Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-4132600

exception calling Image.getWidth

    Details

    • Subcomponent:
      2d
    • CPU:
      generic
    • OS:
      generic

      Description

      Name: tb29552 Date: 04/24/98


      I got the following exception trace
      Exception occurred during event dispatching
      java.lang.NullPointerException
       at java.awt.image.FilteredImageSource.startProduction(FilteredImageSource.java:126)
       at java.awt.image.FilteredImageSource.startProduction(FilteredImageSource.java:128)
       at sun.awt.image.ImageRepresentation.startProduction(ImageRepresentation.java:281)
       at sun.awt.image.Image.addWatcher(Image.java:239)
       at sun.awt.image.Image.getWidth(Image.java:132)
              at ncsa.awt.ImageButton.maxWidth(ImageButton.java:462)
              at ncsa.awt.ImageButton.buildMask(ImageButton.java:308)
              at ncsa.awt.ImageButton.<init>(ImageButton.java:266)
              at ncsa.env.presentation.IconPart.<init>(IconPart.java:149)
              at ncsa.env.presentation.UiParticipantPanel.addUiParticipantPanel(UiParticipantPanel.java:135)
              at ncsa.env.control.PacSession.addParticipant(PacSession.java:410)
              at ncsa.env.control.HabaneroEnvironment.addParticipant(HabaneroEnvironment.java:215)
              at ncsa.habanero.Session.readObject(Session.java:338)
              at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:996)
              at java.io.ObjectInputStream.readObject(ObjectInputStream.java:287)
              at ncsa.habanero.streams.FilterMIStr.readObject(FilterMIStr.java:112)
              at ncsa.habanero.streams.SplitterMIStr.readObject(SplitterMIStr.java:162
      )
              at ncsa.habanero.DeferredIO.readObject(DeferredIO.java:602)
              at ncsa.habanero.SessionManager.joinSession(SessionManager.java:1159)
              at ncsa.habanero.Habanero.joinSession(Habanero.java:372)
              at ncsa.env.control.PacSessionManager.joinSession(PacSessionManager.java
      :842)
              at ncsa.env.control.PacSessionManager.runSession(PacSessionManager.java:
      733)
              at ncsa.env.control.PacSessionManager.runSession(PacSessionManager.java:
      678)
              at ncsa.env.control.PacSessionManager.callbackMenu(PacSessionManager.java:441)
              at ncsa.env.presentation.SessionEnv.action(SessionEnv.java:781)
              at ncsa.env.presentation.SessionEnv.actionPerformed(SessionEnv.java:807)
              at ncsa.awt.ImageButton.processMouseEvent(ImageButton.java:640)
              at java.awt.Component.processEvent(Component.java:2129)
              at java.awt.Component.dispatchEventImpl(Component.java:1764)
              at java.awt.Component.dispatchEvent(Component.java:1704)
              at ncsa.habanero.EventDispatchThread.dispatchEvent(EventDispatchThread.java:212)
              at ncsa.habanero.EventDispatchThread.dispatchEvent(EventDispatchThread.java:178)
              at ncsa.habanero.EventDispatchThread.run(EventDispatchThread.java:244)


      (From) examining FilteredImageSource.java, line 126, it seems as though
      startProduction should be synchronized, as the proxies variable is
      being clobbered halfway thru the function.

      Since this is a synchronization bug in your code, I do not know
      how to reproduce it.
      (Review ID: 28855)
      ======================================================================

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              • Assignee:
                Unassigned
                Reporter:
                tbell Tim Bell
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