Hi Everyone, Please review the following fix planned for 7u12. It will also go into 8 under 7179482.
Problem: When an AT (Assistive Technology) accesses a Java application with several nested frames, too many property change listeners are added resulting in a severe performance impact for an AT user. The issue is due to the fact that there is an accessibleContainerHandler field in both javax.swing.JComponent.AccessibleJComponent and its superclass, java.awt.Container.AccessibleAWTContainer. When an AT calls JComponent.AccessibleJComponent.addPropertyChangeListener a handler is new'd and assigned to its accessibleContainerHandler field and then the same method in the superclass is called and it also new's and assigns a handler to its accessibleContainerHandler field. Since there are two handlers, when a child component is later added there are two callbacks and for each one the AT will call addPropertyChangeListener, each of which will add two handlers. For deeply nested trees the explosion of events has a negative impact on performance, i.e. there are 2 handlers added for the first level, 4 for the second level, 8 for the third level, etc. Solution: Remove protected field javax.swing.JComponent.AccessibleJComponent.accessibleContainerHandler. Instead, the protected field of the same name in java.awt.Container.AWTAccessibleContainer will be used. Webrev: http://cr.openjdk.java.net/~ptbrunet/7177111/webrev.03/ Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7177111 http://monaco.us.oracle.com/detail.jsf?cr=7177111 CCC: http://ccc.us.oracle.com/7177111
