Boilerplate for Tess4J v4. Code snippet demo for step 1.

Test.java

import java.io.File;
import java.nio.file.Path;
import java.nio.file.Paths;
import net.sourceforge.tess4j.Tesseract;

public class Test {
    public static void main(String[] args) {
        Tesseract instance = new Tesseract();
        int imageDPI = 300;
        Path currentRelativePath = Paths.get("");
        String s = currentRelativePath.toAbsolutePath().toString();
        File dataDir = new File(s, "tessdata");

        if(dataDir.exists()) {
            instance.setDatapath(dataDir.getAbsolutePath());
            /* START TO DO LOGIC HERE*/
            instance.setLanguage("eng+osd+equ");
            /*
            OCR engine modes (oem)
            0. Legacy engine only
            1. Neural nets LSTM engine only
            2. Legacy + LSTM engines
            3. Default, based on what is available
            */
            instance.setOcrEngineMode(1);
            instance.setTessVariable("user_defined_dpi", imageDPI+"");
            
            


            /* //END TO DO LOGIC HERE*/
            // String text = instance.doOCR(new File("bday_card.jpg"));
            // System.out.print(text);
        }      
    }
}