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  1. JDK
  2. JDK-4335416

ImageIcon.loadImage() is hanging.

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 1.3.0, 1.3.1
    • Fix Version/s: None
    • Component/s: client-libs
    • Labels:
    • Subcomponent:
      2d
    • CPU:
      x86, sparc
    • OS:
      solaris_8, windows_nt

      Description



      Name: stC104175 Date: 05/03/2000


      java version "1.3.0rc2"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0rc2-Y)
      Java HotSpot(TM) Client VM (build 1.3.0rc2-Y, mixed mode)

      ImageIcon.loadImage() is hanging intermittently. Here is the jdk 1.3 source for
      the method.


          protected void loadImage(Image image) {
      synchronized(tracker) {
      tracker.addImage(image, 0);
      try {
      tracker.waitForID(0, 0);
      } catch (InterruptedException e) {
      System.out.println("INTERRUPTED while loading Image");
      }
                  loadStatus = tracker.statusID(0, false);
      tracker.removeImage(image, 0);

      width = image.getWidth(imageObserver);
      height = image.getHeight(imageObserver);
      }
          }

      Tracker.waitForID(0, 0) never returns. It hangs at MediaTracker line 401
      waitForID(0,0)


          public synchronized boolean waitForID(int id, long ms)
      throws InterruptedException
          {
      long end = System.currentTimeMillis() + ms;
      boolean first = true;
      while (true) {
      int status = statusID(id, first, first);
      if ((status & LOADING) == 0) {
      return (status == COMPLETE);
      }
      first = false;
      long timeout;
      if (ms == 0) {
      timeout = 0;
      } else {
      timeout = end - System.currentTimeMillis();
      if (timeout <= 0) {
      return false;
      }
      }
      wait(timeout);
      }
          }


      Hangs at wait(timeout). Timeout is 0. Can you guarantee that the thread will be
      notified in all possible cases? Apparently not, because It waits and is never
      notified. The whole app then freezes. :(

      In the jdk 1.2.2 version of ImageIcon. Which works fine. LoadImage is

          /**
           * Wait for the image to load
           */
          protected void loadImage(Image image) {
      synchronized(tracker) {
      tracker.addImage(image, 0);
      try {
      tracker.waitForID(0, 5000);
      } catch (InterruptedException e) {
      System.out.println("INTERRUPTED while loading Image");
      }
                  loadStatus = tracker.statusID(0, false);
      tracker.removeImage(image, 0);

      width = image.getWidth(imageObserver);
      height = image.getHeight(imageObserver);
      }
          }

      Notice
      " tracker.waitForID(0, 5000);"
      The thread only waits 5 seconds at the end of MediaTracker.waitForID() before
      looping again. I think this was by design, because there is no guarantee the
      thread will be notified if it enters into an infinite wait. The change in wait
      times is apparently causing serious threading issues.

       For related bugs See bug reports 4226683, 4272382.
      (Review ID: 104414)
      ======================================================================

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              Assignee:
              tdv Dmitri Trembovetski (Inactive)
              Reporter:
              stompkinsunw Sean Tompkins (Inactive)
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