<AWT Dev> RFR: 8025673: Disable X11 AWT toolkit

David DeHaven david.dehaven at oracle.com
Tue Oct 22 09:09:31 PDT 2013

Oops, you're right, it definitely crashes. I'll put that code back and take Artem's suggestion.


> Artem is correct. On Mac we can't start a GUI session via ssh, for example. Thus we choose the headless mode then. The isInAquaSession() is supposed to perform exactly this check. This logic needs to be preserved.
> --
> best regards,
> Anthony
> On 10/22/2013 01:23 PM, Artem Ananiev wrote:
>> Hi, David,
>> thanks for additional cleanup.
>> I have only one concern. Before the fix, we checked if there is an
>> active Aqua session. When no session was found, we falled back to
>> HToolkit. I think this logic should be preserved, but slightly
>> corrected: fall back to HeadlessToolkit (with CToolkit wrapped in).
>> Otherwise the only way to run headless on Mac will be to force it with
>> the system property. It works this way on Windows, but on Windows we're
>> sure that WToolkit can run even without a UI session. Is it also true on
>> Mac? Did you try to launch AWT without -Djava.awt.headless=true from
>> remote console with no users logged in?
>> Thanks,
>> Artem
>> On 10/22/2013 7:34 AM, David DeHaven wrote:
>>> Updated webrev for JDK (hotspot change is the same):
>>> http://cr.openjdk.java.net/~ddehaven/8025673/jdk.1/
>>> Changes since last version:
>>> - Moved to jdk8/build/jdk to save someone a merge headache, moved
>>> changes to CompileNativeLibs.gmk to libs/Awt2dLibraries.gmk
>>> - Removed HToolkit option and toolkit selection code from
>>> java_props_macosx.[ch]
>>> -DrD-
>>>> I want to do one more iteration of this. Based on feedback it seems I
>>>> can remove a bit more code from java_props_macosx.[ch] and make
>>>> things a bit cleaner.
>>>> -DrD-
>>>>> Thanks guys.
>>>>> Anthony, can you sponsor this for me?
>>>>> -DrD-
>>>>>> This fix looks fine to me as well.
>>>>>> --
>>>>>> best regards,
>>>>>> Anthony
>>>>>> On 10/20/2013 11:56 PM, David DeHaven wrote:
>>>>>>> CCing: build-dev, macosx-port-dev, hotspot-dev
>>>>>>> Request for review of JDK-8025673:
>>>>>>> https://bugs.openjdk.java.net/browse/JDK-8025673
>>>>>>> Proposed changes:
>>>>>>> http://cr.openjdk.java.net/~ddehaven/8025673/
>>>>>>> This change disables building libawt_xawt.dylib and
>>>>>>> libawt_headless.dylib on Mac since they are not used and not
>>>>>>> supported. There are too many challenges (and not enough time) in
>>>>>>> removing all X11 code from the Mac build at this time, so we're
>>>>>>> deferring complete removal for later (will be covered by
>>>>>>> JDK-8003900).
>>>>>>> A small change to hotspot is required as it was looking for
>>>>>>> libawt_xawt.dylib and if not found would set java.awt.headless to
>>>>>>> true. Since we don't build a headless only JRE on Mac I just have
>>>>>>> that method return false. I'm not sure how to handle changes to
>>>>>>> hotspot, can it be pushed along with the jdk changes? Without that
>>>>>>> change the Mac builds will be broken.
>>>>>>> Significant build system changes, build-dev guys are encouraged to
>>>>>>> comment...
>>>>>>> I tried excluding all sun/awt/X11 classes in
>>>>>>> CompileJavaClasses.gmk but that broke JNI header generation on
>>>>>>> platforms still using X11 and I couldn't use the big list of
>>>>>>> excluded files on Mac as that resulted in Java compilation errors,
>>>>>>> so I just added some logic to exclude everything on Mac and left
>>>>>>> the list in place everywhere else.
>>>>>>> The changes to CompileNativeLibraries.gmk will port to
>>>>>>> libs/AwtJava2dLibraries.gmk in jdk8/build, however there is a
>>>>>>> problem in the jdk8/build workspace where the build cannot find
>>>>>>> symbols in JNI libs so that issue needs to be resolved first. I've
>>>>>>> not had time to investigate that problem.
>>>>>>> Question for the AWT team, we still have this in java_props_md.c:
>>>>>>> 458     PreferredToolkit prefToolkit = getPreferredToolkit();
>>>>>>> 459     if (prefToolkit == CToolkit) {
>>>>>>> 460         sprops.awt_toolkit = "sun.lwawt.macosx.LWCToolkit";
>>>>>>> 461     } else {
>>>>>>> 462         // TODO: do we still need this?
>>>>>>> 463         sprops.awt_toolkit = "sun.awt.HToolkit";
>>>>>>> 464     }
>>>>>>> Is that necessary? Since we're now using libawt_lwawt in both
>>>>>>> headless and headful modes I would think we could remove the
>>>>>>> HToolkit option, but I'm not 100% certain about that.
>>>>>>> I've built and tested on Mac and a Linux VM (Ubuntu 12.04) and
>>>>>>> both seem to be working fine.
>>>>>>> JPRT run for Mac is in progress, I will submit one for all other
>>>>>>> platforms when it finishes building.
>>>>>>> -DrD-

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