FULL PRODUCT VERSION :
java version "1.7.0_04"
Java(TM) SE Runtime Environment (build 1.7.0_04-b21)
Java HotSpot(TM) 64-Bit Server VM (build 23.0-b21, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Mac OS X 10.7.3

EXTRA RELEVANT SYSTEM CONFIGURATION :
Single threaded command line app. Nothing special.

A DESCRIPTION OF THE PROBLEM :
On JDK 1.7, repeated usage of ImageIO.read(ImageInputStream) results in ???Too many open files??? exception.

Also of interest is the process contains about 10,000 POSIX Semaphores at the same time.

Attempting to close the ImageInputStream manually throws an exception that it is already closed.

JDK 1.6.0_31 does not have this issue.

More details: http://stackoverflow.com/q/10441276/43217

REGRESSION.  Last worked in version 6u31

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Repeatedly reading images via ImageIO.read(ImageInputStream) will result in exhaustion of the process's available open file descriptors.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The JavaDocs state that ImageIO.read(ImageInputStream) closes input stream unless null is returned:

http://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html#read(javax.imageio.stream.ImageInputStream)

ACTUAL -
FileNotFoundException: "Too many open files"

Over 10,000 POSIX Semaphores in the process:

COMMAND   PID USER   FD     TYPE DEVICE  SIZE/OFF     NODE NAME
                                      ...
java    36809  smm *235r  PSXSEM              0t0          kcms00008FC901624000
java    36809  smm *236r  PSXSEM              0t0          kcms00008FC901624000
java    36809  smm *237r  PSXSEM              0t0          kcms00008FC901624000
java    36809  smm *238r  PSXSEM              0t0          kcms00008FC901624000
java    36809  smm *239r  PSXSEM              0t0          kcms00008FC901624000

ERROR MESSAGES/STACK TRACES THAT OCCUR :
FileNotFoundException: "Too many open files"

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
// Repeatedly executing this code produces it for me.

BufferedImage image = null;
ImageInputStream stream = null;
try {
    stream = new FileImageInputStream(file);
    image = ImageIO.read(stream);

} catch (Exception ex) {
    log.error("Image could not be read: "+file.getPath());

} finally {
    // ImageIO closes input stream unless null is returned
    // http://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html#read(javax.imageio.stream.ImageInputStream)
    if (stream != null && image == null) {
        try {
            stream.close();
        } catch (IOException ex) {
            log.error("ERROR closing image input stream: "+ex.getMessage(), ex);
        }
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
// I expected the results to be the same as executing this code (which works fine):

BufferedImage image = null;
InputStream stream = null;
try {
    stream = new FileInputStream(file);
    image = ImageIO.read(stream);

} catch (Exception ex) {
    log.error("Image could not be read: "+file);

} finally {
    if (stream != null) {
        try {
            stream.close();
        } catch (IOException ex) {
            log.error("ERROR closing image input stream: "+ex.getMessage(), ex);
        }
    }
}