presentation conversion fails after update to 2.2.17

[rottaran]

Describe the bug
The default presentation is no longer shown. Uploading a new presentation PDF hangs without error message in the HTML5 client.

To Reproduce
Steps to reproduce the behavior:

1. update BBB to 2.2.17
2. start a session
3. no default presentation slides are visible

/var/log/syslog

Jun 17 19:50:13  run-prod.sh[1829]: 2020-06-17T19:50:13.409+02:00 INFO  o.b.p.DocumentConversionServiceImp -  --analytics--data={"current":true,"filename":"default.pdf","logCode":"presentation_conversion_start","authzToken":"preupload-download-authz-token","meetingId":"736ba4c820f3415549098a42a0ecf8b5ae148ba2-1592416207749"
,"message":"Start presentation conversion.","podId":"DEFAULT_PRESENTATION_POD","presId":"d2d9a672040fbde2a47a10
bf6c37b6a4b5ae187f-1592416208394"}
Jun 17 19:50:13  run-prod.sh[1829]: Exception in thread "default.pdf" java.lang.NullPointerException
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.bigbluebutton.presentation.SupportedDocumentFilter.isSupported(SupportedDocumentFilter.java:42)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.bigbluebutton.presentation.DocumentConversionServiceImp.processDocumentStart(DocumentConversionServiceImp.java:59)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.bigbluebutton.presentation.DocumentConversionServiceImp.processDocument(DocumentConversionServiceImp.java:54)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.bigbluebutton.presentation.DocumentConversionService$processDocument.call(Unknown Source)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.bigbluebutton.web.services.PresentationService$_closure5$_closure16.doCall(PresentationService.groovy:85)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.bigbluebutton.web.services.PresentationService$_closure5$_closure16.doCall(PresentationService.groovy)
Jun 17 19:50:13  run-prod.sh[1829]: #011at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Jun 17 19:50:13  run-prod.sh[1829]: #011at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Jun 17 19:50:13  run-prod.sh[1829]: #011at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Jun 17 19:50:13  run-prod.sh[1829]: #011at java.lang.reflect.Method.invoke(Method.java:498)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
Jun 17 19:50:13  run-prod.sh[1829]: #011at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:264)
Jun 17 19:50:13  run-prod.sh[1829]: #011at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
Jun 17 19:50:13  run-prod.sh[1829]: #011at groovy.lang.Closure.call(Closure.java:418)
Jun 17 19:50:13  run-prod.sh[1829]: #011at groovy.lang.Closure.call(Closure.java:412)
Jun 17 19:50:13  run-prod.sh[1829]: #011at org.codehaus.groovy.runtime.DefaultGroovyMethods$2.run(DefaultGroovyMethods.java:15553)
Jun 17 19:50:13  run-prod.sh[1829]: #011at java.util.TimerThread.mainLoop(Timer.java:555)
Jun 17 19:50:13  run-prod.sh[1829]: #011at java.util.TimerThread.run(Timer.java:505)

bbb-conf --check

bbb-conf --check

BigBlueButton Server 2.2.17 (2034)
                    Kernel version: 4.15.0-106-generic
                      Distribution: Ubuntu 16.04.6 LTS (64-bit)
                            Memory: 16359 MB
                         CPU cores: 8

/usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties (bbb-web)
       bigbluebutton.web.serverURL: https://bbb.XXX.de
                defaultGuestPolicy: ALWAYS_ACCEPT
                 svgImagesRequired: true

/etc/nginx/sites-available/bigbluebutton (nginx)
                       server name: bbb.XXX.de
                              port: 80, [::]:80
                              port: 443 ssl
                    bbb-client dir: /var/www/bigbluebutton

/var/www/bigbluebutton/client/conf/config.xml (bbb-client)
                Port test (tunnel): rtmp://bbb.XXX.de
                              red5: bbb.XXX.de
              useWebrtcIfAvailable: true

/opt/freeswitch/etc/freeswitch/vars.xml (FreeSWITCH)
                       local_ip_v4: XXX
                   external_rtp_ip: XXX
                   external_sip_ip: XXX

/opt/freeswitch/etc/freeswitch/sip_profiles/external.xml (FreeSWITCH)
                        ext-rtp-ip: $${local_ip_v4}
                        ext-sip-ip: $${local_ip_v4}
                        ws-binding: :5066
                       wss-binding: XXX:7443

/usr/local/bigbluebutton/core/scripts/bigbluebutton.yml (record and playback)
                     playback_host: bbb.XXX.de
                 playback_protocol: https
                            ffmpeg: 4.2.2-1bbb1~ubuntu16.04

/etc/bigbluebutton/nginx/sip.nginx (sip.nginx)
                        proxy_pass: XXX

/usr/local/bigbluebutton/bbb-webrtc-sfu/config/default.yml (Kurento SFU)
                        kurento.ip: XXX
                       kurento.url: ws://127.0.0.1:8888/kurento
                    kurento.sip_ip: XXX
                    localIpAddress: XXX
               recordScreenSharing: true
                     recordWebcams: true
                  codec_video_main: VP8
               codec_video_content: VP8

/usr/share/meteor/bundle/programs/server/assets/app/config/settings.yml (HTML5 client)
                             build: 937
                        kurentoUrl: wss://bbb.XXX.de/bbb-webrtc-sfu
                  enableListenOnly: true


# Potential problems described below

bbb-conf --status

nginx —————————————————► [✔ - active]
freeswitch ————————————► [✔ - active]
redis-server ——————————► [✔ - active]
bbb-apps-akka —————————► [✔ - active]
bbb-transcode-akka ————► [✔ - active]
bbb-fsesl-akka ————————► [✔ - active]
red5 ——————————————————► [✔ - active]
mongod ————————————————► [✔ - active]
bbb-html5 —————————————► [✔ - active]
bbb-webrtc-sfu ————————► [✔ - active]
kurento-media-server ——► [✔ - active]
etherpad ——————————————► [✔ - active]
bbb-web ———————————————► [✔ - active]
bbb-webhooks ——————————► [✔ - active]

ps aux contains

bigblue+  4427  0.0  0.4 940172 76952 ?        Sl   19:40   0:00 /usr/lib/libreoffice/program/soffice.bin --accept=socket,host=127.0.0.1,port=8100,tcpNoDelay=1;urp;StarOffice.ServiceManager --headless --invisible --nocrashreport --nodefault --nofirststartwizard --nolockcheck --nologo --norestore -env:UserInstallation=file:///tmp/.jodconverter_socket_host-127.0.0.1_port-8100_tcpNoDelay-1
bigblue+  4500  0.0  0.4 940176 76676 ?        Sl   19:40   0:00 /usr/lib/libreoffice/program/soffice.bin --accept=socket,host=127.0.0.1,port=8101,tcpNoDelay=1;urp;StarOffice.ServiceManager --headless --invisible --nocrashreport --nodefault --nofirststartwizard --nolockcheck --nologo --norestore -env:UserInstallation=file:///tmp/.jodconverter_socket_host-127.0.0.1_port-8101_tcpNoDelay-1
bigblue+  4586  0.0  0.4 940176 76436 ?        Sl   19:40   0:00 /usr/lib/libreoffice/program/soffice.bin --accept=socket,host=127.0.0.1,port=8102,tcpNoDelay=1;urp;StarOffice.ServiceManager --headless --invisible --nocrashreport --nodefault --nofirststartwizard --nolockcheck --nologo --norestore -env:UserInstallation=file:///tmp/.jodconverter_socket_host-127.0.0.1_port-8102_tcpNoDelay-1
bigblue+  4650  0.0  0.4 940172 76760 ?        Sl   19:41   0:00 /usr/lib/libreoffice/program/soffice.bin --accept=socket,host=127.0.0.1,port=8103,tcpNoDelay=1;urp;StarOffice.ServiceManager --headless --invisible --nocrashreport --nodefault --nofirststartwizard --nolockcheck --nologo --norestore -env:UserInstallation=file:///tmp/.jodconverter_socket_host-127.0.0.1_port-8103_tcpNoDelay-1
bigblue+  4718  0.0  0.4 940172 76872 ?        Sl   19:41   0:00 /usr/lib/libreoffice/program/soffice.bin --accept=socket,host=127.0.0.1,port=8104,tcpNoDelay=1;urp;StarOffice.ServiceManager --headless --invisible --nocrashreport --nodefault --nofirststartwizard --nolockcheck --nologo --norestore -env:UserInstallation=file:///tmp/.jodconverter_socket_host-127.0.0.1_port-8104_tcpNoDelay-1

[matiasilva]

Can you reproduce this on https://demo.bigbluebutton.org? This should be in https://groups.google.com/forum/#!forum/bigbluebutton-setup but OK for now. I've seen a few other issues and topics on the mailing lists. Have you tried looking elsewhere for a solution?

[rottaran]

It works on your demo server. The issue seems to be very randomly occuring over last months. Maybe not specific to 2.2.17 then. Last report I find solved by reinstalling everything. Thus, no clue what actually wents wrong there. I will continue to look around.

[matiasilva]

Keep us updated.

[rottaran]

In bbb-apps-akka.log I get

WARN  o.b.core.running.MeetingActor - ***** Cannot handle PresentationConversionRequestReceivedSysMsg
INFO  o.b.core2.AnalyticsActor - -- analytics -- {"envelope":{"name":"PresentationConversionRequestReceivedSysMsg","routing":{"sender":"bbb-web"},"timestamp":1592424433213},"core":{"header":{"name":"PresentationConversionRequestReceivedSysMsg","meetingId":"736ba4c820f3415549098a42a0ecf8b5ae148ba2-1592424428197","userId":"preupload-download-authz-token"},"body":{"podId":"DEFAULT_PRESENTATION_POD","presentationId":"d2d9a672040fbde2a47a10bf6c37b6a4b5ae187f-1592424428212","current":true,"presName":"default.pdf","downloadable":false,"authzToken":"preupload-download-authz-token"}}}

[rottaran]

We get no error message at all when creating the presentation directory fails in

bigbluebutton/bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy

Line 2117 in c33ed68

if (uploadDir != null) {

. In that case, the pres = null gets passed down to the java code and might cause the null pointer exception.

[basisbit]

The default.pdf not showing up as presentation actually can be seen on the demo/test servers occasionally when they are at high load. It seems like the conversion process takes too much time and then the default.pdf is not shown unless the presenter opens the add presentation dialog and selects the default.pdf

[rottaran]

I finally solved it. My mistake: /var/bigbluebutton was owned by root instead of the bigbluebutton account. Thus most stuff such as recoding worked in the existing subdirectories, but presentation upload created temporary folders directly in /var/bigbluebutton. The latter failed, of course.

The difficutly in tracking this down is the missing error report in ApiController.groovy as I guessed right above. Maybe, yet another ownership test in bbb-conf --check would be helpful too :-)

[matiasilva]

Excellent detective work! I'll add this to the docs for others who may have a similar problem. Closing now :) Feel free to join the mailing lists if you have any more questions.

[danielblignaut]

I also ran into this issue. Just another hint - If you're enforcing https and running your server over https, check your logs for big blue button and you may find a java ssl handshake error. See this stackoverflow question for an example of the error:
https://stackoverflow.com/questions/9619030/resolving-javax-net-ssl-sslhandshakeexception-sun-security-validator-validatore

Basically, the way SSL connections work in Java is that you can only connect to trusted https sites. In order for a certificate to be trusted, you need to have it in your java cert store. To do that, follow the below tutorial but sub in your own domain.

https://confluence.atlassian.com/kb/how-to-import-a-public-ssl-certificate-into-a-jvm-867025849.html#HowtoimportapublicSSLcertificateintoaJVM-commandline

If you need help finding your java home directory, follow below:
https://www.baeldung.com/find-java-home

I then also had to ensure the SSL was added to NodeJS for meteor to access, following the details here:
#6139 (comment)

[junaidHassan84]

I have the same problem Everything is fine and Permission to
drwxr-xr-x 7823 bigbluebutton bigbluebutton 1970176 Oct 5 11:53 bigbluebutton

Seems fine STILL NOT ABLE TO OPEN DEFAULT Presentation or Uploaded presentation stuck on upload

Please help