JAVA Tess4j doOCR() не работаю, Exception "Invalid доступ к памяти"

Question

Im, работающих в динамическом веб-проекта в Eclipse, я сделал класс TesseractOCR, которые содержат:

public class TesseractOCR { 

    public TesseractOCR() 
    { 
    } 

    public String doOCR(String file) 
    { 
     System.setProperty("jna.library.path", "32".equals(System.getProperty("sun.arch.data.model")) ? "lib/win32-x86" : "lib/win32-x86-64"); 

      File imageFile = new File("C:\\Users\\Sherein Dabbah\\Downloads\\ca096-d7a6d799d7a1d798d799d7a72.jpg"); 
      Tesseract instance = Tesseract.getInstance(); // JNA Interface Mapping 
      Tesseract1 instance1 = new Tesseract1(); 
      instance.setLanguage("heb+eng"); 
      // Tesseract1 instance = new Tesseract1(); // JNA Direct Mapping 
      // File tessDataFolder = LoadLibs.extractTessResources("tessdata"); // Maven build bundles English data 
      // instance.setDatapath(tessDataFolder.getAbsolutePath()); 
      String sub =""; 
      try { 
       String result = instance.doOCR(imageFile); 
       int indx1 = 6+result.indexOf("אבחנות"); 
       int indx2 = result.indexOf("הפניות"); 
       sub = result.substring(indx1,indx2-1); 
       System.out.println(sub); 
      } catch (Exception e) { 
       System.err.println(e.getMessage()); 
      } 

      return sub; 

    } 
} 

пока есть сервлет, который содержит функцию doPost()

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 

     System.setProperty("jna.library.path", "32".equals(System.getProperty("sun.arch.data.model")) ? "lib/win32-x86" : "lib/win32-x86-64"); 

     response.setContentType("text/html;charset=UTF-8"); 

      // Create path components to save the file 
      final String path = "C:\\Users\\Sherein Dabbah\\Desktop\\med"; //request.getParameter("destination"); 
      final Part filePart = request.getPart("file"); 
      final String fileName = filePart.getSubmittedFileName(); 

      OutputStream out = null; 
      InputStream filecontent = null; 
      PrintWriter writer = response.getWriter(); 

      if(fileName == ""){ 
       writer.println("You either did not specify a file to upload or are " 
         + "trying to upload a file to a protected or nonexistent " 
         + "location."); 
       return; 
      } 

      String fullName = path + File.separator+ fileName; 

      try { 
       File newFile = new File(fullName); 
       out = new FileOutputStream(newFile); 
       filecontent = filePart.getInputStream(); 

       int read = 0; 
       final byte[] bytes = new byte[1024]; 

       while ((read = filecontent.read(bytes)) != -1) { 
        out.write(bytes, 0, read); 
       } 

       writer.println("New file " + fileName + " created at " + path); 
       LOGGER.log(Level.INFO, "File{0}being uploaded to {1}", 
         new Object[]{fileName, path}); 

      } catch (FileNotFoundException fne) { 
       writer.println("You either did not specify a file to upload or are " 
         + "trying to upload a file to a protected or nonexistent " 
         + "location."); 
       writer.println("<br/> ERROR: " + fne.getMessage()); 

       LOGGER.log(Level.SEVERE, "Problems during file upload. Error: {0}", 
         new Object[]{fne.getMessage()}); 
      } finally { 
       if (out != null) { 
        out.close(); 
       } 
       if (filecontent != null) { 
        filecontent.close(); 
       } 
       if (writer != null) { 
        writer.close(); 
       } 
      } 

      String s = new TesseractOCR().doOCR(fullName); 
      System.out.println(s); 
     } 

у меня есть исключение:

Sep 06, 2015 10:36:46 AM org.apache.catalina.core.StandardWrapperValve invoke 
    SEVERE: Servlet.service() for servlet [servlets.UploadServlet] in context with path [/up] threw exception [Servlet execution threw an exception] with root  cause 
    java.lang.Error: Invalid memory access 
    at com.sun.jna.Native.invokePointer(Native Method) 
    at com.sun.jna.Function.invokePointer(Function.java:470) 
    at com.sun.jna.Function.invoke(Function.java:404) 
    at com.sun.jna.Function.invoke(Function.java:315) 
    at com.sun.jna.Library$Handler.invoke(Library.java:212) 
    at com.sun.proxy.$Proxy4.TessBaseAPIGetUTF8Text(Unknown Source) 
    at net.sourceforge.tess4j.Tesseract.getOCRText(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 classes.TesseractOCR.doOCR(TesseractOCR.java:28) 
    at servlets.UploadServlet.doPost(UploadServlet.java:111) 
    at... 

Он не работает в строке: Строковый результат = экземпляр.doOCR (imageFile); в TesseractOCR class

Answer 1

Возможно, вам потребуется позвонить setDatapath, чтобы сообщить, где найти папку tessdata для файлов .traineddata.

Кроме того, вам больше не нужно устанавливать переменную jna.library.path, поскольку tess4j теперь может автоматически извлекать и загружать собственные библиотеки.