Min. ports needed for headless AWT/Swing

Aryeh Friedman aryeh.friedman at gmail.com
Wed Jul 1 12:57:00 UTC 2020 

On Wed, Jul 1, 2020 at 8:54 AM Ronald Klop <ronald-lists at klop.ws> wrote:

>
>
> *Van:* Aryeh Friedman <aryeh.friedman at gmail.com>
> *Datum:* woensdag, 1 juli 2020 14:36
> *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 8:30 AM Ronald Klop <ronald-lists at klop.ws> wrote:
>
>>
>> Van: Aryeh Friedman <aryeh.friedman at gmail.com>
>> Datum: woensdag, 1 juli 2020 14:03
>> 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 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
>>
>> In an earlier message you talked about "setenv DISPLAY 192.168.11.20:0.0".
>> That is the IP address of your desktop. So the X server must be running on
>> your desktop.
>>
>> You want the VM to screencapture the screen of the desktop? Or do you
>> want the VM to screencapture the screen of the VM?
>
>
> On the desktop... finally got it to capture the screeen on the desktop via
> what I tried above but now have a second problem with is the audio capture
> is there anyway to make the following Java snippet work with a remote mic
> (works fine on the desktop with a local mic on dsp2.0)?
>
>                 fmt=new AudioFormat(160000,8,2,true,true);
>                 mic=AudioSystem.getTargetDataLine(fmt);
>                 mic.open(fmt);
>                 mic.start();
> --
> Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
>
>
> Good that it is solved. Would you mind sharing what the solution was?
>

Adding -- -listen tcp to my call to startx on the desktop (I was confused
about which machine was the server and which was the client since the
relationship is reverse of the normal order.... i.e. the server is the
local machine and the client is the remote one not the other way around for
X)


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

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