Min. ports needed for headless AWT/Swing

[Aryeh Friedman]

On Wed, Jul 1, 2020 at 7:58 AM Ronald Klop <ronald-lists at klop.ws> wrote:

>
>
> *Van:* Aryeh Friedman <aryeh.friedman at gmail.com>
> *Datum:* woensdag, 1 juli 2020 13:33
> *Aan:* Ronald Klop <ronald-lists at klop.ws>
> *CC:* freebsd-java at freebsd.org, Michael Osipov <1983-01-06 at gmx.net>
> *Onderwerp:* Re: Min. ports needed for headless AWT/Swing
>
>
>
> On Wed, Jul 1, 2020 at 5:52 AM Ronald Klop <ronald-lists at klop.ws> wrote:
>
>> *Van:* Aryeh Friedman <aryeh.friedman at gmail.com>
>> *Datum:* maandag, 29 juni 2020 20:59
>> *Aan:* Michael Osipov <1983-01-06 at gmx.net>
>> *CC:* freebsd-java at freebsd.org
>> *Onderwerp:* Re: Min. ports needed for headless AWT/Swing
>>
>> On Mon, Jun 29, 2020 at 2:28 PM Michael Osipov <1983-01-06 at gmx.net>
>> wrote:
>>
>> > Am 2020-06-29 um 17:43 schrieb Aryeh Friedman:
>> > > I have a java application that works fine with setenv DISPLAY :0.0 on
>> my
>> > > desktop FreeBSD 12.1 (amd64) [with Xfce4] but when I attempt to run
>> the
>> > > same app on a VM that has the minimum ports needed to install OpenJDK
>> 8
>> > and
>> > > Tomcat I get an exception saying that it can't connect to the X server
>> > even
>> > > though I did setenv DISPLAY desktop:0.0 (and xhost + on the desktop).
>> > > Note it is the same user on both machines (NIS/NFS password DB/home
>> dirs)
>> > > doing the running on both machines but is a different user then the
>> one
>> > > logged in at the console (I do all my development in a separate
>> account)
>> >
>> > Are you look for "-Djava.awt.headless=true"?
>> >
>>
>> Since this is a screen capture/recording program (which I am the
>> developer)
>> I need to be able to capture the console (running X) that I am currently
>> on.   So the question is what is the minimum set of ports/packages I need
>> to install on the VM to make it see and X server?   It should be noted the
>> program has no GUI but does use java.awt.Robot#createScreenCapture (using
>> the full screen resolution as it's bounds) individual frames of the longer
>> video.
>>
>> Here is the specific exception I am attempting to fix:
>> On desktop (192.168.11.20)
>> % xhost +
>>
>> On VM (192.168.11.4):
>> % setenv DISPLAY 192.168.11.20:0.0
>> % java
>>
>> -javaagent:/usr/local/share/java/classes/jacocoagent.jar=destfile=/usr/home/aryeh/fnwe-scap-1a1.C036/jacoco.exec,jmx=true,excludes=thistest/*:test/*
>> -cp
>>
>> /usr/home/aryeh/fnwe-scap-1a1.C036/scrap/www/WEB-INF/lib/fnwe-scap-1a1.jar:/usr/local/share/java/classes/thisTest.jar:/usr/local/share/java/classes/pcCommon.jar:/usr/local/share/java/classes/pcUtil.jar
>> test.TestMain
>>
>> Result of the jvm invocation on the VM (not it works no problem su(do)'ing
>> to another account on the desktop if I do setenv DISPLAY :0.0):
>>
>> Caused by: java.awt.AWTError: Can't connect to X11 window server using
>> '192.168.11.20:0.0' as the value of the DISPLAY variable.
>> at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
>> at
>> sun.awt.X11GraphicsEnvironment.access$200(X11GraphicsEnvironment.java:65)
>> at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:115)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:74)
>> at java.lang.Class.forName0(Native Method)
>> at java.lang.Class.forName(Class.java:264)
>> at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:103)
>> at
>>
>> java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:82)
>> at test.scap.TestVideoFrame.testCaptureFrame(TestVideoFrame.java:76)
>>
>> _______________________________________________
>> > freebsd-java at freebsd.org mailing list
>> > https://lists.freebsd.org/mailman/listinfo/freebsd-java
>> > To unsubscribe, send any mail to "freebsd-java-unsubscribe at freebsd.org"
>> >
>>
>>
>> --
>> Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
>> _______________________________________________
>> freebsd-java at freebsd.org mailing list
>> https://lists.freebsd.org/mailman/listinfo/freebsd-java
>> To unsubscribe, send any mail to "freebsd-java-unsubscribe at freebsd.org"
>> ------------------------------
>>
>>
>> Hi,
>>
>> Can you start any other X application on the VM using the DISPLAY
>> setting? Like /usr/ports/x11/xeyes. Than you know if it is something with X
>> instead of something with Java. I guess it is something with X.
>> I guess your desktop is not listening for external connections to the X
>> server or your routing between the VM and the desktop does not work.
>> Or start a X server in the VM and use DISPLAY=:0.0 again.
>>
>
> Don't have any X components installed except for the ones required by
> "make/make install" on openjdk8.   The reason for this post in the first
> place was to figure out the minimum set of ports needed to get a working
> DISPLAY variable in the first place.
>
>
> --
> Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
>
>
> I'm 99% sure you don't need any additional ports to get a working DISPLAY
> variable.
>
> It will probably help to start your X server with "-listen tcp". But I
> don't have enough information to be sure about that and how to configure
> that in your setup.
>

I think that might work if in fact there was an X server on the VM:

root at dnixon:~ # X -listen-tcp
X: Command not found.
root at dnixon:~ # ls /usr/local/bin/X*
ls: No match.
root at dnixon:~ # ls /usr/local/bin/x*
/usr/local/bin/x265 /usr/local/bin/xicclu /usr/local/bin/xmlcatalog
/usr/local/bin/xslt-config
/usr/local/bin/xaegis /usr/local/bin/xjc /usr/local/bin/xmlcatmgr
/usr/local/bin/xsltproc
/usr/local/bin/xft-config /usr/local/bin/xkbcomp /usr/local/bin/xmllint
/usr/local/bin/xsubpp
/usr/local/bin/xgettext /usr/local/bin/xml2-config /usr/local/bin/xmlwf
/usr/local/bin/xxd
root at dnixon:~ # ls /usr/local/sbin/x*
ls: No match.
root at dnixon:~ # ls /usr/local/sbin/X*
ls: No match.
root at dnixon:~ # java -version
openjdk version "1.8.0_252"
OpenJDK Runtime Environment (build 1.8.0_252-b09)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)


-- 
Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org