Java and Tess4J - having problem with running an example

[Risto Puusepp]

Hi!
I am new in Java but decided to give a shot. I have to recognize some areas from image and extract text from that. I understand that Tesseract has those options (define searching area, using something like OnlyNumbers method and training option). I have tried Asprise but it seems that Tesseract is more accurate.

So far I did:
Downloaded and unpacked files from http://tess4j.sourceforge.net to my PC under C:\work\java\Tess4J. I took and example http://tess4j.sourceforge.net/codesample.html, modified a bit and got code:

package net.sourceforge.tess4j.example;
import java.io.File;
import net.sourceforge.tess4j.*;
public class TesseractExample {
    public static void main(String[] args) {
        File imageFile = new File("c:\\work\\java\\pngs\\test1.jpg");
        Tesseract instance = Tesseract.getInstance(); // JNA Interface Mapping
        //Tesseract1 instance = new Tesseract1(); // JNA Direct Mapping
        try {
            String result = instance.doOCR(imageFile);
            System.out.println(result);
        } catch (TesseractException e) {
            System.err.println(e.getMessage());
        }
    }
}

Files:

 Directory of C:\work\java\Tess4J\src\net\sourceforge\tess4j\example

17.12.2013  20:08    <DIR>          .
17.12.2013  20:08    <DIR>          ..
17.12.2013  20:06               197 tess1.bat
17.12.2013  20:08               191 tess11.bat
26.12.2013  16:47               920 TesseractExample.class
17.12.2013  19:44               622 TesseractExample.java
               4 File(s)          1 930 bytes
               2 Dir(s)  73 354 510 336 bytes free

C:\work\java\Tess4J\src\net\sourceforge\tess4j\example>

It compiles without errors:

C:\work\java\Tess4J\src\net\sourceforge\tess4j\example>javac -cp .;
..\..\..\..\..\lib\ghost4j-0.3.1.jar;
..\..\..\..\..\lib\jai_imageio.jar;
..\..\..\..\..\lib\jna.jar;
..\..\..\..\..\lib\junit-4.10.jar;
..\..\..\..\..\dist\tess4j.jar
 TesseractExample.java

But when I  am going to execute then:

C:\work\java\Tess4J\src\net\sourceforge\tess4j\example>java -cp .;
..\..\..\..\..\lib\ghost4j-0.3.1.jar;
..\..\..\..\..\lib\jai_imageio.jar;
..\..\..\..\..\lib\jna.jar;
..\..\..\..\..\lib\junit-4.10.jar;
..\..\..\..\..\dist\tess4j.jar
TesseractExample

Exception in thread "main" java.lang.NoClassDefFoundError: TesseractExample (wrong name: net/sourceforge/tess4j/example/TesseractExample)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

C:\work\java\Tess4J\src\net\sourceforge\tess4j\example>

Am I missing some files or is the structure of files not correct???

[Quan Nguyen]

You seem to have not specified the fully-qualified class name. You should cd to src and run:

java -cp .;...path-to-jars... net.sourceforge.tess4j.example.TesseractExample

If possible, use an IDE, such as NetBeans or Eclipse.