Error converting PDF file unit test.

[Tom]

I'm getting the following error message when running my code from a Spring WebMvcTest. The code works correctly when called from my application, just not in the test. Code is:

    private byte[] createThumbnailImage(byte[] imageData, String imageFormat) throws ImageConversionException {

        ByteArrayOutputStream os = new ByteArrayOutputStream();

        try {
            InputStream is = new ByteArrayInputStream(imageData);

            IMOperation op = new IMOperation();
            op.addImage("-");
            op.thumbnail(THUMBNAIL_SIZE);

            if (imageFormat.equalsIgnoreCase(PDF_FILE_EXTENSION)) {
                op.background("white");
                op.alpha("remove");
                //create PNG image output for PDF files
                op.addImage(PNG_FILE_EXTENSION+":-");
            }
            else {
                op.addImage(imageFormat+":-");
            }

            Pipe pipeIn  = new Pipe(is,null);
            Pipe pipeOut = new Pipe(null,os);

            ConvertCmd convert = new ConvertCmd();
            convert.setInputProvider(pipeIn);
            convert.setOutputConsumer(pipeOut);
            convert.run(op);

        }
        catch (IOException | IM4JavaException | InterruptedException e) {

            if (e.getMessage().contains("Cannot run program \"convert\"")) {
                String message = "Imagemagick not found or not installed.";
                LOG.error(message);
                throw new ImageConversionException(message);
            }

            throw new ImageConversionException(e.getMessage());
        }

        return os.toByteArray();
    }

I can run the same test for an image file (.jpg) and it converts correctly, both in the test and when the application is running. When converting for a PDF the command passed to IM is:

- -thumbnail 255 -background white -alpha remove png:-

The command is the same both when running the application and when calling the same code from a unit test, but in the unit test I get the following exception thrown and error message:

CommandException: magick: no images found for operation-thumbnail' at CLI arg 2`

I have IM and Ghostscript installed locally. Could there be a problem with IM calling Ghostscript, or a Pipe wrapper problem from a unit test? Appreciate any help. Thanks,

Tom

[Bernhard Bablok]

I'm a bit confused by "CommandException: magick". This suggests a new version of IM where all commands like "convert" are symlinks to "magick". Could you please check this? You could try to replace the symlinks with hardlinks. The magick-command behaves differently depending on the name it is called with, but im4java already resolves to the real name while searching for the command so this information gets lost.

Bernhard