Could not find library [libjsane.so]

[brucewoo]

JarLib.load
Error = java.lang.UnsatisfiedLinkError: uk.co.mmscomputing.util.JarLib.loadX: Could not find library [libjsane.so]
JarLib.load
Error = java.lang.UnsatisfiedLinkError: uk.co.mmscomputing.util.JarLib.loadX: Could not find library [libjsane.so]
java.lang.UnsatisfiedLinkError: uk.co.mmscomputing.util.JarLib.loadX: Could not find library [libjsane.so]
at uk.co.mmscomputing.util.JarLib.loadX(JarLib.java:40)
at uk.co.mmscomputing.util.JarLib.load(JarLib.java:10)
at uk.co.mmscomputing.device.sane.jsane.(jsane.java:140)
at uk.co.mmscomputing.device.sane.SaneScanner.isAPIInstalled(SaneScanner.java:17)
at uk.co.mmscomputing.device.scanner.Scanner.getDevice(Scanner.java:86)
at net.sourceforge.vietocr.GuiWithScan$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at org.GNOME.Accessibility.AtkWrapper$5.dispatchEvent(AtkWrapper.java:700)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
JarLib.load
Error = java.lang.UnsatisfiedLinkError: no jsane in java.library.path
JarLib.load
Error = java.lang.UnsatisfiedLinkError: no jsane in java.library.path
java.lang.UnsatisfiedLinkError: no jsane in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1122)
at uk.co.mmscomputing.util.JarLib.load(JarLib.java:22)
at uk.co.mmscomputing.device.sane.jsane.(jsane.java:140)
at uk.co.mmscomputing.device.sane.SaneScanner.isAPIInstalled(SaneScanner.java:17)
at uk.co.mmscomputing.device.scanner.Scanner.getDevice(Scanner.java:86)
at net.sourceforge.vietocr.GuiWithScan$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at org.GNOME.Accessibility.AtkWrapper$5.dispatchEvent(AtkWrapper.java:700)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
00:13:02.931 [AWT-EventQueue-1] ERROR net.sourceforge.vietocr.GuiWithScan - null
java.lang.NullPointerException: null
at net.sourceforge.vietocr.GuiWithScan$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at org.GNOME.Accessibility.AtkWrapper$5.dispatchEvent(AtkWrapper.java:700)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[nguyenq]

The doc states: "On Linux, scanning requires installation of SANE packages." Have you installed it?

[nguyenq]

It was recently discovered that the jsane library, the java wrapper to the SANE functions, only works with Linux 32-bit. Running it on Linux 64-bit will throw UnsatisfiedLinkError exceptions. It looks like a libjsane.so has to be compiled for 64-bit.

Background: http://imagej.1557.x6.nabble.com/Scan-does-not-scan-td3685074.html
Source: http://thorntonzone.com/manuals/Compression/Fax,%20IBM%20MMR/MMSC/mmsc/uk/co/mmscomputing/device/sane/index.html

[nguyenq]

We can recompile the library on Linux Ubuntu 64-bit, but it looks like some change to the source code is necessary as UnsatisfiedLinkError exceptions still happen. Need JNI expert help!

[ekuester]

In my opinion you should leave out the scan option in the GUI. The uk.co.mmscomputing.device.sane.jar is too old for modern java ...
Nevertheless I gave it a try:
As outlined you need lin64 code. I fetched it from
ttps://github.com/julian554/jscan/tree/master/src/main/java/uk/co/mmscomputing/device/sane/lin64,
corrected the location of some include files and replaced libsane.so in jsane.cpp by libsane.so.1. Now build lib with
g++ -Wall -fPIC -fpermissive -pthread -D_REENTRANT -D_GNU_SOURCE -shared -o libjsane.so jsane.cpp jdesc.cpp jnu.cpp and get 64-bit libjsane.so . I copied this into /usr/lib so that it can be found by the program. Starting the JAR the above error messages are gone BUT I get a fatal error detected by the Java Runtime Environment ( SIGSEGV fault ). Here I gave up.