Hi, Are you using Oracle’s JDK? Thanks -Vincent On 15 Apr 2015 at 11:22:12, D R (rir.ceg(a)gmail.com) wrote: Hi everybody, I recently migrated our XWiki Windows Server installation to an Ubuntu Server 14.10 (x64) setup with XWiki 7, Tomcat 8, Java 8 and Nginx proxy. All issues that occurred were fixed and everything is running smoothly now except for one thing. JPG images don't show up on XWiki, I get the error output appended below. The crucial line seems to be: "Could not initialize class com.sun.imageio.plugins.jpeg.JPEGImageReader". I searched on google and downgraded to JRE 7 but that didn't fix the issue so I re-installed JRE-8 and purged JRE-7 again. Could someone please point me in the right direction how to fix this? ---[CATALINA LOG OUTPUT]--- WARN c.x.x.w.XWikiAction - Uncaught exception: Error number 0 in 11: Uncaught exception com.xpn.xwiki.XWikiException: Error number 0 in 11: Uncaught exception at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:368) [XWikiAction.class:na] at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:146) [XWikiAction.class:na] at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425) [RequestProcessor.class:1.3.10] at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228) [RequestProcessor.class:1.3.10] at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) [ActionServlet.class:1.3.10] at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449) [ActionServlet.class:1.3.10] at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) [tomcat8-servlet-api-8.0.9.jar:na] at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [tomcat8-servlet-api-8.0.9.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:115) [ActionFilter.class:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:127) [ConversionFilter.class:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat8-websocket-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63) [SetHTTPHeaderFilter.class:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66) [XWikiDavFilter.class:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208) [SavedRequestRestorerFilter.class:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111) [SetCharacterEncodingFilter.class:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:526) [tomcat8-catalina-8.0.9.jar:8.0.9] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078) [tomcat8-coyote-8.0.9.jar:8.0.9] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:655) [tomcat8-coyote-8.0.9.jar:8.0.9] at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) [tomcat8-coyote-8.0.9.jar:8.0.9] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566) [tomcat8-coyote-8.0.9.jar:8.0.9] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523) [tomcat8-coyote-8.0.9.jar:8.0.9] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40-internal] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40-internal] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat8-util-8.0.9.jar:8.0.9] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40-internal] Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.sun.imageio.plugins.jpeg.JPEGImageReader at com.sun.imageio.plugins.jpeg.JPEGImageReaderSpi.createReaderInstance(JPEGImageReaderSpi.java:85) ~[na:1.8.0_40-internal] at javax.imageio.spi.ImageReaderSpi.createReaderInstance(ImageReaderSpi.java:320) ~[na:1.8.0_40-internal] at javax.imageio.ImageIO$ImageReaderIterator.next(ImageIO.java:529) ~[na:1.8.0_40-internal] at javax.imageio.ImageIO$ImageReaderIterator.next(ImageIO.java:513) ~[na:1.8.0_40-internal] at javax.imageio.ImageIO.read(ImageIO.java:1443) ~[na:1.8.0_40-internal] at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_40-internal] at com.xpn.xwiki.internal.plugin.image.DefaultImageProcessor.readImage(DefaultImageProcessor.java:58) ~[DefaultImageProcessor.class:na] at com.xpn.xwiki.plugin.image.ImagePlugin.shrinkImage(ImagePlugin.java:311) ~[ImagePlugin.class:na] at com.xpn.xwiki.plugin.image.ImagePlugin.downloadImageFromCache(ImagePlugin.java:285) ~[ImagePlugin.class:na] at com.xpn.xwiki.plugin.image.ImagePlugin.downloadImage(ImagePlugin.java:248) ~[ImagePlugin.class:na] at com.xpn.xwiki.plugin.image.ImagePlugin.downloadAttachment(ImagePlugin.java:221) ~[ImagePlugin.class:na] at com.xpn.xwiki.plugin.XWikiPluginManager.downloadAttachment(XWikiPluginManager.java:287) ~[XWikiPluginManager.class:na] at com.xpn.xwiki.web.DownloadAction.render(DownloadAction.java:111) ~[DownloadAction.class:na] at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:345) [XWikiAction.class:na] ... 47 common frames omitted Thanks in advance, Dennis _______________________________________________ users mailing list users(a)xwiki.org http://lists.xwiki.org/mailman/listinfo/users