Getting UnsatisfiedLinkError: no jnilept in java.library.path when I create TessBaseAPI

Question

I am new to java cpp and tesseract-ocr. I am stuck with one issue from couple of hours. I am getting UnsatisfiedLinkError: no jnilept in java.library.path when I cre

Answer 1

you could clone or download the project:

https://github.com/bytedeco/javacpp-presets#the-cppbuildsh-scripts

then build the modules: JavaCPP Presets for Tesseract and JavaCPP Presets for Leptonica;

(to build the leptonica project you maybe need to install nasm https://www.nasm.us/)

(to build the entire javacpp-presets project you also have to install cmake)

that would create the native libraries:

libjnilept.so and libjnitesseract.so

then you have to specify the jni.library.path

You can do it with:

System.setProperty(JAVA_LIBRARY_PATH, tmpDirName);
/* Optionally add these two lines */
System.setProperty("jna.library.path", tmpDirName);
System.setProperty("jni.library.path", tmpDirName);
final Field fieldSysPath;

fieldSysPath = ClassLoader.class.getDeclaredField(SYS_PATHS);

fieldSysPath.setAccessible(true);
fieldSysPath.set(null, null);

(you could instead specify the -Djava.library.path= on the virtual machine options)

you only have to put the generated files: libjnilept.so and libjnitesseract.so in some folder and set this path for: jni.library.path

    org.bytedeco.javacpp-presets
    tesseract           
    4.0.0-1.4.4            



    org.bytedeco.javacpp-presets
    leptonica
    1.77.0-1.4.4 

you can also try to add

    
    org.bytedeco.javacpp-presets
    leptonica-platform 
    1.77.0-1.4.4
 


    org.bytedeco.javacpp-presets
    tesseract-platform
    4.0.0-1.4.4

and add into the build a maven-assembly-plugin

        
            maven-assembly-plugin
            
                
                    
                         mainClass>fully.qualified.MainClass
                    
                
                
                    jar-with-dependencies
                
            
            
            
                
                    make-assembly 
                    package 
                    
                        single 
                    
                
            
           

 

---

 

Also, you could also get an error like this:

sscanf(line, "%" QUOTED_TOKENSIZE "s %" QUOTED_TOKENSIZE "s %f %f",
linear_token, essential_token, &ParamDesc[i].Min, &ParamDesc[i].Max) == 4
:Error:Assert failed:in file clusttool.cpp, line 73
#
# A fatal error has been detected by the Java Runtime Environment:

Due to Tesseract's locale requirements, export LC_ALL=C is required before running any client programs.

so:

       
            org.codehaus.mojo
            exec-maven-plugin
            1.6.0
            
                
                    
                        exec
                    
                
            
             
                  
                    C
                
                java
                
                    -classpath
                    
                    ${classpath}
                
            
         

source:
    - https://github.com/nguyenq/tess4j/issues/106
    - https://github.com/sirfz/tesserocr/issues/165