javax.imageio.IIOException: I/O error writing PNG file

Question

I am using Jpedal tool to convert PDF to Image. When PDF pages are very large in number and we process it to convert then tomcat gets stopped and throws Exception-

  javax.imageio.IIOException: I/O error writing PNG file.

Can anyone please help for this.

public boolean createPDF2ImageTask(String sourcePDFAbsPath, String destinationImageAbsPath, Float scalingFactor, String fileFormat, int softLimitInKB) throws Exception
    { 

        System.setProperty("org.jpedal.flattenForm","true");
        logger.info("createPDF2ImageTask ( sourcePDFAbsPath = "+sourcePDFAbsPath+" , destinationImageAbsPath = "+destinationImageAbsPath+ ", scalingFactor = "+scalingFactor+ " , fileFormat = "+fileFormat+ " softLimitInKB ="+softLimitInKB );
        boolean status = true;
        Float newScalingFactor;
        int sizeOfImageInKB;

        //PdfDecoder object provides the conversion 

        PdfDecoderServer decoder = null;
        Map mapValues = null;
        BufferedImage imageToSave = null;
        BufferedOutputStream bufferedOutputStream = null;
        long startTime = System.currentTimeMillis();
        try
        {

            Helper.deleteFile(destinationImageAbsPath);

            //mappings for non-embedded fonts to use
            FontMappings.setFontReplacements();

            decoder = new PdfDecoderServer(true);
            decoder.openPdfFile(sourcePDFAbsPath);


            mapValues = new HashMap();


            mapValues.put(JPedalSettings.EXTRACT_AT_BEST_QUALITY_MAXSCALING, 2);

            //alternatively secify a page size (aspect ratio preserved so will do best fit)
            //set a page size (JPedal will put best fit to this)
            PdfPageData pageData = decoder.getPdfPageData();
            int width = (int)(scalingFactor*pageData.getCropBoxWidth(1));
            int height = (int)(scalingFactor*pageData.getCropBoxHeight(1));
            logger.info("width = "+ width + "   height= "+height);          
            mapValues.put(JPedalSettings.EXTRACT_AT_PAGE_SIZE, new String[]{String.valueOf(width),String.valueOf(height)});

            //which takes priority (default is false)
            mapValues.put(JPedalSettings.PAGE_SIZE_OVERRIDES_IMAGE, Boolean.TRUE);

            PdfDecoderServer.modifyJPedalParameters(mapValues);                              

            /////////////////////////////////////////////////////////////////////////////////////

            try
            {
                imageToSave = decoder.getPageAsHiRes(1, null, false);
                decoder.flushObjectValues(true);
                if(imageToSave != null)
                {
                    logger.info("Start saving image as a file");
                    bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(new File(destinationImageAbsPath)));

                    ImageIO.write(imageToSave, fileFormat, bufferedOutputStream);

                }
                else
                {
                    throw new Exception("imageToSave is null, Exception in extractPageAsImage ");
                }
            }
            catch(Exception e)
            {
                logger.error("Exception in extractPageAsImage :: "+e);
                logger.error("Exception stack trace in extractPageAsImage :: ",e);
                throw new Exception("Exception in extractPageAsImage :: "+e);
            }

It's throwing Exception - Exception in extractPageAsImage :: javax.imageio.IIOException: I/O error writing PNG file!

Answer 1

Maybe you could try to solve this by increasing memory of your Tomcat instance. On Unix platforms this can be achieved by adding some Java options in setenv.sh:

export JAVA_OPTS="$JAVA_OPTS -Xms128m -Xmx2048m -XX:MaxPermSize=512m"

or on Windows in the file setenv.bat:

set "JAVA_OPTS=%JAVA_OPTS% -Xms128m -Xmx2048m -XX:MaxPermSize=512m" 

Please note that the numbers in the examples above are just examples, as they depend on the memory available on your platform.

Please refer to Tomcat's RUNNING.txt for further details on how to configure the Tomcat on your platform.