THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Imagine you have a servlet which dynamically generates images and serves them via the Java javax.imageio.ImageIO. To write the image to the OutputStream, perhaps you are doing something like this:
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BufferedImage img = createMyImage(); // makes a BufferedImage
response.setContentType("image/png");
try {
try (OutputStream out = response.getOutputStream()) { // try-with-resources
ImageIO.write(img, "PNG", out);
}
} catch (IOException ex) {
// Client abandonedaborted connection
}
}
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Now, although there shouldn't be any Exception logged (because the IOException which occurs when the client abandoned aborted the connection is ignored), you see strange Exceptions in Tomcat's log which may belong to other Servlets/JSP (at least with Sun/Oracle JVM on Windows), saying that the response has already commited, althought you didn't write anything to it at that time. For example:
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response.setContentType("image/png");
try {
try (OutputStream out = new MyImageIOOutputStream(response.getOutputStream())) {
ImageIO.write(img, "PNG", out);
}
} catch (IOException ex) {
// Client abandonedaborted connection
}
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and the errors should be gone away.
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