Java SE (Java Platform, Standard Edition)

Hello,
I'm working with an videoconference application (SIP Communicator) in a Java Web Start application. I've got to access to download the jnlpo file and the application run apparentely without any problem, but when I try to call a user I get a java error message "javaw.exe has encountered a problem a needs to close", and when I check this error I found the following issue:

AppName: javaw.exe AppVer: 6.0.140.8 ModName: jvm.dll
ModVer: 14.0.0.16 Offset: 000fee15

I think the problem come from capture device detection, but I'm not sure because the java error dont say anything about this. I guess that is a capture device detection problem because when I check the Java Console I see:

GRAVE: Failed to initially commit JMFRegistry. Ignoring err.
java.lang.SecurityException: commit: Permission denied
at com.sun.media.util.Registry.commit(Registry.java:251)
at net.java.sip.communicator.impl.media.device.JmfDeviceDetector.initialize(JmfDeviceDetector.java:107)
at net.java.sip.communicator.impl.media.device.JmfDeviceDetector.setupJMF(JmfDeviceDetector.java:364)
at net.java.sip.communicator.impl.media.device.JmfDeviceDetector.detectAndConfigureCaptureDevices(JmfDeviceDetector.java:412)
at net.java.sip.communicator.impl.media.device.DeviceConfiguration.initialize(DeviceConfiguration.java:125)
at net.java.sip.communicator.impl.media.MediaServiceImpl$DeviceConfigurationThread.run(MediaServiceImpl.java:408)
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Looking for Audio capturer
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: DirectSound Capture Supported = false
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Gibberish protocol implementation [STARTED].
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: SSH protocol implementation [STARTED].
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: JavaSound Capture Supported = true
Exception on commit = java.lang.SecurityException: commit: Permission denied
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: JavaSoundAuto: Committed ok
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Looking for video capture devices
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Stun server address(null)/port(null) not set (or invalid). Disabling STUN.
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Network Address Manager ...[ STARTED ]
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Network Address Manager Service ...[REGISTERED]
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Zeroconf protocol implementation [STARTED].
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: IRC protocol implementation [STARTED].
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Scanning for configured Audio Devices.
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Found JavaSound audio capture as an audio capture device.
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Scanning for configured Video Devices.
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Found HP Webcam [VGA] as an RGB Video Device.
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger info
INFO: Creating datasource for:javasound://44100
java.lang.RuntimeException: No permission to capture from applets
26-jun-2009 17:00:38 net.java.sip.communicator.util.Logger error
GRAVE: Could not create data source for javasound://44100
javax.media.NoDataSourceException: Error instantiating class: com.sun.media.protocol.javasound.DataSource : java.lang.RuntimeException: No permission to capture from applets
at javax.media.Manager.createDataSource(Manager.java:1012)
at net.java.sip.communicator.impl.media.MediaControl.createDataSource(MediaControl.java:558)
at net.java.sip.communicator.impl.media.MediaControl.initCaptureDevices(MediaControl.java:192)
at net.java.sip.communicator.impl.media.MediaControl.initialize(MediaControl.java:146)
at net.java.sip.communicator.impl.media.MediaServiceImpl$DeviceConfigurationThread.run(MediaServiceImpl.java:409)

I dont know what is happening, so I' appreciate any help from you
If you need more information dont heasitate to contact me

Thanks a lot
Regards
Pedro