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2016/07/09

[PDFBox] No ImageWriter found for 'tif' format in WebSphere

Problem
As I try to convert PDF to TIF via PDFBox in WebSphere 8, I got the error message during the conversion process:
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[Line:198][org.apache.pdfbox.tools.imageio.ImageIOUtil.writeImage]No ImageWriter found for 'tif' format
[Line:206][org.apache.pdfbox.tools.imageio.ImageIOUtil.writeImage]Supported formats: BMP bmp jpg JPG wbmp jpeg png PNG JPEG WBMP GIF gif 


Lacking of jai-imageio-core jar file in your classpath must get this error message.
But I have add jai-imageio-core dependency in pom.xml.
Snippet of pom.xml looks like:
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<!-- for generating tif file -->
<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox-tools</artifactId>
    <version>2.0.0</version>
</dependency>

<dependency>
    <groupId>com.github.jai-imageio</groupId>
    <artifactId>jai-imageio-core</artifactId>
    <version>1.3.1</version>
</dependency>

Therefore, I try to print log to figure out the weird problem:
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 try {
     Enumeration<URL> urls = Thread.currentThread().getContextClassLoader()
             .getResources("META-INF/services/javax.imageio.spi.ImageWriterSpi");
     while (urls.hasMoreElements()) {
         log.info("[convertToTiff] url = " + urls.nextElement().toString());
     }
 
 } catch (IOException e1) {
     e1.printStackTrace();
     throw new RuntimeException(e1);
 }

 The jar file exists in my ear file ! What happened?
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 [convertToTiff] url = wsjar:file:/usr/IBM/WebSphere/AppServer/profiles/AppSrv03/installedApps/FDCSRA205Node03Cell/yuantalife-ecp-manage.ear/yuantalife-ecp-manage-war-0.1.0-SNAPSHOT.war/WEB-INF/lib/jai-imageio-core-1.3.1.jar!/META-INF/services/javax.imageio.spi.ImageWriterSpi

Here is my source code:
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package albert.practice.file;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

import javax.imageio.ImageIO;

import lombok.extern.slf4j.Slf4j;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;

@Slf4j
public class PdfFileToTif {

    private final float dpi = 300f;

    public static void main(String[] args) {
        File pdfFile = new File("D:\\dropbox\\Getting Started.pdf");
        String destination = "D:\\dropbox\\";

        PdfFileToTif test = new PdfFileToTif();
        test.checkImageIoJarFile();
        test.convertPdfToTif(pdfFile, destination);
    }

    public void convertPdfToTif(File pdfFile, String destination) {
        if (!isFileExisted(pdfFile)) {
            throw new RuntimeException("File not found ! (" + pdfFile.getAbsolutePath() + ")");
        }

        String pdfFileName = pdfFile.getName();

        try {
            // load PDF document
            PDDocument document = PDDocument.load(pdfFile);

            // create PDF renderer
            PDFRenderer renderer = new PDFRenderer(document);

            // go through each page of PDF, and generate TIF for each PDF page.
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                // Returns the given page as an RGB image with 300 DPI.
                BufferedImage image = renderer.renderImageWithDPI(i, dpi, ImageType.BINARY);

                // Assign the file name of TIF
                String fileName = pdfFileName + "_" + String.format("%02d", i + 1);
                log.debug("Generating  " + fileName + ".tif to " + destination);

                // Writes a buffered image to a file using the given image format.
                ImageIOUtil.writeImage(image, destination + fileName + ".tif", Math.round(dpi));
                image.flush();
            }
            log.debug("PDF to TIF conversion well done!");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 判斷檔案是否存在
     * 
     * @param file
     * @return true - 檔案存在; false - 檔案不存在
     */
    private Boolean isFileExisted(File file) {
        Boolean isExisted = Boolean.FALSE;
        isExisted = (file.exists() && (!file.isDirectory()));
        return isExisted;
    }

    private void checkImageIoJarFile() {
        try {
            Enumeration<URL> urls = Thread.currentThread().getContextClassLoader()
                    .getResources("META-INF/services/javax.imageio.spi.ImageWriterSpi");
            while (urls.hasMoreElements()) {
                log.info("[convertToTiff] urls = " + urls.nextElement().toString());
            }

        } catch (IOException e1) {
            e1.printStackTrace();
            throw new RuntimeException(e1);
        }
    }
}


How-to
The root cause is not so clear. It may results from WebSphere's classloading problem.
Hence, I find an API to scans for plug-ins on the application class path, loads their service provider classes, and registers a service provider instance for each one found with the IIORegistry. This strange problem had been resolved as I add ImageIO.scanForPlugins();

Here is my updated source code (Line46):
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package albert.practice.file;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

import javax.imageio.ImageIO;

import lombok.extern.slf4j.Slf4j;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;

@Slf4j
public class PdfFileToTif {

    private final float dpi = 300f;

    public static void main(String[] args) {
        File pdfFile = new File("D:\\dropbox\\Getting Started.pdf");
        String destination = "D:\\dropbox\\";

        PdfFileToTif test = new PdfFileToTif();
        test.checkImageIoJarFile();
        test.convertPdfToTif(pdfFile, destination);
    }

    public void convertPdfToTif(File pdfFile, String destination) {
        if (!isFileExisted(pdfFile)) {
            throw new RuntimeException("File not found ! (" + pdfFile.getAbsolutePath() + ")");
        }

        String pdfFileName = pdfFile.getName();

        try {
            // load PDF document
            PDDocument document = PDDocument.load(pdfFile);

            // Scans for plug-ins on the application class path, loads their service provider
            // classes, and registers a service provider instance for each one found with the
            // IIORegistry.
            ImageIO.scanForPlugins();

            // create PDF renderer
            PDFRenderer renderer = new PDFRenderer(document);

            // go through each page of PDF, and generate TIF for each PDF page.
            for (int i = 0; i < document.getNumberOfPages(); i++) {
                // Returns the given page as an RGB image with 300 DPI.
                BufferedImage image = renderer.renderImageWithDPI(i, dpi, ImageType.BINARY);

                // Assign the file name of TIF
                String fileName = pdfFileName + "_" + String.format("%02d", i + 1);
                log.debug("Generating  " + fileName + ".tif to " + destination);

                // Writes a buffered image to a file using the given image format.
                ImageIOUtil.writeImage(image, destination + fileName + ".tif", Math.round(dpi));
                image.flush();
            }
            log.debug("PDF to TIF conversion well done!");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 判斷檔案是否存在
     * 
     * @param file
     * @return true - 檔案存在; false - 檔案不存在
     */
    private Boolean isFileExisted(File file) {
        Boolean isExisted = Boolean.FALSE;
        isExisted = (file.exists() && (!file.isDirectory()));
        return isExisted;
    }

    private void checkImageIoJarFile() {
        try {
            Enumeration<URL> urls = Thread.currentThread().getContextClassLoader()
                    .getResources("META-INF/services/javax.imageio.spi.ImageWriterSpi");
            while (urls.hasMoreElements()) {
                log.info("[convertToTiff] urls = " + urls.nextElement().toString());
            }

        } catch (IOException e1) {
            e1.printStackTrace();
            throw new RuntimeException(e1);
        }
    }
}




Reference 
[1] http://stackoverflow.com/questions/17178591/how-to-add-tiff-imagereader-to-those-registered-in-grails

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