A DESCRIPTION OF THE PROBLEM :
com.sun.imageio.plugins.jpeg.JPEGImageReader.getImageTypes(-1) without input source returns an empty iterator instead of throwing an exception
IllegalStateException – if the input source has not been set.
IndexOutOfBoundsException – if the supplied index is out of bounds.
IOException – if an error occurs reading the format information from the input source.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
catch Exception
ACTUAL -
class com.sun.imageio.plugins.jpeg.JPEGImageReader
false

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import java.io.IOException;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;

public class JpegReaderTest {

    public static void main(String[] args) {
        Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("jpeg");
        if (!readers.hasNext()) {
            throw new RuntimeException("No jpeg image readers found");
        }

        ImageReader ir = readers.next();
        System.out.println(ir.getClass());
        try {
            Iterator types = ir.getImageTypes(-1);
            System.out.println(types.hasNext());
        } catch (IOException | IndexOutOfBoundsException | IllegalStateException e) {
            System.out.println(e.getMessage()); // expectied
        }
    }
}

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