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https://issues.apache.org/jira/browse/PDFBOX-3236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15152328#comment-15152328
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Ilya Scherbakov commented on PDFBOX-3236:
-----------------------------------------

I have still problem with heap memory. Changing of value of heap have no any 
effect. I still continue get error after 16th page of document.

I changed my code, but it also doesn't work.

function convertPDFToImagesDOLBO(pdfPath, folderForImagesPath)
{
    // WARNING!!! This function must be used for creating etalon images (during 
developing new tests)
        
    if (!aqFile.Exists(pdfPath))
    {
        Log.Error("ERROR: Unable to find file \"" + pdfPath + "\" on disk.");
    }
    
    var pdfRenderer;
    var docObj;
    var f;
    var pageObj;
    var fileToWrite;
    var numberOfPages;
    var outputStream;
    
    
    numberOfPages = getNumberOfPDFPages(pdfPath); 
    for (var i = 1; i < 104; i++) //numberOfPages
    {    
        // Opening PDF
        f = JavaClasses.java_io.File.newInstance(pdfPath);
        docObj = JavaClasses.org_apache_pdfbox_pdmodel.PDDocument.load_2(f);
        pdfRenderer = 
JavaClasses.org_apache_pdfbox_rendering.PDFRenderer.newInstance(docObj);   
        
    
            
        // Get the desired page
        pageObj = getPage(docObj, i);
        fileName = folderForImagesPath + "\\etalon_page_" + (i + 1) + ".png";
        fileToWrite = JavaClasses.java_io.File.newInstance(fileName);
        outputStream = 
JavaClasses.javax_imageio.ImageIO.createImageOutputStream(fileToWrite);
        
JavaClasses.javax_imageio.ImageIO.write_3(pdfRenderer.renderImageWithDPI_2(i, 
300.0), "png", outputStream);
        
        outputStream.close();
        docObj.close();   // Closing PDF Document                 
    }
    
    Log.Message("Converting of file \"" + pdfPath + "\" was finished 
successfully. See files like etalon_page_NNN.png in the folder \"" + 
folderForImagesPath + "\".");
}

> Out Of Memory exception during converting PDF to PNG
> ----------------------------------------------------
>
>                 Key: PDFBOX-3236
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3236
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.0
>            Reporter: Ilya Scherbakov
>            Priority: Critical
>         Attachments: huk.pdf
>
>
> I use PDFBox 2.0.0 RC3 from TestComplete 10.60. My task is converting of 
> multi-page PDF to PNG images. During code execution on the 18th page I 
> receive error: java:lang.OutOfMemoryError: Java heap space.
> Error appeared in the string:
> {code}
> JavaClasses.javax_imageio.ImageIO.write_3(pdfRenderer.renderImageWithDPI_2(i, 
> 300.0), "png", outputStream);   // error
> {code}
> My code is the following:
> {code}
> function convertPDFToImages(pdfPath, folderForImagesPath)
> {
>     // Opening PDF
>     f = JavaClasses.java_io.File.newInstance(pdfPath);
>     docObj = JavaClasses.org_apache_pdfbox_pdmodel.PDDocument.load_2(f);
>     var pdfRenderer = 
> JavaClasses.org_apache_pdfbox_rendering.PDFRenderer.newInstance(docObj);
>     
>     var pageObj;
>     var fileToWrite;
>     var numberOfPages = getNumberOfPDFPages(pdfPath);
>     var outputStream;
>         
>     for (var i = 1; i < numberOfPages; i++)
>     {        
>         // Get the desired page
>         pageObj = getPage(docObj, i);
>         fileName = folderForImagesPath + "\\etalon_page_" + (i + 1) + ".png";
>         fileToWrite = JavaClasses.java_io.File.newInstance(fileName);
>         outputStream = 
> JavaClasses.javax_imageio.ImageIO.createImageOutputStream(fileToWrite);
>         
> JavaClasses.javax_imageio.ImageIO.write_3(pdfRenderer.renderImageWithDPI_2(i, 
> 300.0), "png", outputStream);   // error
>         outputStream.close();
>     
>                     
>     }
>     docObj.close();   // Closing PDF Document
>     Log.Message("Converting of file \"" + pdfPath + "\" was finished 
> successfully. See files like etalon_page_NNN.png in the folder \"" + 
> folderForImagesPath + "\".");
> }
> {code}



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