Index: model/org/eclipse/jdt/internal/core/Buffer.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/Buffer.java,v
retrieving revision 1.52
diff -u -r1.52 Buffer.java
--- model/org/eclipse/jdt/internal/core/Buffer.java	30 Sep 2005 10:11:20 -0000	1.52
+++ model/org/eclipse/jdt/internal/core/Buffer.java	7 Feb 2006 01:37:58 -0000
@@ -106,7 +106,9 @@
 		this.flags |= F_IS_CLOSED;
 	}
 	notifyChanged(event); // notify outside of synchronized block
-	this.changeListeners = null;
+	synchronized(this) {
+		this.changeListeners = null;
+	}
 }
 /**
  * @see IBuffer