Description of problem:
com.arsdigita.mimetypes.image.ImageSizer(String path) :

public Dimension computeImageSize(String path) throws IOException 
{
        DataInputStream in = null;
        Dimension size = null;
        try {
            in = new DataInputStream(new FileInputStream(path));
            size = computeSize(in);
        } catch (IOException e) {
            throw e;
        } finally {
            in.close();
        }
        return size;
    }

In finally, in must be checked it is not null before closing it.
line 64 :
     in.close();
should must replaced by :
     if (in != null) in.close();

Version-Release number of selected component (if applicable):


How reproducible:
always

Steps to Reproduce:
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Actual results:


Expected results:


Additional info: