3802 : Fields for dynamic references must be volatile

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1613898 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/sling/adapter/internal/AdapterManagerImpl.java b/src/main/java/org/apache/sling/adapter/internal/AdapterManagerImpl.java
index 42a7e66..fb76515 100644
--- a/src/main/java/org/apache/sling/adapter/internal/AdapterManagerImpl.java
+++ b/src/main/java/org/apache/sling/adapter/internal/AdapterManagerImpl.java
@@ -109,7 +109,7 @@
      * The service tracker for the event admin
      */
     @Reference(cardinality=ReferenceCardinality.OPTIONAL_UNARY, policy=ReferencePolicy.DYNAMIC)
-    private EventAdmin eventAdmin;
+    private volatile EventAdmin eventAdmin;
 
     // ---------- AdapterManager interface -------------------------------------