When refresh applet page webcam is not loading?

[shamaks]

Hi
i used webcam-capture jar in my applet code to capture photo. when i run my applet code on web at first time it works, if i click refresh the page will get refresh and again if i click capture photo it is not working. please help me regarding this. i'm waiting for u r replay.
the below are the list of webcam-capture jar i tried.

webcam-capture-0.3.10-RC6-dist.jar
webcam-capture-0.3.10-20140310.191743-24.jar
webcam-capture-0.3.10-RC6.jar

when i click refresh it throws below error.

basic: Removed progress listener: sun.plugin.util.ProgressMonitorAdapter@c115
basic: PluginMain.unregisterApplet: 9 from mananger sun.plugin2.applet.Applet2Manager@1a11f21
Exception in thread atomic-processor-1
Exception in thread webcam-updater-thread-1
java.lang.IllegalMonitorStateException
    at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(Unknown Source)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(Unknown Source)
    at java.util.concurrent.locks.ReentrantLock.unlock(Unknown Source)
    at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
java.lang.IllegalMonitorStateException
    at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(Unknown Source)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(Unknown Source)
    at java.util.concurrent.locks.ReentrantLock.unlock(Unknown Source)
    at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

[sarxos]

Hi @shamaks,

Handling webcam in applet is really tricky - I found that it behaves in a completely different way if you compare it with the classic or webstart app (different lifecycle vs dependency on natives and hardware, especially problematic on Windows).

The problem you are facing is caused by the fact that JVM is restarting the applet before the close operation is completed. I suppose that solution in your case is to add:

<param name="separate_jvm" value="true" />

In the applet HTML element (see here).

Here you can find the most recent code for the webcam capture applet:

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

Please note that it is not a reference implementation and everyone are welcome to change it if bug is found or if some nice enhancement can be done.

[shamaks]

Thanks, It's working now.

[sarxos]

Cool. I'm closing the ticket in such a case.