[Demonstration 1]

[Buggy Method]
public static void main(final String[] args) {
    // start ImageJ
    new ImageJ();
    // open the sample
    final ImagePlus image = IJ.openImage("http://imagej.net/images/clown.jpg");
    image.show();
    // run the plugin
    final Class<?> clazz = EnergyDispersionCalibrationPlugin.class;
    IJ.runPlugIn(clazz.getName(), "");
}

[Buggy Hunk]
final ImagePlus image = IJ.openImage("http://imagej.net/images/clown.jpg");

[Patch]
final ImagePlus image = IJ.openImage();

[Demonstration 2]

[Buggy Method]
@Override
public Long getLast() {
    Integer rows = query.getRows();
    if (rows == null)
        return null;
    Integer start = query.getStart();
    if (start == null)
        start = 1;
    else
        // was 0 based
        start += 1;
    return start == null ? rows.longValue() : (1 + rows.longValue() - start.longValue());
}

[Buggy Hunk]
if(rows==null)

[Patch]
if(rows==null || rows.intValue()==Integer.MAX_VALUE)

[Demonstration 3]

[Buggy Method]
public static ImagePlus loadFullFluoImgs(String fluoDir) {
    ImagePlus fluoImg = null;
    ImagePlus zprojectImg = null;
    ImageStack fieldStack = null;
    Calibration fluoImgCalib = null;
    String[] listAcqNames = new File(fluoDir).list();
    String pattern = "(\\d+)(_)(\\w+)";
    for (String acqName : listAcqNames) {
        if (Pattern.matches(pattern, acqName)) {
            fluoImg = IJ.openImage(acqName + "/MMStack.ome.tif");
            zprojectImg = ImgUtils.zProject(fluoImg);
            if (fluoImgCalib == null) {
                fluoImgCalib = fluoImg.getCalibration();
            }
            if (fieldStack == null) {
                fieldStack = new ImageStack(zprojectImg.getWidth(), zprojectImg.getHeight());
            }
            fieldStack.addSlice(acqName.split("_", -1)[1], zprojectImg.getStack().getProcessor(1).convertToFloatProcessor());
        }
    }
    ImagePlus fieldImg = new ImagePlus("merged", fieldStack);
    fieldImg.setCalibration(fluoImgCalib);
    return fieldImg;
}

[Buggy Hunk]
fluoImg = IJ.openImage(acqName + "/MMStack.ome.tif");

[Patch]
fluoImg = IJ.openImage(fluoDir + "/" + acqName + "/MMStack.ome.tif");