Was your java install directly from the Ubuntu repos?  I believe if not mistaken Debain never used 9 or 10 and went directly to 11.  It may of been who ever put the apt package together labeled something wrong.  Also when you did the "apt install" did you select Open-JDK11 or default-jdk?  Default-jdk will install the latest jdk version.

aahepp@linux-one:~ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111      auto mode   1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111      manual mode   2            /usr/lib/jvm/java-8-oracle/jre/bin/java 1081      manual mode

Press <enter> to keep the current choice[*], or type selection number:
aahepp@linux-one:~ java -version
openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment (build 11.0.1+13-Ubuntu-3ubuntu3.18.10.1)
OpenJDK 64-Bit Server VM (build 11.0.1+13-Ubuntu-3ubuntu3.18.10.1, mixed mode, sharing)
aahepp@linux-one:~

May also be worth noting in the install tutorials that IcedTead is only needed for client side screen sharing.  If you are just setting up the server itself then that install is not needed.

On 2/3/19 6:40 AM, Alvaro wrote:
...in the terminal where i starting screen-sharing web-app, is already javaws,
as you can see in the video, but i will do after have lunch.

Look at, imagine we have only Java 11 installed, no any other java version,
but we install "icedtea-web", automatically will install jre 8, where is
javaws.
In all installation tutorials is the installation of openJava-8 and later icedtea-web.

All my OSes installed on his respective partitions, have OpenJava-8 and icedtea-web installed, and now am installing in each one OpenJava-11 and testing OM 4.0.8-536.

Right now 've finished test it on Ubuntu 18.04 with Java-11 with success recording. Please take a look the attached files. In the capture you can see that is installed
java-11 but "java -version" say java-10.


..............................




El dom, 03-02-2019 a las 17:43 +0700, Maxim Solodovnik escribió:
`javaws` in the terminal on the client (where you are starting screen-sharing web-app)

On Sun, 3 Feb 2019 at 16:49, Alvaro <[email protected] <mailto:[email protected]>> wrote:

...in Debian have Java-8 and Java-11.

...in Arch have Java-8, Java-9 and Java-11

...in Fedora 29 have Jav-8 and Java-11


..................

El dom, 03-02-2019 a las 16:01 +0700, Maxim Solodovnik escribió:
java version is absent in the log :(
do you have multiple java machines in the system?

can you run `javaws` and check 'About' dialog?

On Sun, 3 Feb 2019 at 14:33, Alvaro <[email protected] <mailto:[email protected]>> wrote:

...attached the screenshare log.


...............


El dom, 03-02-2019 a las 10:05 +0700, Maxim Solodovnik escribió:
Thanks for testing Alvaro :)
Can your share screenshare.log (I wonder how were you able to start webstart on java11 ....)

On Sun, 3 Feb 2019 at 01:40, Alvaro <[email protected] <mailto:[email protected]>> wrote:

...OM 5.0.0 with Java 11 also go fine.


...........................

El sáb, 02-02-2019 a las 19:37 +0100, Alvaro escribió:
Yes, it works as expected.

OM 4.0.8 - 536 - Java 11 - Debian 9

An now works with icedtea-web (i think so).
Please take a look the video:

https://drive.google.com/file/d/1oe0Y0KU90sOuYcOkR5mdvsEvDtk2M0W0


....................................



El dom, 03-02-2019 a las 00:40 +0700, Maxim Solodovnik escribió:
According to my tests latest snapshot should work as expected under java11
Please reopen JIRA with additional steps if it is not true

On Sun, 3 Feb 2019 at 00:39, Alvaro <[email protected] <mailto:[email protected]>> wrote:

...should test OM 4.0.8 snapshot 536 with
Java 11 when you finish.


.................


El sáb, 02-02-2019 a las 18:26 +0100, Alvaro escribió:
...OK.

................

El dom, 03-02-2019 a las 00:00 +0700, Maxim Solodovnik escribió:
According to https://stackoverflow.com/questions/51704652/how-to-ru
n-
existing-java-web-start-application-in-java-10-or-later-java-11
javaws is no longer available :(

So java8 MUST be installed on client for screen-sharing (4.0.8)
Will try to find alternative for OM5

On Sat, 2 Feb 2019 at 23:41, Maxim Solodovnik <[email protected] <mailto:[email protected]>


wrote:

https://issues.apache.org/jira/browse/OPENMEETINGS-2006

On Sat, 2 Feb 2019 at 20:49, Alvaro <[email protected] <mailto:[email protected]>> wrote:

...sorry, in Debian 9 is really OpenJava 11, is in
Arch Linux where the repos say OpenJava 11, but "java -version"
say 10.


................


El sáb, 02-02-2019 a las 14:33 +0100, Alvaro escribió:
...both.

For example in Debian 9 the repos show "OpenJava 11", but if
you
install it and later type "java -version" there show "java
10..."


...............

El sáb, 02-02-2019 a las 19:05 +0700, Maxim Solodovnik
escribió:
Hello Alvaro,

Both Java9 and Java10 are doesn't supported anymore, too
old
:)

Actual Java versions:
Java 8 - almost EOL
Java 11.

Have you tried to run OM server with different Java
versions?
Or
screen-sharing app? or both?

On Sat, 2 Feb 2019 at 18:59, Alvaro <[email protected] <mailto:[email protected]>>
wrote:

Hello Maxim,

I've tested OM 4.0.x and OM 5.0.0 with different OpenJava
versions,
on
Arch Linux.
Let me explain.


# Java 8 - works right OM 4.0.x and OM 5.0.0, both with
icedtea-
web.

# Java 9 - works right OM 4.0.x and OM 5.0.0. Icedtea-web
no
work,
it
is neccesary go to javaws.

# Java 10 - only works OM 5.0.0, OM 4.0.x don't run.
Icedtea-web
no
works and no find the javaws file in java 10...then?


OpenJava 9 is not at various OS repositorys, for example
Debian.
Go
from Java 8 to 10.

Alvaro






--
WBR
Maxim aka solomax









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Maxim aka solomax



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Maxim aka solomax



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Maxim aka solomax

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