filter.xml.internal.output.FilterStreamXMLStreamWriter.writeCharacters(FilterStreamXMLStreamWriter.java:158) ~[xwiki-commons-filter-xml-7.4.1.jar:na] at org.xwiki.filter.xml.internal.output.FilterStreamXMLStreamWriter.writeElement(FilterStreamXMLStreamWriter.java:145) ~[xwiki-commons-filter-xml-7.4.1.jar:na] at org.xwiki.filter.xar.internal.output.XAROutputFilterStream.beginWikiDocumentRevision(XAROutputFilterStream.java:349) ~[xwiki-platform-filter-stream-xar-7.4.1.jar:na] at sun.reflect.GeneratedMethodAccessor601.invoke(Unknown Source) ~[na:na] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_66] at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_66] at org.xwiki.filter.internal.FilterProxy.invoke(FilterProxy.java:90) ~[xwiki-commons-filter-api-7.4.1.jar:na] at org.xwiki.filter.internal.FilterProxy.invoke(FilterProxy.java:63) ~[xwiki-commons-filter-api-7.4.1.jar:na] at com.sun.proxy.$Proxy88.beginWikiDocumentRevision(Unknown Source) ~[na:na] at org.xwiki.filter.instance.internal.input.XWikiDocumentLocaleEventGenerator.writeRevision(XWikiDocumentLocaleEventGenerator.java:167) ~[xwiki-platform-filter-instance-oldcore-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.XWikiDocumentLocaleEventGenerator.write(XWikiDocumentLocaleEventGenerator.java:116) ~[xwiki-platform-filter-instance-oldcore-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.XWikiDocumentLocaleEventGenerator.write(XWikiDocumentLocaleEventGenerator.java:55) ~[xwiki-platform-filter-instance-oldcore-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.AbstractBeanEntityEventGenerator.write(AbstractBeanEntityEventGenerator.java:114) ~[xwiki-platform-filter-instance-api-7.4.1.jar:na] at org.xwiki.filter.instance.input.AbstractEntityEventGenerator.write(AbstractEntityEventGenerator.java:77) ~[xwiki-platform-filter-instance-api-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.DocumentInstanceInputEventGenerator.beginWikiDocument(DocumentInstanceInputEventGenerator.java:107) ~[xwiki-platform-filter-instance-oldcore-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.InstanceInputFilterStream.writeDocument(InstanceInputFilterStream.java:229) ~[xwiki-platform-filter-instance-api-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.InstanceInputFilterStream.writeSpace(InstanceInputFilterStream.java:195) ~[xwiki-platform-filter-instance-api-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.InstanceInputFilterStream.writeWiki(InstanceInputFilterStream.java:161) ~[xwiki-platform-filter-instance-api-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.InstanceInputFilterStream.read(InstanceInputFilterStream.java:130) ~[xwiki-platform-filter-instance-api-7.4.1.jar:na] at org.xwiki.filter.instance.internal.input.InstanceInputFilterStream.read(InstanceInputFilterStream.java:54) ~[xwiki-platform-filter-instance-api-7.4.1.jar:na] at org.xwiki.filter.input.AbstractBeanInputFilterStream.read(AbstractBeanInputFilterStream.java:80) ~[xwiki-commons-filter-api-7.4.1.jar:na] at com.xpn.xwiki.web.ExportAction.exportXAR(ExportAction.java:337) ~[xwiki-platform-legacy-oldcore-7.4.1.jar:na] at com.xpn.xwiki.web.ExportAction.render(ExportAction.java:77) ~[xwiki-platform-legacy-oldcore-7.4.1.jar:na] ... 50 common frames omitted Caused by: com.ctc.wstx.exc.WstxIOException: Invalid white space character (0x1) in text to output (in xml 1.1, could output as a character entity) at com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:458) ~[woodstox-core-asl-4.4.1.jar:4.4.1] at javanet.staxutils.IndentingXMLStreamWriter.writeCharacters(IndentingXMLStreamWriter.java:209) ~[stax-utils-20070216.jar:na] at org.xwiki.filter.xml.internal.output.FilterStreamXMLStreamWriter.writeCharacters(FilterStreamXMLStreamWriter.java:156) ~[xwiki-commons-filter-xml-7.4.1.jar:na] ... 72 common frames omitted Caused by: java.io.IOException: Invalid white space character (0x1) in text to output (in xml 1.1, could output as a character entity) at com.ctc.wstx.api.InvalidCharHandler$FailingHandler.convertInvalidChar(InvalidCharHandler.java:55) ~[woodstox-core-asl-4.4.1.jar:4.4.1] at com.ctc.wstx.sw.XmlWriter.handleInvalidChar(XmlWriter.java:629) ~[woodstox-core-asl-4.4.1.jar:4.4.1] at com.ctc.wstx.sw.BufferingXmlWriter.writeCharacters(BufferingXmlWriter.java:586) ~[woodstox-core-asl-4.4.1.jar:4.4.1] at com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:456) ~[woodstox-core-asl-4.4.1.jar:4.4.1] ... 74 common frames omitted