Java UnsatisfiedLinkError while native library is found - linux

Question

I have a Java applet which allows me to access local storage in remote server. It works fine under Windows(IE 7.0.5730.13, Java SE 1.6.0.05). According to Java Console it downloads the native library for Java Native Interface:
ClientInterface::downloadLib: downloaded C:\Documents and Settings\user\IBM\10.10.10.65\remotedrive3d.dll in 1 attempts.
Initializing RemoteDisk v2.2
..and I'm able to access local storage devices:
Under Linux using OpenJDK 1.8.0_121 and IcedTea-Web 1.6.2 it also downloads the native library:
ClientInterface::downloadLib: downloaded /root/IBM/10.10.10.65/libibmxrdisk.so.1.0.3 in 1 attempts.
However, it fails to run with an UnsatisfiedLinkError error-message:
Initializing RemoteDisk v2.2
OpenJDK 64-Bit Server VM warning: You have loaded library /root/IBM/10.10.10.65/libibmxrdisk.so.1.0.3 which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
java.lang.UnsatisfiedLinkError: VirtualDrive.PassThroughCommand.GetSupportedDevices()LVirtualDrive/SupportedDevices;
at VirtualDrive.PassThroughCommand.GetSupportedDevices(Native Method)
at com.ibm.asm.remotedisk.RemoteDisk.buildDriveList(Unknown Source)
at com.ibm.asm.remotedisk.RemoteDisk.start(Unknown Source)
at sun.applet.AppletPanel.run(AppletPanel.java:476)
at sun.applet.AppletViewerPanelAccess.run(AppletViewerPanelAccess.java:84)
at java.lang.Thread.run(Thread.java:745)
..and I'm not able to access local storage devices:
When I start the Firefox using strace -f, then I can clearly see that libibmxrdisk.so.1.0.3 file is accessed. For example:
[pid 6741] open("/root/IBM/10.10.10.65/libibmxrdisk.so.1.0.3", O_RDONLY|O_NONBLOCK) = 48
[pid 6741] read(48, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\334S\0\0004\0\0\0"..., 52) = 52
[pid 6741] close(48)
This /root/IBM/10.10.10.65/libibmxrdisk.so.1.0.3 seems to contain strings like GetSupportedDevices:
root#s:~/IBM/10.10.10.65# strings libibmxrdisk.so.1.0.3 | grep -i GetSupportedDevices
Java_VirtualDrive_PassThroughCommand_GetSupportedDevices
GetSupportedDevices
Java_VirtualDrive_PassThroughCommand_GetSupportedDevices
root#s:~/IBM/10.10.10.65#
Is the proprietary native library libibmxrdisk.so.1.0.3 for Linux operating system probably broken? Is it possible that it is not compatible with OpenJDK? How to debug this further?

Answer 1

This is issue for http://icedtea.classpath.org/bugzilla/enter_bug.cgi?product=IcedTea-Web not stack overflow. As ITW developer, I will need to help with debugging a bit.
From the trace is clear architecture mishmash. I would bet your windows are 32b, but linux is (for sure) 64b machine. For some reason, ITW is downloading 32b version of your RemoteDrive library. 32b library should work on 64b system, but you need also 32b depndencies (and most likely also 32b java). Do you have them all?
If above is completly true, then it is bug i ITW, or jdk itslef. But I'm betting for above.
So: try 32 jdk, try various 32b depndencies, if not working, then please submit bug to ITW
HtH
J.