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JavaFX example hangs on Mac OS X Yosemite #357

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defranke opened this issue Jun 21, 2015 · 14 comments
Open

JavaFX example hangs on Mac OS X Yosemite #357

defranke opened this issue Jun 21, 2015 · 14 comments

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@defranke
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Hi,
when trying to launch the JavaFX example WebCamAppLauncher the programs hangs while searching for devices. I guess the problem is related to #318.

I get the following output:

17:39:07.222 [JavaFX Application Thread] INFO  com.github.sarxos.webcam.Webcam - WebcamDefaultDriver capture driver will be used
17:39:07.229 [webcam-discovery-service] DEBUG c.g.s.w.d.b.WebcamDefaultDriver - Searching devices

and the output from jstack:

2015-06-21 17:41:57
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.40-b25 mixed mode):

"Attach Listener" #19 daemon prio=9 os_prio=31 tid=0x00007ff334aa1800 nid=0x7f17 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"atomic-processor-1" #17 daemon prio=5 os_prio=31 tid=0x00007ff335208800 nid=0xc403 runnable [0x00000001269f5000]
   java.lang.Thread.State: RUNNABLE
    at com.github.sarxos.webcam.ds.buildin.natives.OpenIMAJGrabber.getVideoDevices(Native Method)
    at com.github.sarxos.webcam.ds.buildin.WebcamDefaultDriver$GetDevicesTask.handle(WebcamDefaultDriver.java:93)
    at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.run(WebcamProcessor.java:81)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"webcam-discovery-service" #16 daemon prio=5 os_prio=31 tid=0x00007ff3351ff000 nid=0xc107 waiting on condition [0x00000001268f2000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x0000000796c32fc0> (a java.util.concurrent.SynchronousQueue$TransferQueue)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.SynchronousQueue$TransferQueue.awaitFulfill(SynchronousQueue.java:762)
    at java.util.concurrent.SynchronousQueue$TransferQueue.transfer(SynchronousQueue.java:695)
    at java.util.concurrent.SynchronousQueue.take(SynchronousQueue.java:924)
    at com.github.sarxos.webcam.WebcamProcessor$AtomicProcessor.process(WebcamProcessor.java:70)
    at com.github.sarxos.webcam.WebcamProcessor.process(WebcamProcessor.java:140)
    at com.github.sarxos.webcam.WebcamTask.process(WebcamTask.java:46)
    at com.github.sarxos.webcam.ds.buildin.WebcamDefaultDriver$GetDevicesTask.getDevices(WebcamDefaultDriver.java:79)
    at com.github.sarxos.webcam.ds.buildin.WebcamDefaultDriver.getDevices(WebcamDefaultDriver.java:124)
    at com.github.sarxos.webcam.WebcamDiscoveryService$WebcamsDiscovery.call(WebcamDiscoveryService.java:36)
    at com.github.sarxos.webcam.WebcamDiscoveryService$WebcamsDiscovery.call(WebcamDiscoveryService.java:26)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"Thread-4" #15 daemon prio=5 os_prio=31 tid=0x00007ff3351ec800 nid=0x9103 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"JavaFX Application Thread" #14 prio=5 os_prio=31 tid=0x00007ff3349e9000 nid=0x713 waiting on condition [0x00007fff57c14000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x0000000796ba5158> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1465)
    at java.util.concurrent.Executors$DelegatedExecutorService.awaitTermination(Executors.java:675)
    at com.github.sarxos.webcam.WebcamDiscoveryService.getWebcams(WebcamDiscoveryService.java:113)
    - locked <0x0000000796b16f60> (a java.lang.Class for com.github.sarxos.webcam.Webcam)
    at com.github.sarxos.webcam.Webcam.getWebcams(Webcam.java:874)
    - locked <0x0000000796b16f60> (a java.lang.Class for com.github.sarxos.webcam.Webcam)
    at com.github.sarxos.webcam.Webcam.getWebcams(Webcam.java:847)
    at com.github.sarxos.webcam.Webcam.getWebcams(Webcam.java:826)
    at com.bazinga.WebCamAppLauncher.createTopPanel(WebCamAppLauncher.java:147)
    at com.bazinga.WebCamAppLauncher.start(WebCamAppLauncher.java:99)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(LauncherImpl.java:863)
    at com.sun.javafx.application.LauncherImpl$$Lambda$53/1742046688.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl$$Lambda$49/362249184.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295)
    at com.sun.javafx.application.PlatformImpl$$Lambda$51/627756177.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294)
    at com.sun.javafx.application.PlatformImpl$$Lambda$50/2115686102.run(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)

"Thread-2" #13 daemon prio=5 os_prio=31 tid=0x00007ff335997000 nid=0x6213 in Object.wait() [0x00000001226ba000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0000000796290488> (a java.lang.StringBuilder)
    at java.lang.Object.wait(Object.java:502)
    at com.sun.glass.ui.InvokeLaterDispatcher.run(InvokeLaterDispatcher.java:126)
    - locked <0x0000000796290488> (a java.lang.StringBuilder)

"QuantumRenderer-0" #11 daemon prio=5 os_prio=31 tid=0x00007ff334a2d800 nid=0x4f03 waiting on condition [0x00000001220a8000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x0000000796155920> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
    at java.lang.Thread.run(Thread.java:745)

"JavaFX-Launcher" #10 prio=5 os_prio=31 tid=0x00007ff3341cd000 nid=0x4d03 waiting on condition [0x0000000121fa5000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000007962a9e90> (a java.util.concurrent.CountDownLatch$Sync)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
    at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
    at com.sun.javafx.application.PlatformImpl.runAndWait(PlatformImpl.java:337)
    at com.sun.javafx.application.PlatformImpl.runAndWait(PlatformImpl.java:307)
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:856)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$152(LauncherImpl.java:182)
    at com.sun.javafx.application.LauncherImpl$$Lambda$2/2008017533.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:745)

"Monitor Ctrl-Break" #9 daemon prio=5 os_prio=31 tid=0x00007ff334854800 nid=0x4b03 runnable [0x0000000121bac000]
   java.lang.Thread.State: RUNNABLE
    at java.net.PlainSocketImpl.socketAccept(Native Method)
    at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:404)
    at java.net.ServerSocket.implAccept(ServerSocket.java:545)
    at java.net.ServerSocket.accept(ServerSocket.java:513)
    at com.intellij.rt.execution.application.AppMain$1.run(AppMain.java:90)
    at java.lang.Thread.run(Thread.java:745)

"Service Thread" #8 daemon prio=9 os_prio=31 tid=0x00007ff334013800 nid=0x4703 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x00007ff33482f800 nid=0x4503 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x00007ff33482e800 nid=0x4303 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x00007ff335852000 nid=0x4103 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007ff335025000 nid=0x400f runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007ff33400b000 nid=0x2b03 in Object.wait() [0x000000011fa4c000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0000000795586f58> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
    - locked <0x0000000795586f58> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

"Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007ff33481e800 nid=0x2903 in Object.wait() [0x000000011f949000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x0000000795586998> (a java.lang.ref.Reference$Lock)
    at java.lang.Object.wait(Object.java:502)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
    - locked <0x0000000795586998> (a java.lang.ref.Reference$Lock)

"main" #1 prio=5 os_prio=31 tid=0x00007ff335009000 nid=0xd03 waiting on condition [0x000000010914c000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x0000000795f88900> (a java.util.concurrent.CountDownLatch$Sync)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
    at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:200)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:143)
    at javafx.application.Application.launch(Application.java:252)
    at com.bazinga.WebCamAppLauncher.main(WebCamAppLauncher.java:297)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

"VM Thread" os_prio=31 tid=0x00007ff33481d800 nid=0x2703 runnable 

"GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007ff335800800 nid=0x1f03 runnable 

"GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007ff335801800 nid=0x2103 runnable 

"GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007ff335802000 nid=0x2303 runnable 

"GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007ff335802800 nid=0x2503 runnable 

"VM Periodic Task Thread" os_prio=31 tid=0x00007ff33583e800 nid=0x4903 waiting on condition 

JNI global references: 515

Searching for Webcams in a separate thread like this works without problems:

new Thread(() -> {
    for(Webcam w : Webcam.getWebcams()) {
        System.out.println(w.getName());
    }
}).start();
This was referenced Jul 4, 2015
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@Greg767
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Greg767 commented Oct 6, 2015

Any solutions for this? I've tried to search for the webcams in a different thread, but its still freezing up.

@sarxos
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sarxos commented Oct 6, 2015

Hi @Greg767,

The issue is caused by the Apple limitation that allows some native code to run only on the main thread when using SWT, GWT or JavaFX.

Have you try starting your app with -XstartOnFirstThread JVM option? If this won't help you can also try w/a implemented by @phrack in his commit phrack/ShootOFF@2144100

@Greg767
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Greg767 commented Oct 6, 2015

Hey thanks for the quick reply. I just tried with -XstartOnFirstThread and it still hangs. I will look into that post.
By the way does it suppose to work with the built-in cam as well or it must have a USB cam?

@sarxos
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sarxos commented Oct 6, 2015

@Greg767,

In regards to:

By the way does it suppose to work with the built-in cam as well or it must have a USB cam?

Yes. It support both build-in and UVC :)

@Greg767
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Greg767 commented Oct 7, 2015

OK so finally what worked for me is that I switched to my Macbook to finalize the development and get the default cam in a Task, as per the code exemple. I didn't need to use -XstartOnFirstThread option.
Thanks a lot.

@hanggrian
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I am having a similar issue and I can confirm that putting -XstartOnFirstThread did not solve the problem.

@Greg767 can you please elaborate your solution?

@Greg767
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Greg767 commented Jun 3, 2016 •
edited
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For me it worked without that property on a Mac in netbeans and I used this code:
`
protected void initializeWebCam(final int webCamIndex) {
takeImageBtn.setDisable(true);
webcamDisposed = false;

    Task<Void> webCamTask = new Task<Void>() {

        @Override
        protected Void call() throws Exception {

            if (webCam != null) {
                disposeWebCamCamera();
            }

            for (Webcam w : Webcam.getWebcams()) {
                if(!w.getName().contains("FaceTime"))
                    webCam = w;
            }
            if(webCam == null)
                webCam = Webcam.getDefault();
            Dimension[] sizes = webCam.getViewSizes();
            webCam.setViewSize(sizes[sizes.length - 1]);
            webCam.open();

            startWebCamStream();

            return null;
        }
    };

    Thread webCamThread = new Thread(webCamTask);
    webCamThread.setDaemon(true);
    webCamThread.start();

}`

@hanggrian
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@Greg767 thanks for sharing the code. I think the clear solution here is to run webcam.getWebcams() on a separate thread. Webcam on my Mac works now although I'm still figuring out why webcam.close() throws NullPointerException.

@sarxos
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sarxos commented Jun 6, 2016 •
edited
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Hi @hendraanggrian,

Can you please elaborate more about this NullPointerException in close()? Especially, can you provide stack trace?

Is this NPE comes from close() internals, or just your webcam reference is null?

@hanggrian
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@sarxos I weirdly cannot reproduce the error, at this point everything works great with your library. Thanks!

@sarxos
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sarxos commented Jun 7, 2016

Cool, in case it manifest again please do not hesitate to report it :)

@james-d
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james-d commented Mar 16, 2017

I found that in general the FX Application Thread is prone to hanging if you interact with the web cam much at all on that thread. E.g. Webcam.close() or Webcam.getWebcams() seem to cause deadlock. (Mac OS X Sierra on a Macbook Pro with built-in camera). I haven't tested much (honestly, I don't actually use the library, I was just answering a StackOverflow question...), but I created a couple of wrapper classes that wrap the Webcam as a JavaFX service and a corresponding view. Not intended to be production quality, but if you are interested in adapting that as an example, feel free (just acknowledge, please). Gist at https://gist.github.com/james-d/f826c9f38d53628114124a56fb7c4557

@sarxos
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sarxos commented Mar 16, 2017

Hi @james-d,

Thank you for this contribution. Indeed many people from Webcam Capture community reported that using this API on Mac is somehow tricky.

In regards to your code - since there are lambdas in your code I had to update pom.xml to specify Java source and target compatibility:

<plugin>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>3.3</version>
  <configuration>
    <source>1.8</source>
    <target>1.8</target>
  </configuration>
</plugin>

Otherwise it gave me compilation error:

$ mvn clean install
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building WebCamTest 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ WebCamTest ---
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ WebCamTest ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/sarxos/workspace/webcam-capture/webcam-capture-examples/webcam-capture-javafx-service/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.3:compile (default-compile) @ WebCamTest ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 3 source files to /home/sarxos/workspace/webcam-capture/webcam-capture-examples/webcam-capture-javafx-service/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/sarxos/workspace/webcam-capture/webcam-capture-examples/webcam-capture-javafx-service/src/main/java/WebCamView.java:[25,95] lambda expressions are not supported in -source 1.5
  (use -source 8 or higher to enable lambda expressions)
[ERROR] /home/sarxos/workspace/webcam-capture/webcam-capture-examples/webcam-capture-javafx-service/src/main/java/FXCamTest.java:[34,41] lambda expressions are not supported in -source 1.5
  (use -source 8 or higher to enable lambda expressions)
[INFO] 2 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.299 s
[INFO] Finished at: 2017-03-16T09:27:57+01:00
[INFO] Final Memory: 12M/291M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.3:compile (default-compile) on project WebCamTest: Compilation failure: Compilation failure:
[ERROR] /home/sarxos/workspace/webcam-capture/webcam-capture-examples/webcam-capture-javafx-service/src/main/java/WebCamView.java:[25,95] lambda expressions are not supported in -source 1.5
[ERROR] (use -source 8 or higher to enable lambda expressions)
[ERROR] /home/sarxos/workspace/webcam-capture/webcam-capture-examples/webcam-capture-javafx-service/src/main/java/FXCamTest.java:[34,41] lambda expressions are not supported in -source 1.5
[ERROR] (use -source 8 or higher to enable lambda expressions)
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

sarxos added a commit that referenced this issue Mar 16, 2017
@sarxos
Webcam JavaFX Service and View example, refs #357
856c6c2
@sarxos
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sarxos commented Mar 16, 2017

@james-d, I included your code as a new example. Feel free to modify it whenever you need.

https://github.com/sarxos/webcam-capture/tree/master/webcam-capture-examples/webcam-capture-javafx-service

Thanks!

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5 participants
@sarxos @Greg767 @james-d @hanggrian @defranke