Details
-
Bug
-
Resolution: Unresolved
-
Major
-
None
-
13.10.5
-
None
-
None
-
Debian Bullseye, nginx, xwiki:13.5.10-postgres-tomcat Docker
-
Unknown
-
Description
Our XWiki instance has dropouts every now and then. Sometimes it runs for two or even four weeks without problems, sometimes it gets stuck and then has to be restarted 3 times in one day. Our users are very dissatisfied.
We always use the latest XWiki LTS version as Docker, currently xwiki:13.5.10-postgres-tomcat. Until the turn of the year we had version 12.10.10, with which we had the same problems. The XWiki and Postgres container sit on a Debian Bullseye server behind an nginx, along with other Docker software that shows no problems. Server is running without problems with ocassional automatic restarts by unattended-upgrades to keep software up to date. Otherwise we have no downtime.
The Xwiki only has a few additional plugins installed. Specifically we use
- Filter Streams Converter Application
- Confluence XML module
- OpenID Connect Authenticator
- Task Manager Application
All of the plugins are kept up to date.
The XWiki has just over 200 users, but probably only about 20 people use it daily (mostly reading). The number of page edits per day is between 0 and 10. Neither the XWiki nor the server are overloaded by users. There is no evidence of hacker attacks. When the XWiki stops working it's Java will show a high CPU consumption. Here is the output of top while XWiki is stuck:
top - 14:35:53 up 49 days, 12:35, 2 users, load average: 1.30, 1.14, 1.10
Tasks: 183 total, 1 running, 182 sleeping, 0 stopped, 0 zombie
%Cpu(s): 26.0 us, 4.1 sy, 0.0 ni, 69.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 13992.9 total, 7738.0 free, 5485.8 used, 769.0 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 7920.1 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3435515 root 20 0 5489176 2.9g 38180 S 94.1 21.5 171:19.70 java
3655415 adminis+ 20 0 10432 4020 3368 R 5.9 0.0 0:00.03 top
1 root 20 0 163932 8292 5648 S 0.0 0.1 1:40.26 systemd
In normal times (when the XWiki is working) load is around 0.2 to 0.3. No screenshot from iotop, but there were no problems visible.
If the XWiki has a downtime and a user tries to access it, he will be redirected to the OAuth dialog, which he can go through (Azure AD) without any problems, but when the user is then redirected back to the XWiki, only a timeout is displayed to him by his browser.
I have been digging through the logs several times to find any clues. I have found several error messages, but they are not related in time to the failures. Here is what I've found:
We've got severeal of font/solr/tika related messages:
2021-11-29 14:08:22,714 [XWiki Solr index thread] WARN o.a.p.p.f.PDCIDFontType2 - Could not read embedded OTF for font ABCDEE+Audi Type Extended java.io.IOException: Kerning sub-table too short, got 0 bytes, expect 6 or more. at org.apache.fontbox.ttf.KerningSubtable.readSubtable0(KerningSubtable.java:191) at org.apache.fontbox.ttf.KerningSubtable.read(KerningSubtable.java:70) at org.apache.fontbox.ttf.KerningTable.read(KerningTable.java:80) at org.apache.fontbox.ttf.TrueTypeFont.readTable(TrueTypeFont.java:353) at org.apache.fontbox.ttf.TTFParser.parseTables(TTFParser.java:173) at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:150) at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:79) at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:27) at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:106) at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:73) at org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:112) at org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:65) at org.apache.pdfbox.pdmodel.font.PDFontFactory.createDescendantFont(PDFontFactory.java:139) at org.apache.pdfbox.pdmodel.font.PDType0Font.<init>(PDType0Font.java:196) at org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:97) at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:146) at org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:66) at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:933) at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:515) at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:489) at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:156) at org.apache.pdfbox.text.LegacyPDFStreamEngine.processPage(LegacyPDFStreamEngine.java:144) at org.apache.pdfbox.text.PDFTextStripper.processPage(PDFTextStripper.java:397) at org.apache.tika.parser.pdf.PDF2XHTML.processPage(PDF2XHTML.java:125) at org.apache.tika.parser.pdf.AbstractPDF2XHTML.processPages(AbstractPDF2XHTML.java:963) at org.apache.pdfbox.text.PDFTextStripper.writeText(PDFTextStripper.java:272) at org.apache.tika.parser.pdf.PDF2XHTML.process(PDF2XHTML.java:96) at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:174) at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280) at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280) at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:143) at org.apache.tika.Tika.parseToString(Tika.java:527) at org.xwiki.tika.internal.TikaUtils.parseToString(TikaUtils.java:153) at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getContentAsText(AbstractSolrMetadataExtractor.java:509) at org.xwiki.search.solr.internal.metadata.AttachmentSolrMetadataExtractor.setLocaleAndContentFields(AttachmentSolrMetadataExtractor.java:111) at org.xwiki.search.solr.internal.metadata.AttachmentSolrMetadataExtractor.setFieldsInternal(AttachmentSolrMetadataExtractor.java:93) at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getSolrDocument(AbstractSolrMetadataExtractor.java:133) at org.xwiki.search.solr.internal.DefaultSolrIndexer.getSolrDocument(DefaultSolrIndexer.java:499) at org.xwiki.search.solr.internal.DefaultSolrIndexer.processBatch(DefaultSolrIndexer.java:408) at org.xwiki.search.solr.internal.DefaultSolrIndexer.run(DefaultSolrIndexer.java:376) at java.base/java.lang.Thread.run(Thread.java:829) 2021-11-29 14:08:22,714 [XWiki Solr index thread] WARN o.a.p.p.f.PDCIDFontType2 - Using fallback font LiberationSans for CID-keyed TrueType font ABCDEE+Audi Type Extended 2021-11-29 14:08:22,715 [XWiki Solr index thread] WARN o.a.p.p.f.PDType0Font - No Unicode mapping for CID+32 (32) in font ABCDEE+Audi Type Extended 2021-11-29 14:08:22,715 [XWiki Solr index thread] WARN o.a.p.p.f.PDCIDFontType2 - Failed to find a character mapping for 32 in ABCDEE+Audi Type Extended [...] 2021-11-29 14:08:53,384 [http-nio-8080-exec-3 - http://127.0.0.1:8383/webjars/wiki%3Axwiki/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0] ERROR ebJarsResourceReferenceHandler - Failed to read resource [font-awesome/4.7.0/fonts/fontawesome-webfont.woff2] org.xwiki.resource.ResourceReferenceHandlerException: Failed to read resource [font-awesome/4.7.0/fonts/fontawesome-webfont.woff2] at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.serveResource(AbstractServletResourceReferenceHandler.java:180) at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.handle(AbstractServletResourceReferenceHandler.java:85) at org.xwiki.resource.internal.DefaultResourceReferenceHandlerChain.handleNext(DefaultResourceReferenceHandlerChain.java:79) at org.xwiki.resource.internal.AbstractResourceReferenceHandlerManager.handle(AbstractResourceReferenceHandlerManager.java:82) at org.xwiki.resource.servlet.ResourceReferenceHandlerServlet.handleResourceReference(ResourceReferenceHandlerServlet.java:159) at org.xwiki.resource.servlet.ResourceReferenceHandlerServlet.service(ResourceReferenceHandlerServlet.java:87) at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63) 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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:462) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:356) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316) at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:145) 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:196) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:624) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1673) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:371) at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:845) at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:750) at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:406) at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:384) at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96) at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1159) at org.apache.commons.io.IOUtils.copy(IOUtils.java:878) at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1135) at org.apache.commons.io.IOUtils.copy(IOUtils.java:854) at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.serveResource(AbstractServletResourceReferenceHandler.java:178) ... 35 common frames omitted Caused by: java.io.IOException: Broken pipe at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method) at java.base/sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:113) at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:79) at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:50) at java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:462) at org.apache.tomcat.util.net.NioChannel.write(NioChannel.java:142) at org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:118) at org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:167) at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1360) at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:718) at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:538) at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:482) at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:632) at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:127) at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:229) at org.apache.coyote.Response.doWrite(Response.java:614) at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:358) ... 45 common frames omitted WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl (file:/usr/local/tomcat/webapps/ROOT/WEB-INF/lib/velocity-engine-core-2.2.jar) to method sun.util.calendar.ZoneInfo.getOffset(long) WARNING: Please consider reporting this to the maintainers of org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release
Another ERROR:
2022-04-20 08:52:47,949 [http-nio-8080-exec-7 - http://127.0.0.1:8383/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/emoji/emoji.json?t=M2U8] ERROR ebJarsResourceReferenceHandler - Failed to read resource [application-ckeditor-webjar/1.61/plugins/emoji/emoji.json] org.xwiki.resource.ResourceReferenceHandlerException: Failed to read resource [application-ckeditor-webjar/1.61/plugins/emoji/emoji.json] at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.serveResource(AbstractServletResourceReferenceHandler.java:184) at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.handle(AbstractServletResourceReferenceHandler.java:86) at org.xwiki.resource.internal.DefaultResourceReferenceHandlerChain.handleNext(DefaultResourceReferenceHandlerChain.java:79) at org.xwiki.resource.internal.AbstractResourceReferenceHandlerManager.handle(AbstractResourceReferenceHandlerManager.java:82) at org.xwiki.resource.servlet.ResourceReferenceHandlerServlet.handleResourceReference(ResourceReferenceHandlerServlet.java:159) at org.xwiki.resource.servlet.ResourceReferenceHandlerServlet.service(ResourceReferenceHandlerServlet.java:87) at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:711) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:353) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:313) at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:145) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:353) at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:783) at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:688) at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:388) at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:366) at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96) at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1310) at org.apache.commons.io.IOUtils.copy(IOUtils.java:978) at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1282) at org.apache.commons.io.IOUtils.copy(IOUtils.java:953) at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.serveResource(AbstractServletResourceReferenceHandler.java:181) ... 35 common frames omitted Caused by: java.io.IOException: Broken pipe at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method) at java.base/sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:113) at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:79) at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:50) at java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:462) at org.apache.tomcat.util.net.NioChannel.write(NioChannel.java:135) at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1384) at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:773) at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:593) at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:537) at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:547) at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:84) at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:194) at org.apache.coyote.Response.doWrite(Response.java:615) at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:340) ... 45 common frames omitted
Last ERRORS (here without trace) observed before an outtake:
2022-04-19 08:17:53,191 [http-nio-8080-exec-8 - http://127.0.0.1:8383/webjars/wiki%3Axwiki/jquery/2.2.4/jquery.min.js?r=1] ERROR ebJarsResourceReferenceHandler - Failed to read resource [jquery/2.2.4/jquery.min.js] org.xwiki.resource.ResourceReferenceHandlerException: Failed to read resource [jquery/2.2.4/jquery.min.js] [...Trace...] 2022-04-19 08:17:53,232 [http-nio-8080-exec-7 - http://127.0.0.1:8383/webjars/wiki%3Axwiki/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0] ERROR ebJarsResourceReferenceHandler - Failed to read resource [font-awesome/4.7.0/fonts/fontawesome-webfont.woff2] org.xwiki.resource.ResourceReferenceHandlerException: Failed to read resource [font-awesome/4.7.0/fonts/fontawesome-webfont.woff2] [...Trace...] 2022-04-19 08:17:53,529 [http-nio-8080-exec-5 - http://127.0.0.1:8383/webjars/wiki%3Axwiki/jstree/3.3.8/jstree.min.js] ERROR ebJarsResourceReferenceHandler - Failed to read resource [jstree/3.3.8/jstree.min.js] org.xwiki.resource.ResourceReferenceHandlerException: Failed to read resource [jstree/3.3.8/jstree.min.js] [...Trace...] 2022-04-19 08:17:53,966 [http-nio-8080-exec-5 - http://127.0.0.1:8383/webjars/wiki%3Axwiki/selectize.js/0.12.5/js/standalone/selectize.min.js] ERROR ebJarsResourceReferenceHandler - Failed to read resource [selectize.js/0.12.5/js/standalone/selectize.min.js] org.xwiki.resource.ResourceReferenceHandlerException: Failed to read resource [selectize.js/0.12.5/js/standalone/selectize.min.js] [...Trace...]
However those were the last recorded error messages, but the XWiki has been used by two or three users with together around 10 page views until 11:11 before it was noticed that the XWiki was down at around 11:36.
As already written the outtakes occur very irregularly. I could not find any connection with the reboots or the container recreations (after an update to a new image).
We would be very grateful if you could help us to get the wiki into a stable state. Otherwise we would have to switch to another software.
If you need more information about the configuration or messages from the logs, I can provide them.