JDK-5093922 : NotificationBroadcasterSupport should not use synchronized(this)
  • Type: Bug
  • Component: core-svc
  • Sub-Component: javax.management
  • Affected Version: 5.0
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2004-08-30
  • Updated: 2012-10-09
  • Resolved: 2004-09-25
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Other JDK 6
5.0u1 01Fixed 6Fixed
Description
NotificationBroadcasterSupport controls concurrent access to its internal list of listeners by using synchronized (this).  This is a bad idea since this class is intended to be subclassed.  If the subclass also does synchronized (this), or equivalently has synchronized methods, then unexpected deadlocks can arise.
Comments
CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: 1.5.0_01 mustang FIXED IN: 1.5.0_01 INTEGRATED IN: 1.5.0_01
26-09-2004
PUBLIC COMMENTS .
26-09-2004
WORK AROUND Subclasses must synchronize on some object other than this. They must not define synchronized methods. ###@###.### 2004-08-30
30-08-2004
SUGGESTED FIX Synchronized on an internal object. ###@###.### 2004-08-30
30-08-2004
EVALUATION This is clearly a bug. The fix is simple. ###@###.### 2004-08-30
30-08-2004