ADDITIONAL SYSTEM INFORMATION :
JDK : JDK1.7.0_79-b15(bug same in jdk1.7.0_80);
OS:Windows7 and linux2.6.32
A DESCRIPTION OF THE PROBLEM :
1.execute ImageIO.read(url) when the resource of url is not exist.
2.the number of "TCP close_wait" keeps growing
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1.execute ImageIO.read(url) like the following codes:
//Author:yuyicheng
// domain must exists,but file doesnot.
String vivofsUrl = "https://domain/wiwNWYCFW9ieGbWq/20181129/3a2adfde12cd328d81f965088890eeffff.jpg";
File file = null;
BufferedImage image = null;
try {
file = File.createTempFile("abc", "jpg");
URL url1 = new URL(vivofsUrl);
image = ImageIO.read(url1);
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (null != file) {
file.delete();
}
if (null != image) {
image.flush();
image = null;
// System.gc();
}
}
2.to execute many times for Obviousness!
Ofcourse,it will throw FileNotFoundException and "IIOException: Can't get input stream from URL!"),
3.check tcp status
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Close Connection correctly.
ACTUAL -
1.Tracking TCP flow������������many tcp "RST" message occured
2.print TCP Status:the number of "TCP close_wait" keeps growing
---------- BEGIN SOURCE ----------
public static void main(String[] args) throws InterruptedException {
ExecutorService ex = Executors.newFixedThreadPool(10);
for (int i = 0; i < 5000; i++) {
ex.execute(task());
}
}
/**
* @throws IOException
* @throws MalformedURLException
*/
private static Runnable task() {
return new Runnable() {
@Override
public void run() {
// Author:yuyicheng
// domain must exists,but file doesnot.
String vivofsUrl = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1543505646937&di=ec0e29a9994a9a96e044c85228d01d18&imgtype=0&src=http%3A%2F%2Fimages.nike.com%2Fis%2Fimage%2FDotCom%2FPDP_HERO_S%2FNIKE-TEXTURED-FOAM-ROLLER-NER123_644_A.jpg";
File file = null;
BufferedImage image = null;
try {
file = File.createTempFile("abc", "jpg");
URL url1 = new URL(vivofsUrl);
image = ImageIO.read(url1);
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (null != file) {
file.delete();
}
if (null != image) {
image.flush();
image = null;
}
}
}
};
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
do not use ImageIO.read(url) ������������use others instead!
FREQUENCY : always