Demo server screensharing: file not found error

[Claudia Beleites]

Dear all,

(I'm not sure whether this is the correct mailing list for the question: Looks to me like a server setup question, but it affects https://demo.bigbluebutton.org)

I was trying the demo server (before attempting to install our own instance of bbb) and ran into trouble with screensharing:

When trying to start the screensharing (screenshare.jnlp) I get the following exception:

java.io.FileNotFoundException: https://demo.bigbluebutton.org/screenshare/lib/ffmpeg-linux-x86_64-h264.jar
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1890)
    at sun.net.www.protocol.http.HttpURLConnection.access$200(HttpURLConnection.java:91)
    at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1484)
    at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1482)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessController.doPrivilegedWithCombiner(AccessController.java:782)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1481)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263)
    at com.sun.deploy.net.HttpUtils.followRedirects(Unknown Source)
    at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)
    at com.sun.deploy.net.BasicHttpRequest.doGetRequestEX(Unknown Source)
    at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
    at com.sun.deploy.net.DownloadEngine.downloadResource(Unknown Source)
    at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
    at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)
    at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

I'm on xubuntu 16.04 64bit, using Oracle Java 8 Web Start for executing the .jnlp.

Many thanks for your help,
Claudia

[Fred Dixon]

Hi Claudia,

Can you try https://demo.bigbluebutton.org/ again and let us know if you still encounter her problem.

Regards,... Fred

On Mon, Nov 6, 2017 at 12:26 PM, Claudia Beleites <inte...@chemometrix.eu> wrote:

...

[Message clipped]  

--

BigBlueButton Developer

http://bigbluebutton.org/

@bigbluebutton

[Claudia Beleites]

Hi Fred,

I seem to get a bit further now, but it still does not work:

No more FileNotFoundException,
I see a blue cross flashing over the screen, then
the floating "screensharing: presentation preview" window says:

Die Bildschirmfreigabe wurde unerwartet beendet.

Wählen Sie 'Abbrechen' und versuchen Sie es erneut.

Rough translation:  screensharing terminated unexpectedly. Choose "cancel" and try again.

(Trying again does not help)

- Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0

In case that helps, I started the jnlp manually with `javaws --verbose`:

$ javaws -verbose  screenshare.jnlp
Java(TM) Web Start 11.151.2.12-fcs Launching: /usr/lib/jvm/java-8-oracle/jre/bin/java
/usr/lib/jvm/java-8-oracle/jre/bin/java
 -classpath
 /usr/lib/jvm/java-8-oracle/jre/lib/deploy.jar
 -Djava.security.policy=file:/usr/lib/jvm/java-8-oracle/jre/lib/security/javaws.policy
 -DtrustProxy=true
 -Xverify:remote
 -Djnlpx.home=/usr/lib/jvm/java-8-oracle/jre/bin
 -Djava.security.manager
 -Djnlpx.origFilenameArg=screenshare.jnlp
 -Djnlpx.remove=true
 -Dsun.awt.warmup=true
 -Xbootclasspath/a:/usr/lib/jvm/java-8-oracle/jre/lib/javaws.jar:/usr/lib/jvm/java-8-oracle/jre/lib/deploy.jar:/usr/lib/jvm/java-8-oracle/jre/lib/plugin.jar
 -Djnlpx.splashport=49175
 -Djnlpx.jvm=/usr/lib/jvm/java-8-oracle/jre/bin/java
 com.sun.javaws.Main
 -verbose
 -notWebJava
 /tmp/javawQNwave

[x11grab @ 0x7f8d34121e40] device: :0.0+0,0 -> display: :0.0 x: 0 y: 0 width: 2950 height: 1040
[x11grab @ 0x7f8d34121e40] shared memory extension found
Input #0, x11grab, from ':0.0+0,0':
  Duration: N/A, start: 1510078192.941110, bitrate: 490880 kb/s
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 2950x1040, 490880 kb/s, 5 tbr, 1000k tbn, 5 tbc

(I'm on a dual screen setup, but switching to single screen does not help)

[Fred Dixon]

We're getting closer.  

What display system (MIR, Wayland, etc.) are you running on Ubuntu?

Regards,... Fred

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