Tess4j : java.lang.UnsatisfiedLinkError: Unable to load library

Question

Im using tess4j.jar in my Eclipse project. When i run it on eclipse my project is working fine, but when i try to run the exported runnable .jar file it always fails due to "java.lang.UnsatisfiedLinkError: Unable to load library 'libtesseract302'" error.

I tried to fix it with solutions from similar posts but nothing worked.

1. Located the 'libtesseract302' and 'liblept168.dll' file into a "dll" folder an added it as source folder.
2. I´m running java 32bit and confirmed that the dlls are also 32bit dlls.

Error log:

Exception in thread "Thread-2" java.lang.UnsatisfiedLinkError: Unable to load library 'libtesseract302': Can't obtain InputStream for win32-x86/libtesseract302.dll
    at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:271)
    at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:398)
    at com.sun.jna.Library$Handler.<init>(Library.java:147)
    at com.sun.jna.Native.loadLibrary(Native.java:412)
    at com.sun.jna.Native.loadLibrary(Native.java:391)
    at net.sourceforge.tess4j.TessAPI.<clinit>(Unknown Source)
    at net.sourceforge.tess4j.Tesseract.init(Unknown Source)
    at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
    at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
    at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
    at brain.Main.startOCR(Main.java:292)
    at brain.Main.getOcrResult(Main.java:251)

Answer 1

If the DLLs are packaged in the JAR file, they will need to be extracted. Then set jna.library.path system property to the location of the DLL files (see Tutorial).