Added notes about concurrent access to LRUMap.

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@347973 13f79535-47bb-0310-9956-ffa450edef68

project.xml

@@ -129,6 +129,10 @@
       <email></email>
       <organization></organization>
     </developer>
+    <developer>
+      <name>Robert Burrell Donkin</name>
+      <id>rdonkin</id>
+    </developer>
   </developers>
   
   <contributors>

src/java/org/apache/commons/collections/map/LRUMap.java

@@ -39,6 +39,11 @@ import org.apache.commons.collections.BoundedMap;
  * <p>
  * All the available iterators can be reset back to the start by casting to
  * <code>ResettableIterator</code> and calling <code>reset()</code>.
+ * <p>
+ * <strong>Note</strong> as is the usual convention, this map must be protected
+ * from concurrent access by multiple threads for example by calling 
+ * <code>Collections.synchronizeMap</code>. This class may throw 
+ * <code>NullPointerException</code>'s when accessed by concurrent threads.
  * 
  * @since Commons Collections 3.0 (previously in main package v1.0)
  * @version $Revision$ $Date$