EXCEPTION_ACCESS_VIOLATION in Windows XP

[Oscar Valtueña]

Hello,

I'm Oscar, and I'm new to this group.

We're using usb4java in different windows system, but in Windows XP (using java 1.6), we've check that sometimes usb4java crashes with an "Exception access violation"... The following is part of the hs_err file generated by java in the crash:

#

# A fatal error has been detected by the Java Runtime Environment:

#

#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6b60b256, pid=832, tid=192

#

Stack: [0x2c4d0000,0x2c520000],  sp=0x2c51f390,  free space=316k

Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)

C  [libusb-1.0.dll+0xb256]  usbi_read+0x34fe

C  [libusb-1.0.dll+0xb69e]  usbi_read+0x3946

C  [libusb-1.0.dll+0xce3d]  usbi_read+0x50e5

C  [libusb-1.0.dll+0x16f0]  libusb_get_device_list+0x70

C  [libusb4java.dll+0x1599]  Java_de_ailis_usb4java_libusb_LibUsb_getDeviceList+0x60

j  de.ailis.usb4java.libusb.LibUsb.getDeviceList(Lde/ailis/usb4java/libusb/Context;Lde/ailis/usb4java/libusb/DeviceList;)I+0

j  de.ailis.usb4java.DeviceManager.updateDeviceList()V+21

j  de.ailis.usb4java.DeviceManager.scan(Ljavax/usb/UsbHub;)V+1

j  de.ailis.usb4java.DeviceManager.scan()V+5

j  de.ailis.usb4java.DeviceManager$1.run()V+22

j  java.lang.Thread.run()V+11

v  ~StubRoutines::call_stub

V  [jvm.dll+0x10e3bd]

V  [jvm.dll+0x1a5711]

V  [jvm.dll+0x10e571]

V  [jvm.dll+0x10e5cb]

V  [jvm.dll+0xc07e9]

V  [jvm.dll+0x12dce4]

V  [jvm.dll+0x155fac]

C  [msvcr71.dll+0x9565]  endthreadex+0xa0

C  [kernel32.dll+0xb713]  GetModuleFileNameA+0x1b4

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)

j  de.ailis.usb4java.libusb.LibUsb.getDeviceList(Lde/ailis/usb4java/libusb/Context;Lde/ailis/usb4java/libusb/DeviceList;)I+0

j  de.ailis.usb4java.DeviceManager.updateDeviceList()V+21

j  de.ailis.usb4java.DeviceManager.scan(Ljavax/usb/UsbHub;)V+1

j  de.ailis.usb4java.DeviceManager.scan()V+5

j  de.ailis.usb4java.DeviceManager$1.run()V+22

j  java.lang.Thread.run()V+11

v  ~StubRoutines::call_stub

Does anybody knows the solution of this problem?

Thanks and regards

Oscar .....................................................

[Prashanth Kumar]

I have been playing around with this jar files for a few days now. Have not managed to get it working to read from usb magnetic card reader.

Here are some of the things i did along the way based on information I found on the net

1. First check the properties file. Remove any extra line feed or trailing white space. There should be only one line in the file

2. Upgraded to latest jar files (SNAPSHOT)

3. Moved to high level api

Well it took away my EXCEPTION_ACCESS_VIOLATION but I am still struggling. Right now on windows( win 7 64 bit) I am getting USB error 7 Operation time out

and on Ubuntu I am getting USB error 6 : unable to claim interface: Resource busy

[Oscar Valtueña]

I've tested with the last 1.2.0-SNAPSHOT, and it seems to work well in Windows XP. (I haven't check it in other systems by the moment)